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Samsung TV , Clicking ? Dead no power ? PFC common fault repair to component level .
Рет қаралды 68,651
Күн бұрынWorth a mention this fault as I have had it quite a few times now on different models of Samsung TV set ranging from a 32 inch to a 55 inch ..
@austingraves3425 Жыл бұрын
I was a TV engineer from '56 and retired just as flat screens were coming in. Its nice to see you repairing down to component level, as we did. Very good video 😊
@michaeldranfield7140 Жыл бұрын
You retired just at the right time then, no money to be made on TV repairs anymore, the CRT days were by far the best.
@lawrencejelsma8118 Жыл бұрын
@@michaeldranfield7140... The problem also is repairing a CRT TV today also. Even having a working digital signal converter to analog signal box, a fixed CRT of say $50 for parts and labor (as a new HDTV of CRT screen size can be $200-$350 in the U.S.) there is risk of further breakdowns of electronic components barely getting by. Even nostalgic computer gamers saying they are spending $200+ in the U.S. on nostalgic old CRT TVs now getting 16+ years old as the beyond warranty last engineering designed day of that TV for lasting longer like a brand new TV. Having to buy a $200 nostalgic 32 inch TV max, 16+ years old, is not worth the risk as figuring out an advantage of buying a new TV of High Definition like this fix on this KZfaq video at hopefully less than $75 in the U.S. as a brand new 55" of this same model is only $369 brand new and with new warranties.
@nightlore000 Жыл бұрын
I used to work for Rumbelows 1974 Service engineer down to component level .. left the trade in 2003. Thanks for posting .. There's not many engineer's now, they're just fitters ..
@michaeldranfield7140 Жыл бұрын
@@nightlore000 the official take is now to just replace the whole board , there are no schematics for these boards .
@myat.oo1oo90 Жыл бұрын
Thank sir.your explain schemetic drawing is very good.
@toolsarecool Жыл бұрын
Brilliant diagnosis, explanation & repair. I’ve never watched any of your videos without learning something new. Thank you for sharing your lifetime of experience here! 🙏
@michaeldranfield7140 Жыл бұрын
Thank you for that.
@markpirateuk Жыл бұрын
Amazing it was just a tiny resistor! Brilliant troubleshooting, as usual, a master at work😁
@michaeldranfield7140 Жыл бұрын
This set was another one of the lucky ones!.
@stevejagger8602 Жыл бұрын
Skimping on a resistor wattage that basically has no value. Thank you for the insight and circuit analysis. This is how we learn - by sharing knowledge.
@michaeldranfield7140 Жыл бұрын
Makes you wonder if it's deliberately done so the set doesn't last.
@stevejagger8602 Жыл бұрын
@@michaeldranfield7140 I think that is very likely - profit drives this disposability.
@dennissmith8199 Жыл бұрын
Michael, you are the TV repair wizard! Great job and video.
@michaeldranfield7140 Жыл бұрын
Many thanks for that.
@philipmnkydusdtbreeze5024 Жыл бұрын
DPRTRD IT AARRRRRTTTT WELL DONE@@michaeldranfield7140🤐
@DaveBrown1 Жыл бұрын
Well done that man, all understood. Inbuilt obsolescence, underated resistor and after 5 years it's time to buy another TV. Great video and thanks for the share 👍
@michaeldranfield7140 Жыл бұрын
It does make you wonder if components are underrated why they used them in the first place , could well be built in obsolescence as you say .
@danmyers7827 Жыл бұрын
@@michaeldranfield7140 Exactly. I would expect that the designers have the necessary knowledge to make the right choices for components. Then there's the CAD software they likely use; that can make the calculations too. I have heard about electrolytic capacitors in flatscreen TVs being deliberately underrated in terms of operating temperature. 85°C fitted where 105°C is needed for a decent service life. When failure occurs after 4-5 years, the TV is thrown away. More turnover for the manufacturer, more waste for the planet. To do things right would cost €1 or less per set, at mass production prices.
@andrew_koala2974 Жыл бұрын
That is how the manufacturers keep their hand in their customers' pocket One could call it the " Electronic Pickpocket "
@angelosanagnostou5550 Жыл бұрын
Thanks Mike, very informative. I had the same kind of issue on a different set, the PFC circuit. When heating up the board with a hair dryer then the pfc circuit started working. I turns out that the little electrolytic cap that smooths out the vcc supply to the pfc ic was high esr. That took me 5 hours to discover
@michaeldranfield7140 Жыл бұрын
I did look at the caps in this set as they were very small and looked like they were designed to have a short life but in the end they were all OK.
@angelosanagnostou5550 Жыл бұрын
@michaeldranfield7140 Can you perhaps advise me on a panel issue? I have a Samsung UA55NU7300K with a failed panel. You posted a video on this but there is a difference I wanted to discuss with you.
@bcu567obzx 2 ай бұрын
Thanks Michael for your you tube fault guide, I have a Samsung with the same clicking noise and replaced the SMD with a 10ohm Metal 1/4 watt resistor and the set works just fine, thanks ever so much for your help, parts cost 85 Australian cents.
