ATX PC power supply diagnostic and repair.

Рет қаралды 413,298

Күн бұрын

Here in this video I am going to test, diagnose and repair ATX power supply for one desktop PC. The PC went dead after power supply failure. Here we will learn how to test and limit the power supply fault to a particular circuit.
replacement power supply can be found anywhere in the market. switching power supply is the main part of today's modern electronic equipment. power supply manufacturers are everywhere in China. 12 volt computer power supply is very common ATX type supply used in computers, laptops, photocopiers, printers, atox and everywhere. unregulated power supply is another common type of power supply used in most equipment. 24vdc power supply is sometimes used to charge a lead acid battery. pc 12v power supply can be modified as lab power supply. 12v dc atx power supply is common type supply for desktop PC. pulse power supply is another name give to a switching power supply. ac dc power supply is very common for lab use. linear regulated power supply are used as variable voltage output supplies. programmable power supply is another kind of variable voltage power supply. cosel power supply is sometimes used in electronics. best power supplier are most manufacturers. industrial power supply is another kind of power supply used. 12v dc computer power supply can be used as apx power supply. where can i buy a power supply is common question asked. medical power supply is the most costly type of power supply used in medical equipment. switching power supply is another name of ATX power supply. dc power supply is also a kind of switching regulator. ups power supply is termed as uninterruptible power supply. 12v power supply has many many uses.

Пікірлер: 361

@InfernosReaper 7 жыл бұрын

This is the first power supply video I've seen that wasn't just a capacitor or fuse and one of the few videos that actually takes the time to troubleshoot the device. It is very good when people making videos put in quality effort & educate people who are interested in electronics

@JahanZeb1976 7 жыл бұрын

Thanks friend. That is the purpose of the video.

@nadrojrosario9174 6 жыл бұрын

G+ Link: https: kzfaq.info/love/Jb9vF4EHIF_RWyDWrLQT-A Nice Video! Apologies for butting in, I am interested in your initial thoughts. Have you heard about - Saankramer Electronic Magazine System (google it)? It is an awesome one off guide for learning how to repair electronic items like a wizard minus the normal expense. Ive heard some decent things about it and my mate after a lifetime of fighting got great success with it.

@Drekunem 3 жыл бұрын

"I rewound the choke because I had some time to do it, and of course it worked." Love it.

@JahanZeb1976 3 жыл бұрын

That's great and wonderful if you did it perfectly. Hope you enjoyed the process.

@roseelectronics4582 3 жыл бұрын

@@JahanZeb1976 Sir, I think he is quoting you from this very video. You might have forgotten the video but we don't.

@jakese7en1 8 жыл бұрын

Wow, can't believe this guy is giving advice on repairing electrical components. Anyone else spot the two bare wires going into the wall socket behind him? (set video to 1080 on full screen and have a good look) This made my day, I really needed a laugh...thanks.

@JahanZeb1976 8 жыл бұрын

+jakese7en1 You can only laugh and will only laugh. Any thing else is beyond your abilities! Instead of pointing a very small thing look at the subject which is being discussed. I was testing it in an expert way. A lay man was not attempting the repair that you are pointing two wires. A practical man is never ever giving attention to such "Calligraphy". If the video didn't work for you, no worries as the same time it worked for thousands. So instead of doing a negative comment just pass the video and go ahead. Also giving a look to your channel shows there is no single video upload. I am challenging you to upload something of your own better than me.

@jakese7en1 8 жыл бұрын

+LearningZone Actually I am a PC technician, I've fixed thousands of PC problems. Saying that I've never fixed a PSU, so my hat is off to you for that. BUT!!! two bare wires into a wall socket is not a small thing, it's outright dangerous.

@JahanZeb1976 8 жыл бұрын

+jakese7en1 You are right dear friend but as I already explained, here I was the only working on such unit. So I understood the risk. If there were children or ladies around, sure I had to protect it very well. Another thing is PC repairing is not only my job. this is a hobby. And when I am shooting a video, there is much more to do than to give attention to wire insulation etc. There is my other video coming on where I am doing even more dangerous testing. So you will become even angry on that.

@jakese7en1 8 жыл бұрын

+LearningZone I will look forward to that, as long as there is no ladies and children around it should be OK, because we all know men can take 240 volts no problems!!.

@keintabak 6 жыл бұрын

Thank you for your expert instruction. This is the most useful troubleshooting video for ATX PSU, yet!

@JahanZeb1976 6 жыл бұрын

Thanks dear friend for liking. Keep up watching for more useful videos. Best regards,

@EmmnauelPeace 5 жыл бұрын

Very precise and exact the to the point. Thanks Great work, best regards

@RepugnanciaDulzona 9 жыл бұрын

Dude, you're really passionate about the electronic stuff (your job, I'm guessing) and it's always nice and inspiring to see that. Keep up the fine job and thanks for sharing your knowledge. Btw, I just subscribed tp tpur channel.

