I find what you did was not only easier and a time-saver, but economical and practical as far as the customer was concerned. A quick and inexpensive repair - another one working.

Great video. I appreciate you taking the time to post this. A huge time saver knowing how to test the strips without tearing down the entire assembly! Thanks 12voltvids!!

I love to see stuff repaired instead of being thrown away.

Another great video. I like how you challenge these other techs when they start talking crap. Most of them can not back up there statements but you certainly can. Your hard work is greatly appreciated..

I fixed my UA46F5000 thanks to you! I had a single defective LED just like you had. A simple jumper fixed it like a charm.

Great video! I had my own TV shop from 1976-84 in Michigan, but never worked on the LED/LCD TVs before. Another problem with over driving the LEDs is permanent screen burn from stationary images. I know, because I created that problem on my 65 inch Samsung LED TV. Using the "dynamic mode" constantly caused large dark areas on the display. Thanks again for sharing this video.

Good fix. Last time I had to fix one of these Samsung TVs, I had quite a hard time. There was no datasheet for the LED backlight driver IC, and I couldn't find schematics anywhere. Turned out to be the red glue under a SMD resistor. It became somewhat conductive and was throwing off a transistor bias, causing the PWM coming from the main board not to reach the driver IC. Without that signal, the LEDs stay off.

Dispite what some people are saying about your repair methods, you're doing what the client requests. I'll be attempting this repair on a Samsung TV soon, (my intial diagnosis was a faulty T-con board, this video has set me on the right path). Great video

Extremely informative video, all steps and proper procedures were documented with clear instruction, thankful to have come across this video, just picked up a 55 LED Samsung with a backlight issue, hoping to put my soldering skills to the test! Thanks!

Thank you for this video. I was able to revive a broken TV by bypassing two burnt out LEDs.

Awesome video. I didn't even think about jumping the LED. I was about to just replace all the strips and get a new board if I had to. Thanks

Love this video. Thank you. Managed to fix my dads old 32" that he was going to trash. Now i have a 32 inch computer monitor.

OUTSTANDING! One the most professional, step-by-step, yet succinct repair videos I`ve watched. I repair a tremendous amount of electronic and mechanical devices and found this one particularly helpful. Thank you kindly sir!

I really liked your video. You are really knoweledgeable i appreciate the fact you have taken the time to share it

Just picked up a Samsung tv with the same problem. This video has definitely helped and no doubt ill be able to fix it now. Seems like a common fault. 👍👍

Great repair! Great advice on the backlight settings.

All things considered, this is an appropriate repair for this situation(waitng time, cost,etc) and it seems that no matter how often you say it, some people just don't get it! Dave, you have a lot of patience giving the same answers over and over, that would drive me bonkers.

Thank you repaired my son's tv quick and easy by watching your video 🙂

You helped guide me in the correct direction for fixing a LED TV. Thank you for this video very nice of you to share what you are doing.

Refreshing to see you keep the heat on for a good few seconds when soldering. Just picked up a 46in Smart Samsung and have found 2 failed leds in the same string. Now its time to visit the TV shop and see if they will give me a few strings from a S/H parts box. I can just hear them now... Sure, that's $50.00 thanks. lol.

A cheap repair that can literally save people hundreds or possibly thousands, bridge out the dead led with a few cents worth of wire and solder, it's a shame so many people would just throw the set away. Great repair as always.

Awesome video as always

Well done. Helped me resolve an issue with mine. Thank you for posting.

Fascinating! Hadn't seen the inside of the backlight assembly before.

Great repair, i could not see any dark spots, plenty good enough for a tv :-D. Leds do seem crap for that job, but i've seen quite a few cfl backlight monitors that lose a tube or even the h.v driver just dies on one output. Leds do seem to die far too early thought.

Maraming salamat sir.. Galing mo... Tnx..

You're right about not using the backlight for 100% full brightness! I use my Samsung Led TV with 10 out of 20 backlight brightness. And even with that setting it is stillbright enough! I even think all of my settings are just set in the middle. After 8 years, the TV is still going strong!! Indeed a good tip everybody!! Sorry for my bad English...

Brilliant diagnosis and repair video.