@michaeldranfield7140 2 ай бұрын
No problem at all , glad I could help .
@ralphj4012 Жыл бұрын
Well explained and repaired. When you have a spare moment (ho, ho), as other have suggested, it may be worth measuring the drop across the 10R resistor to determine what current is flowing and how under-rated the previous resistor was.
@michaeldranfield7140 Жыл бұрын
Sets already gone back but I can try that next time I get one.
@alasdair4161 Жыл бұрын
From the initial diagnosis there was 15.1V on the transistors emitter, if the PFC chip is expecting 12V the three volt difference equates to 0.9W which seems strange especially as the 15.1V was not a fully unloaded reading so probably close to the correct voltage considering the transistor was also dissipating around 2.4V with the 3V difference from it's collector. Maybe the PFC chip runs higher than 12V nominally but requires it's initial start current to not pull it any lower than 12V (cap charging etc). That could explain the resistor's reason for being there.
@ralphj4012 Жыл бұрын
@@alasdair4161 Indeed, hence the suggestion for a little more diagnosis if another set comes in. We can determine that 900mW was being dissipated (in whatever state the PFC was in) and that is clearly way too high for the original and replacement SM resistors. I suspect (I hope) that when the PFC is running that there is very little drop across the resistor. The issue may be that the designers did not account for a pre-start or PFC failure situation (no design can accommodate every potential component issue) As an aside this in no way diminishes the work that Michael performs (which way exceeds my skills).
@AeroGraphica Жыл бұрын
Could it be the zener that was out of specs, hence the 15v and the resistor eventually failed due to higher dissipation than planned ?
@alasdair4161 Жыл бұрын
@@AeroGraphica They can fail that way. I've even had zeners adopt a strange thermal drift characteristic that makes the fault really interesting to diagnose.
@carlilemike Жыл бұрын
Great video Michael. I noticed the 10ohm res had a zero ohm link in series. Maybe originally they specced two 4.7ohms resistors in series but the bean counters won!
@michaeldranfield7140 Жыл бұрын
Quite possibley and the zero ohm link resistor was much larger!
@diyfixtool830 Жыл бұрын
Your workmanship is great PFC common fault repair to component level
@benben00981 7 ай бұрын
Congratulations mate!! The old skilled technicians are gone!! We have just scrap now.. Appreciate tour video. Very educational for us as young leaners
@michaeldranfield7140 7 ай бұрын
this is a skill that will be lost soon as everything is getting disposable now .
@marksntl7632 Жыл бұрын
Most Excellent Michael! 👍Good to see you again in action 👍Thanks for sharing this with us all! 😎
@michaeldranfield7140 Жыл бұрын
still going but summer time is a very quite time for TV repairs , might try some vintage stuff next !
@omidmahdavi9777 4 ай бұрын
Really great, you identified this problem, your work is great👏
@michaeldranfield7140 4 ай бұрын
Many thanks for that .
@Fastpia 7 ай бұрын
Thank you for helping me. Replaced 10ohm because mine have 48ohm. (100). Tv turn on and works for a day already. No troubleshooting. You are master!
@michaeldranfield7140 7 ай бұрын
No problem , many thanks for watching .
@ElectronPcRepair Жыл бұрын
I love your work pls continue teaching the world. Thanks
@michaeldranfield7140 Жыл бұрын
More videos coming but they wont always be LCD tv repair , I have loads of vintage stuff I need to repair soon .
@ElectronPcRepair Жыл бұрын
@@michaeldranfield7140 sorry for my poor English, but the way you identify and clarify , resolve and teach present is clear and not forgettable. God bless you. Josey
@michaeldranfield7140 Жыл бұрын
@@ElectronPcRepair wouldn't be any fun just fitting a new board .
@Knebebelmeyer Жыл бұрын
i had a similar one few years ago and i tryed hours of hours of toubleshooting and change components,but i was not able to fix it! i was so mad about it, that i dont want to buy a replacement PSU! it was 75$, so not that big, but my frustration was so high, that i refuse to work any longer on this tv! very good job
@michaeldranfield7140 Жыл бұрын
Its not easy trying to find a fault without a schematic diagram but cheaper than a new board , especially when you have the same fault more than once .
@wisher21uk Жыл бұрын
Brilliant Michael, excellent walk through off the repair clear and precise thank you 😊
@michaeldranfield7140 Жыл бұрын
Many thanks for that.
@michaelclutton8446 Жыл бұрын
Amazing repair, I imagine if 100 TV had that fault 99 of them would have been scrapped
@pizzablender Жыл бұрын
I remember these CDs and web sites with repair instructions. "Sony TV chassis xxx turning on slowly with green line at top of screen, remove screw of lip holing PCB at the front, break way plastic lip, re-solder the voltage regulator". That's literally how I remember that. And indeed that fixed it, turned a 3 hour search into a 10 minute repair.