@5950155 4 жыл бұрын

good vid..to the point..watched it 6 or so months ago...but forgot bookmark..glad to see its still here...took almost an hour to find again...lol

@JahanZeb1976 4 жыл бұрын

Wonderful comment. Great that you liked my video and bear that much pain to get it again. Great people like you must subscribe here on my channel so that you will always be in touch.

@TheArtofHappiness 6 жыл бұрын

Nice channel sir! I've an associate engineering diploma in Electronics too.

@JahanZeb1976 6 жыл бұрын

That's great dear friend. You are so nice.

@nkhjk3457 4 жыл бұрын

"before they were 20 pin now they are 24" , as a kid that grew up with outdated hardware ... i can relate to this so much ... so nostalgic sir ^.^

@JahanZeb1976 4 жыл бұрын

Yes

@tlevergood 6 жыл бұрын

I like the video, just wish you would've shown how to remove/replace both the choke and at least 1 cap. It's nice to see how all the intricate pieces work together. Good job with the oscilloscope as well -koodos.

@Vidya1939 6 жыл бұрын

Well done sir TKQ a lot for video and demo

@moingujjar2003 6 жыл бұрын

Sir wonderful lecture thank you

@TechMafiaa 8 жыл бұрын

thanku for sharing this sir loved your work :)

@darkwaterblue 9 жыл бұрын

Love the bare cables rammed into the power socket at the start. Plugs are for overrated. Nice video.

@govindkatwa558 9 жыл бұрын

Thank you sir.. thanks for your reply sir...

@yannmen8769 3 жыл бұрын

Thank You. You gave to me useful information

@englishrupe01 3 жыл бұрын

Great job! Very cool....thanks!

@mr16ga 3 жыл бұрын

I like your presentation good practical knowledg.

@Neilrrc37 8 жыл бұрын

A switching power supply does require a load to work properly, but you seem have knowledge of this power supply to repair it, Very well!!

@JahanZeb1976 8 жыл бұрын

+Neilrrc37 Thanks dear friend.

@SouthCoastMudlarks 9 жыл бұрын

Most of these can be repaired without even powering on the scope. Its normaly shorted switching transisitors causing a dead bridge, bad caps, blown PWM and diodes. Good video.

@JahanZeb1976 9 жыл бұрын

Dooglesman Yes dear friend you are right. A shorted power supply could be tested and repaired using a regular multimeter but reason for using scope here was to show the short circuit behavior. The acquired knowledge will help somewhere else in future repair work. Regards,

@SouthCoastMudlarks 9 жыл бұрын

LearningZone Thank you :)

@videosagb 8 жыл бұрын

Good job man. You speak very fast but its useful for my English learning. I'm technical electronic too.. Those power supply are cheap and worst for med and high levels PC. I choose for certified power supplies only.

@JahanZeb1976 8 жыл бұрын

+videosagb Thanks sir. subscribe for future videos.

@stephenresquites2629 7 жыл бұрын

very usedfull thank you

@wavyboi94 8 жыл бұрын

lol "capastrus...." Nice video man thanks a bunch!!!

@JahanZeb1976 8 жыл бұрын

+Wavyboi Graphic Thanks.

@tubejim101 9 жыл бұрын

Great video.

@bhushanvelis 7 жыл бұрын

Thanks a lot !!!

@JahanZeb1976 7 жыл бұрын

You most welcome dear subscriber.

@mohammadumarshaikh4586 7 жыл бұрын

thanks for this inf .

@JahanZeb1976 7 жыл бұрын

You most welcome dear friend. There are some other videos on my channel regarding SMPS power supply repair. You may watch those to get into the subject a little more. Regards,

@tbyers31 8 жыл бұрын

Great video. I hope you've made the video on the repair and rewinding of the coil. I'm eager to watch it.

@JahanZeb1976 8 жыл бұрын

I didn't film the winding process but will do it next time for your interest.

@eddieloius4592 4 жыл бұрын

@@JahanZeb1976 Right , i was dissappointed not to see it. too bad. Thanks for the video though

@JahanZeb1976 4 жыл бұрын

@@eddieloius4592 what's too bad? Beauty is in one's eye. Anyhow thank you for watching.

@basheerkhan1656 8 жыл бұрын

VERY INFORMATIVE THANKS KEEP IT UP.

@JahanZeb1976 8 жыл бұрын

+Basheer Khan Thank you for liking video. Subscribe and stay tuned. A lot of videos will come on.