Thank you so for your technique LED repair and Troubleshoot Save me time and my TV work again

Nice video informative and to the point , also good job on pest control methods here noted also . Thanks

I know this is a few years old, but just wanted to say that when I replaced the LED strips in my Samsung, I used thermal tape to attach them to the metal back in hopes of dissipating more heat to hopefully longer. Over a year and so-far, so good!

Thank you for this video!

i see this a lot in new tvs. I agree if you turn them down to 50% or below they will last longer and possibly never fail

Originally, I watched your videos to learn some basics and have been successful fixing all kinds of stuff. Now I find myself watching you fix thing I could care less about. Officially, Im addicted to this channel. Does anyone know a good support group?

Thank you very much solder the power supply board and everything's working again I thought I was going to go all the way to the back lights I've bought an expensive tester at least I'm ready for the next repair once again thank you 55 inches is going into my bedroom now once again thank you

Thanks for the educated movie. I have one question please: What would be the cause for one stripe of LEDs to work not on full power ? The picture on the top part of my Samsung tv shows but looks dimmed or darker Thanks

Great vid , Thank you.

When you connect the 50V to test the leds, do you set current limiting on your bench supplies to keep from smoking the leds? Or is there something downstream that limits the current? Great vid BTW. I have a ~2011 Samsung 55 incher and the right half of the screen is dark, so I suppose the led arrangement is different for that model. I will find out when I take it into surgery.

One thing that slightly confused me is when testing the strips individually before tearing it all apart, you used 50V as source voltage. When removed, you used 30V. Does it really make a difference except for how bright it will get?

Sir,Very usefull thank you

Nice simple repair. I did wonder about bridging the dud LED, but given the number of 'em in the circuit, and also that you've turned the backlight down somewhat, it should outlast the tv. Probably can't get the LED for love nor money either :-)

Very nicely explained. Thank you so much.

I saw another video where, after changing the smd led with bad results (burning again) he decided to jump the burned led with an old fashioned led THT. What do you think?

Great video! Nice repair! I can tell you know you way around a circuit board!

These new tv's are not lasting very long just over 2 years old not good my plasma is 7 years old and still going strong. good fix though dave you saved another from the landfill.

excellent video bud....

I guess you went where not many TV repairmen go because I think they don't think it's worth fixing them. You've just proved them wrong. You've absolutely taught us so much. Now If I can remember those voltages, I'll be fine. I like the way you isolated each backlight. Are the backlight strips that expensive? Missing one isn't so bad. You made it look so easy but I know the experience you gave yourself and us it well worth the time. The reason people throw them away is because they don't know how to fix them, they don't have the money to fix them, they've been told that they're unfixable by a lot of TV repairmen. Plus, if the repairmen have to dig that deep, they are going to charge people an arm and a leg. Just a heads up on copyright law. If you have a business, you come under the fair use law and you can use the KZfaq feed for up to 30 seconds with any flack. Only if it's for your business for testing purposes now.

Excellent job appreciate

Awesome! Thank you very much.

Thanks for sharing this vide , I have same tv with 3 led were not working, i replaced the led bulb and all the leds were working, when i put the led strip back, As soon i connected the led connectorsame led bulb blow again. Do u think someting to do with power supply? Can u kindly help me with this. Thank u.

Thanks for sharing👍

A real backlight tester works really well, and they are dirt cheap. Mine has saved me hours of fiddling. They automatically adjust the voltage, and can be used for single LEDs or entire arrays. No jumpers, bare wires or alligator clips required. Also, the most common failure after repair is another backlight going bad, even after adjusting the backlight brightness down. Replacing individual backlights is not recommended because other backlights that may appear to be working perfectly can still be damaged and fail within a month. We always recommend replacing all the backlights as a kit. If the customer insists on just replacing the one failed LED, we only offer a warranty on that LED, and not on any of the other backlights. People have brought their TVs back up to three times before finally saying they will just purchase a new TV when, if they had of done it right and replaced all the strips their TV would stay repaired.

Great video thank you

can I use wires from some earbuds to skip over the broken LED? And can I make a proper connection with sautering?

Could you probe the lighting string connector and check resistance or continuity rather than sending voltage down it? I don't have a bench power supply.

Thanks great video !