@michaeldranfield7140 Жыл бұрын
A new board would have fixed the problem but that's no fun, first time I had this fault it took hours to fix with no service manual.
@leetucker9938 Жыл бұрын
another masterpiece of deduction .
@michaeldranfield7140 Жыл бұрын
and all with no service manual !
@josephbonello163 16 күн бұрын
love your Work Michael..learnt a lot from your youtube channel
@michaeldranfield7140 16 күн бұрын
Many thanks for the comment and for watching .
@manclt704 3 ай бұрын
@michaeldranfield7140 I used to perform component-level repairs on electronic equipment during the 1970s, and it's wonderful to see that there are still a few people capable of doing this today. Excellent video, thank you for sharing!
@michaeldranfield7140 3 ай бұрын
a good understanding of how these systems operate is useful but the problem with new sets is there are no schematic diagrams so most of the time its more good luck than knowing what your doing, the official thing to do is just replace the whole board but usually this cost more that most sets are worth .
@manclt704 3 ай бұрын
@@michaeldranfield7140 Yes, you are right. Back in those days, detailed schematic diagrams were available for almost all TV models. This meant you didn't have to rely on reverse engineering or guesswork; instead, you could scientifically troubleshoot and fix the issue. Thanks
@michaeldranfield7140 3 ай бұрын
@@manclt704 its very sad the makers wont release any schematics, they must have them from when they design the set on a drawing board .
@nigeljefferies8713 Жыл бұрын
Must be one of the few left that can do such work. Well done and a great video to watch. Nige,
@michaeldranfield7140 Жыл бұрын
I'm sure everyone could do this if there was a service manual available , most manufactures only supply new boards so they no longer publish any schematic diagrams , you have to rely on datasheets from the chip manufactures to give some clue to how something works , its all well and good but very time consuming .
@englishrupe01 Жыл бұрын
Great job, Michael.....thanks for the show.
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@renegeijtenbeek7457 Жыл бұрын
Hi my friend. I have a ue55d7000 and the same problem... Super to know where to look new. Thank you master😊😊.
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching .
@radio-ged4626 Жыл бұрын
Great tip Michael, that's a massive time saver.👍👍👍
@michaeldranfield7140 Жыл бұрын
It's well worth remembering, I have had this same fault quite a few times now on different models.
@oscarmarfori613 Жыл бұрын
9:38 that was clever I never thought of that using the iPhone as a microscope I was already contemplating on buying a dedicated one, thanks for that wonderful idea 👍
@michaeldranfield7140 Жыл бұрын
im amazed how good the phone is , far better than the Chinese microscope I bought which is absolute crap .
@oscarmarfori613 Жыл бұрын
@@michaeldranfield7140 Because of your Brilliant Idea, I will just have to purchase a “phone holder arm” that I can just clamp the iPhone into saves me more money for not buying the electronic microscope, it’s a win Mate 👍🏻 thanks again for sharing your brilliant ideas
@kevb1816 Жыл бұрын
Good vid Micheal! Why on earth didn’t they fit the higher rated resistor in the first place - SMD resistors aren’t exactly expensive and the difference between the 2 sizes must be tenths of a penny…
@manolisgledsodakis873 Жыл бұрын
I've worked in industry so I can tell you the possibilities: 1. one million TVs manufactured and a saving of one tenth of a penny per set adds up to 100,000 pennies or £1000 pounds. It's not a huge amount but if you can do that with several components it adds up. 2. A TV only has to last the warranty period so, if you make it fail after the warranty expires, that's a new TV sale. 3. the specified component was out of stock so someone used the next nearest "equivalent". 4. the original designer didn't bother to do the maths or made a mistake. 5. the resistor was from a bad batch. 6. glue or other contaminant caused the resistor to corrode (not in this case but a common problem).
@austingraves3425 Жыл бұрын
Then we wouldn't have this video😊
@michaeldranfield7140 Жыл бұрын
Given that these was space on the pcb to fit a bigger one this could have been a deliberate act to make sure the set didn't last too long but someone has also given a whole list of reasons it could be.
@stevebabiak6997 Жыл бұрын
@@manolisgledsodakis873 - although I do agree with all of your possible explanations, there is one that might make more sense: the zener diode at the base of the pass transistor is no longer operating properly, and is at a voltage higher than it’s original nominal rating. Thus the voltage at the emitter of the pass transistor is too high, pushing more current flow to the load. A measurement of that zener voltage compared to its nominal voltage should answer whether this is the case or not. If not, then maybe that 10 ohm resistor was improperly specified in the design.
@ianlee487 Жыл бұрын
What a clever guy great watching you
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@Dave64track Жыл бұрын
Just come across your channel that was a great down to component level repair I have just subbed keep up the great work.👍
@michaeldranfield7140 Жыл бұрын
Believe it or not I don't do that many TV repairs these days, most people just prefer to throw them away and buy a new one .