@Sloxx701 7 жыл бұрын

Good lord, the entire input filter stage and input protection is missing from the board in that PSU, they didn't even bother populating it (just a single glass fuse is used). There's no output protection and no PFC which means nasty output transients are possible. And those dinky FETs, output diodes, and heat sinks... 500 watts my ass. I would be amazed if it were stable at 250. I'm surprised only the output caps and inductor died. That thing is a time bomb

@JahanZeb1976 7 жыл бұрын

Maybe you are right. But it worked and is still working in a PC. Everything can be a time bomb!!!

@Sloxx701 7 жыл бұрын

You're a good tech, and it's your PC. I just wouldn't trust it in mine.

@Grenplen 6 жыл бұрын

Your shit is the shit!!!Good job. i tried to replicate your job to a slimline power supply with no success because The burnt choke is located right inside the heat sink of the voltage regulators

@rudilussana9194 6 жыл бұрын

I agree with Dacke and would like to add: the 330µF input capacitances are pretty much undersized. This PSU is crap, I wouldn't trust it either... Nice video, anyway :)

@tlevergood 6 жыл бұрын

Yeah it's probably from 1996.

@juanjoey7159 4 жыл бұрын

Sir, I want to ask, PSU Seasonic, if the switch turns on immediately (without connecting green and black wires), what should be checked? (PSU has been removed from the casing)

@shawnanish9684 8 жыл бұрын

thanks

@amayachannel4517 7 жыл бұрын

Very nice thank you for the awesome video

@JahanZeb1976 7 жыл бұрын

Thanks for liking dear friend. Stay tuned for future videos. Best Regards,

@grantgranite1109 Жыл бұрын

Thanks!

@felixcat4346 7 жыл бұрын

Hi I have a Dell smps that has partial functionality but I dont think it is providing full power. My question is should I be able to short out the 12volt power rail to my multimeter and get the amp rating on the spec sheet. What is happening is when I attempt to do this the supply shuts down. I can do this with 5v and 3.3v but the amp rating is much less than spec and the atx psu keeps working.

@HoneyBadger__ 4 жыл бұрын

Very informative video. Same issue happened to my pc. Its been dead since 4 years. Could you suggest me a good brand 450watt ATX SMPS ?

@tomeberhard74 9 ай бұрын

Would have loved to see how you did the rewinding, and the soldering.

@JahanZeb1976 9 ай бұрын

Yes yes. I'm looking for that power supply and will load that for you. That time it ran the pc.

@govindkatwa558 9 жыл бұрын

hello sir your videos are really nice and clear to undrstand sir.. as im very new to the elctronics i dont have much knowldge.. sir show some more videos on pc smps sir.. how to repair the dead smps sir

@JahanZeb1976 9 жыл бұрын

Govind Katwa Thanks friend for liking videos. Keep on watching even automotive repair videos. You will get the best knowledge from them. Also subscribe if didn't yet. I am shooting videos according my work flow and requirement. Sure there videos will come as I will do more and more work on different systems. Regards,

@khaluongngoc5093 7 жыл бұрын

Looking forward to receiving your feedback soon

@richardnanis 5 жыл бұрын

You should mention and know that most of the ATX power supplies need some decent load to really start up and keep their specs. If you start it with no load it will shut down immediatly and even can be damaged in some cases. The earlier versions 1.0 just need a little load in the 5V rail but the newer ones need more minimum load on nearly all rails separatly. They probably will come up for short time but run instable and can be damaged.

@pranaysao8045 8 жыл бұрын

very useful video my dear friend!! keep it up and upload such type of video. really thanks worth watching it.

@JahanZeb1976 8 жыл бұрын

+pranay sao Thank you very much dear friend for liking video. You know the weight of skill that is why you liked the video. Otherwise there are 30 dislikes out of 355 likes! I don't know what people want to watch and what is their expectations? What I did in this video was an extreme repair where I wound the torrid myself and had shown how to diagnose a shorted component which is mostly a pain in the neck. Regards,

@jay22alco 6 жыл бұрын

I have this true rated PSU that turns on but the thing is doesn't boot that computer, it just turns on the motherboard, CPU fan spinning, GPU fan spinning, keyboard and mouse light not turning on, no beep. I tried other PSU on the same PC and it turns on so PSU is the issue. all connection on every single wire are within the standard, 12v, 5v, 3.3v etc no issue in each connection, PSU fan spins normal. I usually get shocked when holding the CPU when installed in the computer. What may cause this issue and what component to check first?

@michaelparadigm7836 5 жыл бұрын

great job

@JahanZeb1976 5 жыл бұрын

Thanks. Stay tuned.

@phillipmanchannel5771 3 жыл бұрын

that was so nice boss

@engineeringteam2546 7 жыл бұрын

thank you mister for these information , please tell me how to rewind this shock coil at home ??

@JahanZeb1976 7 жыл бұрын

Thanks for liking video. Wind coil with hand, same number of turns in same orientation with enameled copper wire. Regards,

@RIPSAWONE 8 жыл бұрын

Too cool...