Excellent job, thank you!

thank you very good video

Are you able to use the LED tester to check all of the backlight LEDS from the connectors that plug into the power supply board? I took my TV apart again and took the panel outside and held up and looked through it using the sun as the light and I did not see any damage. I just do not understand why the backlights do not comeon. When I checked each tv individually they work. but, Idk how to check to see if they work as designed . I called Hitachi but they are closed today

Hi 12voltvids, thanks for the great video on showing us how to fix the no black light problem. I have a led tv also with no black light problem. But it is with a curve screen. Do you have any experience and/or suggestions in how to handle the screen? I am afraid it will break when I try to take it out before checking the leds.

Really good video...

I have a Samsung UN65H6203AFXZA Version no. MH01 that has had a new powersupply installed, but the same problem is still there. The red standby light is on full time and you cannot turn the tv on or off, no response with the button or remote. Where would you start looking for the problem? I'm very techincal and have repaired a few led tvs in the past. I hate to throw away a 65 inch 2 year old tv if I don't have to. Thanks!

@7:17 Aren't we glad that our power supplies can handle temporary dead shorts? Fun stuff.

Nice job. Thanks for the information. I'm looking at one (Samsung UN40H5003AFXZA) that the 150 volt LED supply won't work with the LEDs plugged in. I put 50 volts on each LED section, and two started bright, then went out. The last one works and according to my meter pulls 50 mA. The other two appear not to draw any current. I'm still suspicious of the power supply although I've found no "smoking" gun 🙂. Even though the two don't appear to pull any current, the power supply still fails when the LEDs are plugged in. Hmm. I like that you actually troubleshoot things. :) Okay (8/28/22), I replaced the LEDs and the power supply works. I would strongly recommend against placing 50 volts on any LED strip. I would start at about 24 volts, and sneak up on it. At about 3.2 volts, this type of LED is pretty close to maximum brightness, so for 13 LEDs, that's 41.6 volts maximum for 12 LEDs it's even less. There is a 150 volt supply for the LEDs (it measures closer to 180). What you may have missed is that Samsung put a [switch-mode] current regulator in the LED strips' return path, and it runs at about 25 % duty cycle. I measure about 103.5 volts across the LED set when operating. This works out to about 2.72 volts per LED, which makes sense. Thanks again for the information and video. I'm not convinced this one has adjustable brightness.

Ohhhhh buddy. I'ma about to make a lot of money. I have found about 7 TVs just this month. 5 worked and 2 were smart TVs with the backlight not functioning. Sold the 5 other tvs for cheap because they weren't smart TVs. 1 70" smart TV and a 40" smart tv both with back light out are about to get died and sold for 150$-250$ minimum on FB market place and/or offer up. This video helped me out a lot!!

Hi there. Thanks for putting together this video. I have a u5002 with low backlight emits about half of what it used to be. Yes, I have running it at 20 to compensate for that. Is there a way to adjust it back up again? I thank you for your reply in advance.

Best replacement video for backlights.

Could a resistor or diode be used instead of a straight jumper wire? Maybe a 3v Zener diode? To keep voltage drop across each led relatively the same to not stress the other leds? Just curious in terms of longevity

i have the bn44-00775a board for the 60in. No backlights, replaced them still no backlights. Old ones just flashed off and on nonstop with several burned out. New ones check out fine but no backlight when i get them into the tv. I have picture and sound. Measure 12.3Vdc to main board but 380-400vdc to the led d+. Legend says it should be 326v. Any ideas what to try next?

I liked when they had Plasma screens. They lasted years. I still have a 12 year old 50 inch Plasma screen and its never had a problem

Whenever I got the LED TV set that the panel is cracked (For instance, the 2017 Element ELEFW195), is there a way that I can make one as a ceiling lights to light up the room?

Remember the phrase, "getting the bugs out?" Got him out at 11:01. When I worked on TVs back in the late 60's, a lot of them were still using vacuum tubes. I'll never forget one TV I opened up and 100's of cockroaches started running away. They probably liked the heat from the tubes and enjoyed eating the paper on transformers and the wire sleeves. Disgusting, I made sure to bill the customer for a can of raid. When I change my LEDS, I'm going to use a heat gun to soften the double sided tape and avoid tearing the diffuser. Might also be able to heat it again to reattach.

Thanks for the workshop. Question when you jumped with 30 watts on damaged element, what source did you jump from? Good element jump the bad?

How many volts are LED's commonly used in TVs? (Specifically Samsung 60") I guess what I mean is what is the voltage specification for a single LED? I've spent the last 2 days watching about 50 videos on the subject. This is the best one!