@5pr1nk57 Жыл бұрын
Btw you've got yourself a new sub! 😊 Great diagnosis and explanation and good to see another fellow tech/electronics enthusiast here in the UK! 😊 You sound as though you're from Leicester or further north, Yorkshire perhaps? I'm down south in Surrey 😊
@michaeldranfield7140 Жыл бұрын
No Im from Buxton in Derbyshire , I have always been in the TV repair business but repairs are getting few now everything is so cheap brand new .
@renowden2010 Жыл бұрын
The culprit is not really the 10R but Samsung for not using a component of high enough rating.
@michaeldranfield7140 Жыл бұрын
And given that there was space to fit a much larger resistor it does make you wonder why this was done in the first place.
@waynewayne3709 Жыл бұрын
To save money and get away with it, oh and then sell us a new tv .I stopped repairs on tvs in 2004..on wide-screen sets.. I've done a few over the years but don't have the time anymore.
@michaeldranfield7140 Жыл бұрын
@@waynewayne3709 technically speaking repairing TV s should be very easy now , just fit a brand new board and away you go , the problem is boards are so expensive no one wants to pay , so where ever possible I always look for the fault first , new board is last resort.
@FrankJCarver 7 ай бұрын
I think we have a bit of 'planned obsolescence' going on here. Google planned obsolescence, if you don't know what it means.
@truthreigns7 Жыл бұрын
Wonderful and educational, thank you
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@walker55able Жыл бұрын
Great fault finding Michael
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching .
@-MrDontCare- Жыл бұрын
Good job and well explained troubleshooting.
@michaeldranfield7140 Жыл бұрын
No problem, many thanks for watching .
@558vulcanxh Жыл бұрын
Very good indeed Mike😊
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@Trucam2020 Жыл бұрын
Excellent repair video. Thanks
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching .
@lukasgayer5393 Жыл бұрын
This was absolutely brilliant! I´ve learned so much from your video! Thank you.
@michaeldranfield7140 Жыл бұрын
it might just save you from buying a new board .
@electrolatif 6 ай бұрын
You are genius, i learn new things today. I am so happy 😊 Appreciate
@derekblake9385 Жыл бұрын
Great job, another one saved from the tip!
@michaeldranfield7140 Жыл бұрын
Many thanks for watching .
@TechRoady Жыл бұрын
This was a great learning experience for me thanks for sharing the knowledge.
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching .
@oladunk9986 Жыл бұрын
Samsung uses underrated capacitors in their power supplies. I have see this problem in 19 inch PC monitors to big TV sets. Since back in 2005 when I purchased my first 19 inch flat pc monitor.
@michaeldranfield7140 Жыл бұрын
you don't see anything now with good quality capacitors like you use to in the 70 s and 80 s .
@joseguadalupecadenamunoz6340 Жыл бұрын
Un televisor mas con una segunda oportunidad gracias a esta excelente reparación 🧐
@manolisgledsodakis873 Жыл бұрын
"One more TV with a second opportunity thanks to this excellent repair"
@michaeldranfield7140 Жыл бұрын
Just another of the lucky ones.
@gordonemery6949 Жыл бұрын
Cracking video again ,ive got a sharp tv and its starting to have little glitches whenits warmed up,i think ill let it develop lol before I operate 👍
@michaeldranfield7140 Жыл бұрын
With anything intermittent its best left to develop, you might even find it will throw up another clue where to look if the fault gets worse.
@chuxxsss Жыл бұрын
I love your surface mount resistors box. Where did you get it, please?
@michaeldranfield7140 Жыл бұрын
you wont get one of these now unless you are very lucky , it was made by Phillips back in the 1990s to aid repair of the new Phillips G90/ G110 sets that had just started using surface mounted components , there is also a transistor and diode box which I also have .
@chuxxsss Жыл бұрын
@michaeldranfield7140 Phillips always made good products. They had a calibration lab in Sydney, which we went to very well set up and clean.
@pauldavies6037 Жыл бұрын
A 1/16 watt resistor would be interesting to find out the switch on and running current in that little circuit a design error there !
@michaeldranfield7140 Жыл бұрын
could be built in obsolescence, a trick to ensure the set does not last too long .
@pauldavies6037 Жыл бұрын
@@michaeldranfield7140 Yes any SMD IC or transistor or resistors current ratings are too low will fail
@mpaisensei8728 10 ай бұрын
super amazing skills sir michael new sub here. I hope to learn more from your videos..thumbs up to you
@michaeldranfield7140 10 ай бұрын
Don't get too excited, there is no service manuals for most sets now so a lot of fault finding is just down to good luck , unless you just replace the whole board like the manufactures want you to do .
@WinrichNaujoks Жыл бұрын
wow amazing repair!