@JahanZeb1976 8 жыл бұрын

+RIPSAWONE Thanks.

@meenash6015 7 жыл бұрын

Hey guys. My pc had shut down a few days ago and I narrowed down the problem today. Everytime I plug in the 4-pin power socket on the motherboard for the cpu, the pc does not boot at all (no fans running etc). When I unplug the cpu 4-pin on the motherboard, everything is fine. The fans run at their at their normal speed (led and gpu). Obviously, there is no post since the cpu is unplugged. Did my cpu 4-pin power socket short circuit?

@eltalibmohamed3321 2 жыл бұрын

Thanks, can you make a video of how pc power supply work especially on the chopping circuit and how the bases of the transistors are being driven

@JahanZeb1976 2 жыл бұрын

Yes sure. Soon I'll upload.

@nihadasadli2642 6 жыл бұрын

I would replace that PSU with good one. Bad PSUs destroyed two of my PCs so far.

@ubedlohani 8 жыл бұрын

how to wind that torroid choke coil.. what are the turns specifications and winding directions.

@oilbay54 8 жыл бұрын

+ubedlohani I guess he counted the number of turns and noted the winding directions while unwinding the damaged coil. Since there is only one coil he must've wind it by hand. This was the way that I used to do so many years ago.

@shaikshamsu 9 жыл бұрын

sir thanks for sharing your knowledge your videos are really nice and clear to understated , I just subscribed to your channel. thanks a lot again

@JahanZeb1976 8 жыл бұрын

+shaik shamsu Thanks friend. Keep up watching.

@rj_854 3 жыл бұрын

Rectifier ke liye 2diode RL207 ka or 2diode 1N4007 ka use kr skte h kya sir ...?

@ganeshbhagwat6505 8 жыл бұрын

my atx smps near the main power supply 03 pin socket spark and sound is coming i can not connect the power supply how to check or trouble shoot this

@figueroaernan03 3 жыл бұрын

What capacitors volts and uf types are replaced

@sushilsaxena7038 7 жыл бұрын

very very nice sir

@JahanZeb1976 7 жыл бұрын

Thank you friend.

@abrahamtesema3127 8 жыл бұрын

That is Good & well

@JahanZeb1976 8 жыл бұрын

Thanks for liking and subscribing. Regards,

@Chronox2k4 8 жыл бұрын

Sir what about the rezistors at the output ,is it possible the choke burned because of rezistors ?

@JahanZeb1976 8 жыл бұрын

+raziel x2k They could be but in very rare case. Mostly caps and inductors are going bad.

@ErionDemiri 9 жыл бұрын

Nice work. I know that people can/will find things in this video they will try you to change (like the wires inserted without a plug in the wall and powerstrip) :) but don't worry. I also like the lady voice playing (i think) with the baby in the background. Just like when i try to make a video at home, my baby decides to cry and scream :) My only suggestion to the video would be to give more advise to the people watching, to not try to do this without proper knowledge of the dangerous voltages in the mains and entrance big capacitors.

@JahanZeb1976 9 жыл бұрын

***** Yes you are very much right. Some people are just trying to catch a small mistake and trying to make it an issue. There is one example that flies are sitting only on dirty wound and they just ignore nice and healthy parts of body! Same applies here. Terrorists are everywhere and are trying to lay down others. Your advise is nice and I will apply that in such future videos. Regards,

@sushilsaxena7038 7 жыл бұрын

sir three transistor are used in SMPS power one of transistor has blown off number not tracable other two ransistor which are ok are TT2146 can you tell me the number of blown off transistor

@DoctorrMetal 7 жыл бұрын

Thank you so much - it was very helpful - think I got the same problem with a power supply - also I supscribed to your channel :)

@JahanZeb1976 7 жыл бұрын

That is great my potential subscriber that you are attempting to repair your own power supply. The purpose of the video is to encourage people to get help and attempt their own repair. Regards and wish you good luck with your repair.

@Ncky 8 жыл бұрын

Biggest transformer is for main rails middle size one is for stand by voltage for 5vsb and pwm controler :D and smallest one is gate drive transformer. :D

@JahanZeb1976 8 жыл бұрын

+N!cky Nice explanation. Thanks.

@shahfahad8623 5 жыл бұрын

Please upload more videos on circuit repair

@JahanZeb1976 5 жыл бұрын

Sure. Stay tuned and blessed.