Hi, what can I do, If I do not have external 50 V power supply? Thx!

Great video

Love the cat intro :)

I have the same issue with my Samsung tv and we've only had It for a little over a year. Is this repair expensive?

nice tv and repair

Good vedio thanks

Mine was being fixed supposedly but when they put the new backlights it was burned again. The damage before was that half of the side of the TV has no backlights functioning. Now when they put the new ones it got burnt. Should this be between the main board and power supply? Please answer please please please sir.

What a great video

Good job.....

I have an 55" Vizio LED 4K TV it's not bad it's a P series model with 125 local dimming zones it's pretty good for an non OLED TV. I never keep it at full brightness for two reason one I'm in kinda a dark room and full brightness would kill my eyes and two you don't need to watch on full brightness. The TV I have has three presets Low Medium High Off I usually keep it at Medium and is good. You can also adjust it your self if you click the preset to Off. I keep it at 75 it can go to 100 but just seems too bright it's nice these sets can get bright but that's to strong for my eyes.

I have model LC50LB26IU and the Tab Boards seam to be hot glues to the base.Any ideas sir

Very good

Thank you Sir!!!

Greetings, Thanks for the Vid. I have a HiSense 55" Roku TV It shut off the other day and would not turn back on. The standby light turns on when plugged in then dims and flashes once goes black for a couple seconds this sequence repeats continuously. I replaced the power board. Same issue. I measured the power from the USB port and the USB power seems to cycle with the light sequence. as if the TV is rebooting. Any ideas ?

Fixed it.. thanks ! What a bad design ! Today even christmas lights don't fail anymore if one single LED is faulty !

Thank you for the very informative video. Does flickering on one side of the screen also indicative of bad led backlights as well? My tv initially had flickering on on side but after about 20 minutes the flickering would stop. The side that was flickering would be darker. Now after the flickering stops, the picture remains very dark. I would hate to see another tv just going to the landfill but is there another test for cause of flickering that can be done?

As per your video I can see the logo of samsung through flash at the time of turning it on. I have a Samsung Led Tv 40 inch which has edge lit strip inside. I have checked the power supply board which has +led,nc,nc,-led which is connected to the edge lit led . The output voltage I can see is 89.9v from the board but the led strip is not turning on. After led drop the voltage is around 68 volt. I have tried power each led through a 9v battery and every led is turning on. How should I get it repaired ? please help.

Hello...is there any way to glueing back a LED lens? I broke one off....tried a glue gun and....it appears when I start the TV

Thank you! My two-year old Samsung QLED went out just out of warranty. It is going bright/dim/bright/dim. Now I know that this is the backlight going out (I'm no computer tech), and I had the brightness turned up to high. Bought a Bravia to replace it, but wondering if it is worth repairing the Samsung?

Thanks a lot, I was able to fix my TV, just an hour of work, no need to wait weeks for new LED strips from china and you don't even notice the lack of one diod

I have this problem with my tv and I need your help

Would it not be easier just to run a resistor across the bad led? I'm having a similar problem, just about ready to test leds, I have power at driver, changed main out but I also have no screen menu on flashlight test and no chime.

I have samsung syncmaster 2253BW ...I hit power button and the picture appears fine for about 2-3 seconds and goes away. Turn off power and hit power again and picture is back again for 2-3 seconds again Any ideas? I'd really like to save this monitor cause its a double monitor setup and would like to keep them paired ;-)

Great video man...very helpful, including the part where you hooked up your 2 bench power supplies in series to get the 50v. On a related side note question...I'm a bit new to this....could a set of 3 9v batteries hooked together in series be added in series with a single power supply to reach the same 50v output for testing the lights? Or would that just blow the batteries?

I wish mine only had one LED out. I got the TV for free and decided I'd replace the individual LEDs instead of buying new strips. Start to finish took about 3 hours. Once you get into a rhythm with a hot air gun and some solder paste its not that bad. Cost me $12 and 3 hours.

I do not see the bad connections that you are talking about.. I creased and tore my reflector that was on the back of the TV and i do think you are able to see it when you get the TV back together. It was stuck down with double sided tape. This panel will not last long with this jumper in place because most likely the existing LEDs are already being over driven by too much current and the jumper will just make the current be higher for the remaining LEDs. You only made one connection from the good led bypassed over the bad LED?