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@reacey Жыл бұрын
I did one of these recently with a faulty opto- coupler. Im guessing when you soldered those wires onto the resistor , it partially rectified a defect inside the resistor hence the 30 ohm reading ..iv seen heat from desoldering components temporarily "fix" internal open circuits in components before , must be the thermal expansion of the metal inside causing breaks to become bridged back together
@5pr1nk57 Жыл бұрын
Hi, can I ask if it was the same PSU as here that you found the faulty optocoupler? I currently have one of these PSUs I'm trying to repair and have no V on rails or backlights. The resister that's the culprit here reads ok and I have 15-17V from the Aux winding on the SB transformer so was beginning to suspect the optocoupler? 🤔
@reacey Жыл бұрын
@@5pr1nk57 it was very similar to this psu. Ive done 2 the same board recently , one had a dry joint and one had a bad opto-coupler, it was reading about 300 ohm on one side of it with the probes either way round which is why i suspected it , the other optocouplers all gave similar readings in ohm mode and diode mode . Id just change them all and then you can rule it out .
@reacey Жыл бұрын
@@5pr1nk57 after looking at this video again im sure its the same psu. I first thought the fault was the 7 pin chip on the primary because it was getting warm but nothing else was and there was no output on the secondary . Its a pwm/mosfet ic, i bought one from italy and changed it and it did the same thing which is why i started looking at the surrounding standby circuitry and optocouplers etc
@5pr1nk57 Жыл бұрын
@@reacey I've actually since found the fault! There was a small 2A ceremic fuse hidden under some gunk that was open and it revealed a short on the latter part of the primary side which was 2 Smd Mosfets on the reverse of the board so just have to pick some up now as no stock/donors here :)
@michaeldranfield7140 Жыл бұрын
It could very well be , I have found in the past many a diode that reads faulty in circuit then works perfectly after its been desoldered.
@Jetta-Liner 9 ай бұрын
Nice to see this Video,,,i ve same Problem , n fixed them,,,but i need longer time,,,,thx for learning,,Mike
@Chris558576 4 ай бұрын
Thanks for this, worth knowing as i have a Samsung tv here as a monitor on my pc.
@linedancer111 Жыл бұрын
Really well explained thank you!
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@engineernaeemaftab 5 ай бұрын
Best teacher ❤️
@michaeldranfield7140 4 ай бұрын
Many thanks .
@Swenser Жыл бұрын
Cool bananas. Can u recommend a video that explains well the pfc circuit in a tv
@michaeldranfield7140 Жыл бұрын
Have a look round the internet for { Power Factor Correction } this should tell you what you need to know .
@mixolydian2010 Жыл бұрын
Thanks a lot for the tip, take care.
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching .
@jamescrawford2042 Жыл бұрын
Great job again keep up the good work
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@proluxelectronics7419 Жыл бұрын
On the fiat 500 led leak failure, Fiat motorhomes, same issue. Had a few in for repair, 80 quid a pop, pointer off jobs, no problem.
@CriticalThinker84 Жыл бұрын
Where in the country are you? Would be interested if you could fix a 500 cluster.
@proluxelectronics7419 Жыл бұрын
@@CriticalThinker84 North-east.
@Jason-zh7wo Жыл бұрын
Awesome, thanks for the info 👍
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching .
@OaklynHall Жыл бұрын
Thank you for sharing this interesting and educational video with us. Please may I ask what makes the resistor increase in resistance?
@rpsmith Жыл бұрын
Normally overheating but in this case, probably just poorly made part.
@dimitrismaster Жыл бұрын
Many resistors fail to open circuit,but many fail to very high resistance.
@darkwaxer 7 ай бұрын
Interesting stuff, thank you. I’m currently trying to diagnose a Samsung N87 from 2007. Replaced the caps (well the starter round black ones), no joy. Checked standby voltage and it’s clicking 1.8 to 13v.. standby should be 5.3
@hooperwille 5 ай бұрын
I have very similar situation, did you find the problem?
@iancooper2338 Жыл бұрын
Great job MD! 🙌
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@mistergee2k10 Жыл бұрын
Hi brilliant video, really interesting and informative, what does it mean when a TV powers up but has a dark blue screen? I've 2 tvs like this and want to repair then as they are both smart tvs. Thank you in advance
@michaeldranfield7140 Жыл бұрын
if the sets you refer to with the dark blue screen are made by vestel then its the LCD panel that's faulty , take a look at the video I posted just before this one , the Hitachi with no picture as there is a work around to make set the set to produce a picture.
@mistergee2k10 Жыл бұрын
@@michaeldranfield7140 great stuff thank you I'll shall have a look now buddy
@adalbertus777 Жыл бұрын
Great video and troubleshooting masterpiece, Michael. Thank you for sharing. Can I ask , how much time does it usually take for you to get into the right place like for example in this case?
@michaeldranfield7140 Жыл бұрын
The first time you do it it can be hours, or sometimes I look and cant find the problem and put it to one side and comeback another day , all this could be avoided if there was a service manual with schematic diagrams like there use to be years ago, now you have to look for datasheets on the internet for specific chips to set an idea of how a chip operates.
@adalbertus777 Жыл бұрын
@@michaeldranfield7140 Thank you. Priceless your are so keen to share your findings with rest of world.
@naeemn45 Жыл бұрын
Hi Michael, Nice methodical way of finding the fault. Can you make videos on oled tv?