@waydav1s 4 жыл бұрын

TO ALL: There are LETHAL voltages in all computer power supplies and it is MUCH easier than you may think to contact these voltages. The heat sinks in particular can be at floating voltages exceeding 150v! Some capacitors in it are High Voltage and can hold a deadly charge for some time. A "tinker" should think twice about working on these. I have been in the electronics field for MANY MANY years. I have a complete E-lab where I do repair and Fab. (I) got whacked by the heat sinks whilst working on a live supply! If it happened to ME, I ASSURE you, it CAN happen to YOU. A: Use a Isolation transformer. No if's, and's, or but's. You can DESTROY your O-scope if you do not. B: NO bare hand touching with a supply that is plugged in. NO. NONE. C: Wear insulated gloves. Use a ATX breakout box such as: www.amazon.com/gp/product/B01NBU2C64/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1 and a ATX TEE connector like this: www.amazon.com/gp/product/B07BH2XM62/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1 Do you see how close that alligator clip is to the case? These supplies can EASILY deliver 30+ Amps on several of pins. This equals RAPIDLY melting wires if you do not know what you are doing. Also, In the vid, notice those heat sinks? They are probably over 150v relative to ground, OR each other! Please, be very careful. This is NOT a beginner project.

@therider3939 6 жыл бұрын

I changed the termister and the rectifier bridge that was bad and when i pluged one of the transistor and a resistance blew up do you think all the problems was from the transistor?

@JahanZeb1976 6 жыл бұрын

There could be a short circuit in primary or secondary circuit. Test for shorted components. Regards,

@jesussaves6671 8 жыл бұрын

I don't see it in the list of posted videos or do I have to do some extra search(the new vid)

@JahanZeb1976 8 жыл бұрын

+Jesus saves This is the third last video uploaded some two weeks before. The title is Router 9V supply repair. Maybe you will get some understanding from that repair as it is a repair on the primary side of the power supply and also latter in the end of the video I show how to use series lamp testing after your repair. Regards,

@keithcitizen4855 3 жыл бұрын

After I replaced burnt capacitor 5 v standby disappeared , am guessing was not careful enough and destroyed a surface mount component , was a compact PSU with pfc , components packed in like sardines. Since posting this comment I have found a transistor near the standby transformer that has no conductively what so ever so am hoping a replacement will at least bring back standby ,,

@nfz3809 9 жыл бұрын

On pin 13 on the 24 pin atx connector, is the ORANGE +3.3 V wire and the BROWN +3.3 V sense wire basically the same wire? Can i use a BROWN +3.3 V sense wire on pin 13 instead of a ORANGE +3.3 V wire? I'm making a adapter and i only have a BROWN +3.3 V sense wire for pin 13, so will it work just the same as a regular ORANGE +3.3 V wire?

@38911bytefree 5 жыл бұрын

Late, but ..... the brown is IMHO like a remote sensing compensating on cable loss and should reach the connector in your adapter. If not possible, just tied orange and brown, then continue with brown.

@audunjemtland8287 6 жыл бұрын

Someone has warned me to NOT open the CPU to blow away the dust. Let it rest for a couple of hours. As there can be electricity in there? Is it dangerous? How would you go about it? I've seen people hit the power button when it's turned off to discharge.

@laigrimmie6610 6 жыл бұрын

sir can you make video tutorial about motherboard desktop how to test in multimeter and also can you determine about the diode voltage or give me schematic motherboard i appreciate your work and i want to be your student i want to learn what you have....thank you sir

@thesummertune 8 жыл бұрын

Hi, if the capacitors measure 20-30% more of the printed value, they are still ok or it's better to replace them? no bulge etc. on them.

@JahanZeb1976 8 жыл бұрын

Not a must but if they went bad in ESR value, for sure you will replace them. Regards,

@thesummertune 8 жыл бұрын

unfortunately i don't have a ESR meter, thanks for the reply.

@ih271 3 ай бұрын

How did you change induction, my toroid inductor looks black and always heats up, what do i do ?

@ih271 3 ай бұрын

Can you do a tutorial on how to change it ?

@vsurlan 7 жыл бұрын

YOU FORGOT TO WARN PEOPLE THAT THERE ARE POTENTIALLY DEADLY CHARGES IN THE CAPACITORS. Please add this as an annotation to the beginning of the video and in the description. Someone might think it's OK to just pop the PSU open and start fiddling around like it's a harmless toy.

@JahanZeb1976 7 жыл бұрын

You are right. I would do it.

@nickl7606 7 жыл бұрын

To rewind the choke, you just have too get the same number of passes around with a bare copper wire?

@daemoncan2364 7 жыл бұрын

Enameled (Magnet) wire is required.

@JahanZeb1976 7 жыл бұрын

Yes same number of turns, with same orientation. But the wire must be anamelled insulated and not bear copper wire.

@neknosnaws5990 6 жыл бұрын

Sir: Do you have any blown PSUs for Dell Optiplex 745 SFF? I need a connector that is on that supply, to power a dvdrom.