@michaeldranfield7140 Жыл бұрын
I have only ever had two OLED TV s in for repair and neither customer had them done due to the very high cost of new boards .
@tubeDude48 Жыл бұрын
Nice catch!
@michaeldranfield7140 Жыл бұрын
Many thanks.
@gainmaster1 Жыл бұрын
Keep the content coming Michael
@michaeldranfield7140 Жыл бұрын
more coming but might be something vintage next time !
@rayfiore7779 9 ай бұрын
I have a 55 inch Samsung UN55RU8000FXZA and it has a similar failure. 1) The standby light flashes momentarily when I try to turn on the TV but there is no picture/ sound/ or backlight. 2) The 3 electrolytic caps on The Power Supply Board at the top left ( near the o/p to the main Board) have 'domed' tops. 3) When I unplug the Main Board from the Power Supply Board the Backlight turns on. 4) The Main Board does make a sound at turn on like a 'Flyback Transformer' (but only for a moment). My first thought was that the Main Board has a short that is drawing down the Power Supply & keeping the Backlight from turning on. But the other possibility is that the Power Supply Board can't source the current to the Main Board. 5) Additionally, I disconnected the 3 output cables from the Main Board & the backlight is still not lit. Have you any suggestions?
@rayfiore7779 9 ай бұрын
Bad Caps on the power supply output 470 microfarad 25Vdc
@5pr1nk57 Жыл бұрын
So glad I found this! I picked up a dead Samsung 55" UE55F6500SB to repair and stick in the bedroom. It has has the clicking relay and 2 blinks of LED with no startup fault. Interestingly the backlights don't work when the mainboard is disconnected but there is no voltage at the LED output not at mainboard output apart from SB 5V & PWR On 3.2V. I've been testing and researching all day and am stumped! Can find little about this set or faults online. Your set here uses the same PSU board and I just checked that resistor but it reads 10.7 ohm so seems ok? 🤔 I am suspicious of the PFC section though as there's no voltage on rails other than SB, no voltage across the 400V smoothing caps and the PSU seems in a safety shut off/boot loop. The last point you made about a short in the SB transformer is interesting though, I do have 5.3V in those diodes above but not the aux tap off and everything else dead in the secondary? Any other thoughts?
@michaeldranfield7140 Жыл бұрын
I would take a close look at the SB transformer if the 5.3 volt is present but no other rails , check the primary resistance , in the set I had although the 5.3 volt was present I don't think it was possible to draw a heavy current , however you should still have charge on the reservoir capacitor in between clicks , I think I would be tempted to short over the repay contacts with a 60 watt bulb so you can keep power on to aid fault finding . I think in the set I had the primary winding of the SB transformer had an unusually high resistance primary and when I un wound it you could see where there had been a flashover and the primary wire was broken but the transformer still worked to a fashion as there was a conductive path caused by carbonisation .
@dimitrismaster Жыл бұрын
Sometimes ,especially on some older samsung or lg sets,just resoldering the st by and main chopper transformers solves this issue.Cold solder joints can be the issue of relay clicking and no power on.
@michaeldranfield7140 Жыл бұрын
Dry joints seem to be much more common on equipment using leaded solder than it is now but yes I have had loads of Samsung in the past with dry joints on heats inked components.
@dianeog1 Жыл бұрын
Quite enjoyed that video.👍👍👍
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@Barbarapape Жыл бұрын
A classic example of fitting underated components that sooner or later will fail. We were trained to fault find to component level, today it is just to board level which is very wasteful. What will happen when our generation has gone?
@sw6188 Жыл бұрын
Like you I was trained to component level. If we had even suggested the possibility of replacing an entire board the service manager would have fired us on the spot! These days as you say it's all about being a board jockey. Even I have had to resort to doing that, in a situation where an electrolytic capacitor had leaked onto the PCB causing the high voltage present on that cap to track over the board then start arcing then burned a large hole in the board. It was beyond repair as it was a multi-layer board, so I contacted the company and the solution - "replace the entire board". They sent me a complete replacement. I don't know what the future of electronics will be when we are gone. Very likely there won't be any servicing, people will just toss their broken appliances and buy a new one because they will be so cheap - much like how it is now, except we still have people repairing some things today.
@Barbarapape Жыл бұрын
@@sw6188 This is the way the world of electronics has gone, and consumer electronics has been steadily turning into a throw away situation since the 80's. I can remember asking for a service manual for a Philips radio cassette to be told that there wasn't one or any parts stocked to repair it, if they failed under warranty they just replaced it. One option is to make the items self repairing, once the last of the good circuits have blown , then it item is scrapped. I first came across this technology working on the Euro Fighter, they had three backup circuits for the critical controls when i pilot reported a fault we just ran some diagnostics and replaced the faulty module, but not the faulty component. This is all paving the way for everything going AI, then no one will be needed!