@JahanZeb1976 6 жыл бұрын

I am sorry at the moment I don't have one. But if I would get one in future, I would let you know. Regards,

@KrotowX 4 жыл бұрын

Search Internet for "sata power splitter". And if you have access to old PC parts and soldering iron, you can make your own in 15 minutes.

@AjudaTecnica 7 жыл бұрын

please activate subtitles in Portuguese. Thanks.

@jkd7799Yann 6 жыл бұрын

this psu has 15A on the 12v rail, meaning it can barely reach 250w continuously properly. Even at peak wattage for a few seconds, i can't imagine it will reach 500w. Just to give a comparison, my 400w gold rated psu has 32A on the 12v rail. So, this is a very good video, showing you have superb skills, but i would advice to get another psu because it is of very bad quality and will damage the whole system.

@JahanZeb1976 6 жыл бұрын

Yes you are very much right. This was only for demonstration. Thanks for liking.

@isaiaslafon9329 5 жыл бұрын

Very nice video. I have a problem with a PSU (thermaltake tr2 600w) after low voltage on input AC 220 (160 or less) my power supply Die, but my motherboard show green light when connected. PSU won't turn on even manually with green+black wire together. Do you know what can it be? What can I test? No sign of burnt or smell. Thxs in advance!

@JahanZeb1976 5 жыл бұрын

It seems some problem with your psu. Repair or replace if possible. Regards,

@BavarianM 4 жыл бұрын

I'm going to repair my Powermac G4 PSU since those are kinda unobtainable

@JahanZeb1976 4 жыл бұрын

Wish you very good luck 😘 with your repair. Hope you will bring it back to life.

@dibyajit37 7 жыл бұрын

Which colour you short it to switch on power supply green and....

@jaysoncarias8004 4 жыл бұрын

G and b

@Aslan1666 3 жыл бұрын

Can i use one ground for all voltages like +12v to a boost converter and +5v for lighting led with just one ground cable?

@JahanZeb1976 3 жыл бұрын

Yes sure. But consider current rating. The circuit current shouldn't exceed the negative cable current carrying capacity.

@Aslan1666 3 жыл бұрын

@@JahanZeb1976 i have another question if u help me i will be gratefull can i combine gnd of power supply with gnd of phone charger ?i wanna make lab bench psu with fast charger by 2way switch and volt amp meter to swithc between them

@JahanZeb1976 3 жыл бұрын

Yes you can as long you may not combine positive along with ground conbined.

@TheJavaSync 6 жыл бұрын

More elektronic vids, pls

@JahanZeb1976 6 жыл бұрын

Stay tuned. Soon more video will come.

@skipper1943 5 жыл бұрын

Meri atx k 12v ki bajay 9.5v aarahy hein .kya problem hy??

@lilsea 9 жыл бұрын

주제와 벗어났지만 오실로스코프 브랜드가 골드스타네요...

@irfanjalal2010 6 жыл бұрын

sir plz make one video on hp d530 's power supply

@JahanZeb1976 6 жыл бұрын

When ever will get a chance, sure sir I will do a video or more inshallah.

@danijel124 7 жыл бұрын

I have a power supply. lc power 550w. It wants to power on but the protection circuit powers it off. Ive checked the inside carefully and I cannot see anything wrong. I dont know whats wrong... plz help

@JahanZeb1976 7 жыл бұрын

Sure there will be some short. Check again the secondary and primary circuits for any possible short. sometimes capacitors have dynamic short which is not coming in troubleshooting using ordinary methods.

@OurPhilippineWorld 4 жыл бұрын

I have one just like this in the video.. And me accidentally did not switch from 110 to the 230 volts side. When I plugged it into the outlet here which is 230 volts And now it won't work and I am confused on how to fix it. Not to knowledge of where to start. Not many repair shops here where I am here. Note this not going in a Pc. But a duplicator unit

@JahanZeb1976 4 жыл бұрын

Great to watch video. How did you find it? Useful? You must check components on primary side. Replace defective power transistors, IC, rectifier diodes and big smoothing capacitors. Hope will lesson from you after repair. Stay tuned and sub.

@Bleachanna 8 жыл бұрын

wow that has to be the worst power supply i have ever seen good job fixing it though, i wouldn't use that power supply looks barely good enough for 50 watts

@JahanZeb1976 8 жыл бұрын

+Zachary yes friend you are right. It was an ordinary power supply fixed in a PC. Main purpose of showing all details was to give you understanding of the troubleshooting and repair process. Regards,

@Hamakua 8 жыл бұрын

+LearningZone I enjoyed the video. It was very informative without getting bogged down with unrelated information. Also, I've found the more powerful and "premium" a power supply, the more compact the interior is (need to fit larger more powerful caps withing the same standard space) - so a low watt power is definitely best for showing and teaching a lesson as it's much more clear what everything is.

@38911bytefree 5 жыл бұрын

I have the same problem like the one in the vid. Replaced the burn choke filter and runs like a champ. BUT, it runs very hot, easily 70 degrees (cant touch it). It runs hot even under no load. Voltages are PERFECT. Wondering if the choke will burn again and way ... Could you help me ?. Thanks. Nice vid.

@JahanZeb1976 5 жыл бұрын

Seems you have bad capacitors after filter. Replace those electrolytic capacitors with new. Stay tuned and blessed.

@38911bytefree 5 жыл бұрын

@@JahanZeb1976 Many thanks SIR. Im reparing this ATX to make some money and sometimes I stuck so bad on some of them, can figure out what is going. One question sir, what is the expected freq. The PSU now is at 29Khz and dutyv cycle is 78% (Im using a multimeter with Hz and duty cycle measurement). I changed the set resistor to get 50Khz, now duty is 25% (seem more reasonable). But the toroid is still too hot. I will check caps today. Any other suggestion will be very welcomed. Many thanks and bless for you. EDIT: Added info. Chip is ATX2005, is very similar to SD o SG6105 (not sure if this is the correc number for it) TL494 + 339 combo chips. Its PWM + supervisor. Both inputs work. Input transistor not shorted. Diodes not shorted (at least measuring in the PCB). The choke is for 12V and 5V and -12V. The 3.3V is in a separete choke. It runs hot too, but not as hot as the one I told you. Interesting fact, not sure if you have used this ATX testers (the ones with a blue screen showing voltages and a couple of alamrs), the TESTER ALWAYS have a warning on Power ON delay being 0ms. Normally is 300ms, 350ms .... ummmm It turned off and back on (alone) a couple of times and in one oportunity it took like 3 seconds to start. Thanks again for you patience and time.

@JahanZeb1976 5 жыл бұрын

Great. You have excellent knowledge and research! Hope replacement of output strip caps may help cool down the toroide. Let me know your findings and success. Best regards.

@lostinspaceelectronics870 8 жыл бұрын

Hey my power supply won't turn on at all could you maybe help I can't find the problem?

@HappySlappyFace 8 жыл бұрын

maybe you didnt plug the ground cable? A.K.A yellowgreen

@rpdigital17 7 жыл бұрын

Ground cable is not necessary for powering PSU. You can get electrical shock or damage your oscilloscope through earth ground cable.

@HappySlappyFace 7 жыл бұрын

Maybe the green wire is damaged

@kalle0264 6 жыл бұрын

What about powersupply that had red option (115) volts and then were connedted to 230 v outlet! How do you find the dead resistor or transistor?

@JahanZeb1976 6 жыл бұрын

In such a situation it will make a catastrophic damage to the circuit board. You may test for all shorted components and replace them with good new ones. Regards,

@kalle0264 6 жыл бұрын

LearningZone Ohh thanks, Can you make a tutorial video how to diagnouse circiut board and how to check the components and reglage them?

@jenpau0269 7 жыл бұрын

must problem of power supply when the diode become shortage the mosfet will shortage too then the fuse will Open circuit must 1N5406 , 20N60S1 change it, all of them to become same and new device

@jesussaves6671 8 жыл бұрын

Thanks man. cool video. My Pc's power supply burned recently. I found the input voltage was set to 120 and plugged to a 240 source. I opened the PSU and found one of the two big capacitors on the primary side(640uf 200V) with the adjacent resistor and blue two legged flat component( reads RV) is burned. Can this be fixed or ........ please comment Thanks again

@JahanZeb1976 8 жыл бұрын

+Jesus saves Yes dear friend it could be fixed if you troubleshoot it with patience. Better if you watch my other recently uploaded one video on power supply repair. It will give you some more idea of testing and troubleshooting. Regards,

@zx8401ztv 9 жыл бұрын

Smashing recovery of a quite usable switchmode psu :-)) I think the label is telling lies, it does not look strong enough to cope with the power levels stated, larger heatsinks and a really good fan would have been my choice. But manufacturers love to cut corners :-( I have also repaired switchmodes, but most of them have been dead output capacitors and earlier stage capacitors that prevented correct operation. Another typical problem for old supplys is the standby sub smps, the pc is off but the 5v standby smps can be on for years without a break!!, it dies and there is no primary power to the control pwm chip. I have fed 5v through the the standby 5v line to test the rest of the supply, but later supplys use the standby smps to deliver a second voltage, so i cant do that. The input rectifiers and resivour capacitors can explode, it makes you jump but often its repairable (as long as the chopper transistors are alive). Sorry im rambling again lol.