@5pr1nk57 Жыл бұрын
I'm in my early 30's and like to fualt find at component level rather than just replace boards. Learning all the time! :)
@sw6188 Жыл бұрын
@@5pr1nk57 Good way to go, it will stand you well in the long term.
@Barbarapape Жыл бұрын
@@5pr1nk57 A skill well worth having, spare boards are not always available, but components are easier to find.
@BjornV78 Жыл бұрын
Who knows how many TVs were thrown out just because of this faulty little resistor. I also noticed that the voltage over the 450V caps was very fluctating, is that normal ?
@michaeldranfield7140 Жыл бұрын
it should be reasonable stable , it could well be me holding the probes as well at the camera .
@Hilbohead 2 ай бұрын
I'm a year older than you and remember reading Everyday Electronics and ETI as a great read! I have a Samsung UE32T4307AK (so a single pcb, newer gen.). I was interested if you had had one to look over yet? This one doesn't power up, but the front telltale LED is on for about 5 seconds, goes off fleetingly, then straight back on, over and over. The PFC route sounds interesting! There is 331v across the main cap. There isn't an S3050 PFC chip that I can see, but there is a 4801A chip, which does have 13v going to it. There are loads of similar, working spare boards on eBay. I think there is a lot of demand! Maybe the panels die early and these TVs get broken for spares? A briefly-borrowed pcb from an identical neighbour's TV fixes it completely. Do you know if this is a 'standard' problem, hopefully with a 'standard' easy, fix! TIA Great videos, BTW!
@andreaslundstrom5743 Жыл бұрын
Good work thanks for the tip
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@andygozzo72 Жыл бұрын
hmm if 12 v at the pfc chip, and output of the transistor is 15v, that means 3v across that resistor, meaning 0.3amp through it, 0.9w dissipation , ?! no wonder it fried! did you measure the actual working voltages at the pfc chip?
@michaeldranfield7140 Жыл бұрын
I didn't measure the voltage at the chip which was a mistake but some chips have an internal zener diode on the Vcc so this may account for current draw .
@Solder_it 2 ай бұрын
Thank you very much! Subscribed
@Flexible_Ketchup 2 ай бұрын
❤ Great job brother 🙏
@paulsanderson8804 Жыл бұрын
Excellent video Michael as per usual what would you say causes these resistors to fail would you say heat has a part to play?
@michaeldranfield7140 Жыл бұрын
I think the resistor fitted was far too small and there was space to fit a bigger one, I wonder if it was designed to fail in the first place.
@paulsanderson8804 Жыл бұрын
@@michaeldranfield7140 I think manufacturers should not be allowed to do these tricks shame on them
@exittech1282 Жыл бұрын
nice work
@michaeldranfield7140 Жыл бұрын
Many thanks for that
@richb419 Жыл бұрын
Hi Michael, do you think the resistor was sized for a fusible link? more than likely it was selected to shorten the life of the TV ( engineered obsolesce) Rich
@michaeldranfield7140 Жыл бұрын
Could well be built in obsolescence and deliberately designed to fail , not easy to find the first time I had this fault as there is no schematics for most sets now .
@ppdan Жыл бұрын
For those wondering why a "100" marking is 10 Ohms. ABC -> AB . 10^C (so C is the number of 0 you have to add to the first 2 digits) 100 -> 10 . 10^0 = 10 . 1 = 10 102 -> 10 . 10^2 = 10 . 100 = 1000 = 1k 476 -> 10 . 10^6 = 47 . 1000000 = 47000000 = 47M
@michaeldranfield7140 Жыл бұрын
I always assumed 100 was 10 plus another zero same as capacitor marking but thankyou for the explanation .
@genenomidic1393 8 ай бұрын
Came for the chips, stayed for the fish 😂
@turboslag Жыл бұрын
Just shows, experience counts! Michael, where can I buy that smd resistor selection box, and is there a capacitor version?
@michaeldranfield7140 Жыл бұрын
Yes there is a capacitor selection box also, I very much doubt you will buy one of these now though, these were produced by Phillips for repairing the G90 and G110 sets of the 1990s.
@turboslag Жыл бұрын
@@michaeldranfield7140 That's a shame, ah well, thanks anyway Michael. Really interesting to see component level repair like this, and good that the set was saved from a premature end👍
@michaeldranfield7140 Жыл бұрын
Keep an eye on e bay with so many shops closing down you may come across one .
@ramirez036 2 ай бұрын
I have the clicking on my samsung, the on/off light flashes 2x 5 times with a longer pause. I'm gonna follow this troubleshooting and see if I have the same issue.
@shothappens548 6 ай бұрын
Great work!
@drakepirate 6 ай бұрын
Hi, Excellent video. I have Exactly the same behaviour on my Samsung TV UA55D6400UJ but when I disconnect its Main board from the Power supply board it stops clicking... So I assume The problem could be at the Motherboard?