@JahanZeb1976 9 жыл бұрын

zx8401ztv Again your knowledge is rock! You performed amazing works in your life. Always happy to see your comment. You are absolutely right. 5V Standby power supply is always on to make the PC soft on and off through software way. I experienced trouble with those circuit as well. Some times it is really tedious and time consuming as well as expensive to restore such power supplies. It is recommended to restore them if you have some junk supplies to grab parts from and in other case if the power supply is something special and is not easy to obtain new. Regards,

@zx8401ztv 9 жыл бұрын

LearningZone But like yourself im not appreciated, so any amazing repair is often forgotten by the owner, i dont mind as im used to the effect, im pleased with the repair and may have learnt something in the process :D I have learnt that "Somethings are not worth it, its not because im not good enough." took years to learn this simple lesson.

@BenjaminEsposti 9 жыл бұрын

The other issue with the cheap PSUs not being able to put out enough power is too small of a transformer. The main transformer (the biggest one in the PSU is the main power transformer) gets overloaded, and it "saturates", causing the switching transistors to fail catastrophically. Also, another failure is where a poorly designed 5V standby regulator has a bad capacitor. Because of a poor circuit design, the capacitor failure causes the output voltage to increase, even up to 20 to 30V, frying the motherboard....!

@zx8401ztv 9 жыл бұрын

Benjamin Esposti Ooow ive never seen a standby circuit do that before, but there is time lol. I would imagine the over saturation of the core would create a massive current overload for the driver transistors, booooom!! lol. Ive repaired them but never really looked too close at the technical side. I have a mates pc motherboard with a couple of the mosfets rather ill, well dead lol, for no apparent reason it went pop and the main switchmode was shorted out by the high current cpu psu on board. As there are 4 parallel sets of mosfets and driver chip i removed the dead mosfets, and the mobo works with all voltages correct, any ideas on why it went pop?, everything was stone cold, perhaps its just a crap asus mobo lol.

@Engineer.Critics 5 жыл бұрын

hi its great video i need you little help please must reply. i have codegen atx supply model 250xa1 similar in your video but little bit different in circuitry. suddenly its stop working. every thing is fine no faulty caps no burnt coil, but when i turn on it nothing happened. stay off. but i have 5vsb. what should be possible fault. its schematic diagram available on net u can see the schematic and help me. hope for your positive response sir.

@JahanZeb1976 5 жыл бұрын

Thorough testing is required. Maybe you would have defect in the main smps section. Look for burned components, pcb tracks, loose connections on the main smps primary. On the other hand secondary switching can go defective which is responsible to switch on the main smps primary section. Also check optocouplers in the circuit. Make intense testing to figure out the fault.

@MrTheRishyrichy 7 жыл бұрын

Sir, Would u upload a video how to repair the power supply for Copier IR6000 please. Almost video just showed how to change it.

@JahanZeb1976 7 жыл бұрын

Sure dear friend. But I don't have this particular power supply so that I would try to repair it. If you have one spare and you are able to send it to me, I will try to explain its repair. This will be an opportunity to many more people looking into this subject. Regards,

@nobodyperfect7814 7 жыл бұрын

Could anybody help, one of the pins on my 20 + 4 plug is twisted and I can't plug it in to the motherboard properly

@KrotowX 4 жыл бұрын

Seems nothing so bad that can't be fixed with small pliers and flat screwdriver (or knife).

@gajeragopalonlinee 6 жыл бұрын

Sir mere pass dell t3500 working station he usme jese hi me pc start karta hu to 2-5 seconds me off ho jata he or dekha to psu shot ho gya he to me usko kaise repair karu plzzz sir ans.....

@therider3939 6 жыл бұрын

Mine when i conected to the plug the termister blew up

@JahanZeb1976 6 жыл бұрын

Look for some shorted component.

@Warrior-uk2tx 7 жыл бұрын

Have a power supply only giving 5volts out-put what could be the problem any help

@JahanZeb1976 7 жыл бұрын

If the only standby 5V is available but the supply is not giving output on shorting those 5V to ground, Sure the is some problem in the power side. check for any possible short in the output and input stage.

@xerejuneseve6333 7 жыл бұрын

Cable in braid more expensive than whole PSU . 8)

@JahanZeb1976 7 жыл бұрын

No friend this was not the case for me. The wire have very very less price compared to the whole power supply unit. Regards,

@velanganibabu7071 5 жыл бұрын

Hi, I am using old dell pc smps as 12v 7ah power supply, initially works well. Now the issue is when I connect 12v 35w lamp the smps turns off until it's power on. But VSB 5V power only available and all other turn off. I tried same lamp connected turn on the main supply lamp is glowing and disconnected the lamp n connected again little spark coming and turn off smps expect 5v VSB. Pls help what needs rectify

@JahanZeb1976 5 жыл бұрын

You burned some components inside. They need replacement.

@velanganibabu7071 5 жыл бұрын

@@JahanZeb1976 thanks sir, I found issue in shunt resistor. So I have shorted that its working now.