@TermitesRGood1 Жыл бұрын
Samsung makes to easy to Diagnose their TVs,If you disconnect Main board and it Turns on its your Main board Replace or fix if you know how if it still doesn't turn on its your Power board .Theyre the only ones that do this in the industry Cheers :)
@michaeldranfield7140 Жыл бұрын
That's the only good thing about Samsung but you still don't want to jump to conclusions, in this set with the main board disconnected the backlights were flickering which might lead you to think the backlights were faulty when infact it was the PFC not running .
@ElectroPassion-wl8ts 2 ай бұрын
Great Job !
@TerryDeSimone Жыл бұрын
This video is ALL the information i need for a 60 inch Samsung... but the video is blurry.. you didn't show where these components were on the other side of the board, and where that lil resistor was even located, in what area..
@michaeldranfield7140 Жыл бұрын
you have to download the datasheet for the pfc chip and then you can trace it back from there .
@BlondieSL Жыл бұрын
NICE!
@michaeldranfield7140 Жыл бұрын
Many thanks for that .
@DADEMANA Жыл бұрын
tanx u papa
@michaeldranfield7140 Жыл бұрын
Many thanks .
@ElectronPcRepair Жыл бұрын
Thanks 🙏
@michaeldranfield7140 Жыл бұрын
No problem , many thanks for watching.
@weerobot Жыл бұрын
Cool..
@michaeldranfield7140 Жыл бұрын
Many thanks for watching .
@ericbraman 17 күн бұрын
Is there any way I can DM you directly sir? I've got a late model Samsung q60 model TV with similar behaviors to this television. However, it is an edge lit strip. The entire LED strip seems to be strobing on and off. If I disconnect the leads to the white LEDs, the blue LEDs come on. If I try to connect both the blue and the white, the strobing starts again.
@marializianichols648 Жыл бұрын
A simple switching pathway became complicated... I'd use a simple method to do that with the opto coupler and 2 tiny MOSFETs without zener diode without resistor .
@michaeldranfield7140 Жыл бұрын
made even more complicated by not having a schematic diagram.
@zaid30000 Жыл бұрын
Thanks Michael for your videos. I have two Samsung 70 " tvs same model. Both have the same fault, main board. I usually buy parts for what I need, but unfortunately I couldn't find the matching one. My question is, are you able to fix these boards? If so is there a better way for communication? Thanks
@michaeldranfield7140 Жыл бұрын
there is no schematic diagrams for most LCD sets now so most fault finding is just a matter of luck , ideally you will need a working board to take comparisons from .
@spazmochad Жыл бұрын
Did you buy a lens for your phone to enable the microscope? Are you able to solder using it? 😮
@michaeldranfield7140 Жыл бұрын
No lense, it's just a £200 Huawei phone, the picture from the phone is 10 times better than a cheap microscope thing I got from China.
@spazmochad Жыл бұрын
@@michaeldranfield7140 That's really useful. I bought an expensive scope but it's still sat in the box. As a hobbyist I just need to have a better view occasionally and just can't face setting it up 😁
@michaeldranfield7140 Жыл бұрын
@@spazmochad I really need a better way of magnifying but cant justifie spending a lot of money when I hardly do any repairs now .
@dimitrismaster Жыл бұрын
I have a question about this pfc .SInce a rectified voltage is Ac X Sqr2, in our case its 230 X 1.414= 324 V dc.What boosts further the dc voltage to almost 400V DC ?
@michaeldranfield7140 Жыл бұрын
It's the power factor correction circuit that boosts up the rectified mains.
@dimitrismaster Жыл бұрын
@michaeldranfield7140 there must be a coil for a boost converter that I did not notice.Or a winding on the main chopper?
@michaeldranfield7140 Жыл бұрын
@@dimitrismaster correct , there is an inductor .
@stevekim3922 Жыл бұрын
Hello Michael, I like to know you have Philip chip R storage bin (container) in video. I like to know where I can get those organized Chip Plastic Bin. Please let me know. Thank you.
@michaeldranfield7140 Жыл бұрын
Someone else asked the same question , this kit was made by Philips to aid repair of the new G90 and G110 sets of the 1990s which were one of the first sets to used SMD components , so its getting up for 30 years old now , the only place you are likely to get one of these is on the internet where someone has closed a shop and selling all the old kit off ., I also have the transistor and capacitor Philips kit .
@stevekim3922 Жыл бұрын
@@michaeldranfield7140 Wow! 30yrs Old Product. You has been keeping and clean used it. Thank you.
@petrosmpampalis6097 3 ай бұрын
Michael, i have this problem with my 40 inch Samsung tv: I power her and after 5 min, she is dead! I have to take off the socket and then to wait 3-4 minutes begore i plug her again: She is ok for 4 - 5 min and then again dead!! I do this procedure 4 -5 times and at the End she is ok!!! But if i close her and open again in two hours, it happens the same!! And i have to do the same procedure once more! Any ideas;🙄 model:LE40B651T3W,made in Slovakia Thanks,
@michaeldranfield7140 3 ай бұрын
Sounds like it may be a dried out electrolytic, you can check for this by warming up the caps with a hairdryer but also check the PFC voltage is not too low
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