TCL TV No Backlight Diagnose and Repair (GIC55LB111/GIC55LB112) 55S405 55S421 43S4 50S4 

Thank you kindly for this video. I was able to repair my smart tv in under 2 hours. **** 1 word of caution for the newbies***** When cutting the reflective material surrounding the LED back strips be sure not to cut through the tiny wires/connectors that power LED back strips. Thanks again Shop Jimmy for providing great products! 😀

I finally replaced the backlights in my 49" TCL Roku using this video. I watched several others for 55" & 65" but couldn't find one for my model. This TV is nearly identical. It took me about 3.5 hours, not including the time it took to run to the auto parts store for some adhesive. The LED strips I got from ShopJimmy didn't come with double-sided tape (I didn't pay attention) so I ended up using some clear silicone RTV sealant. It's supposed to be good for temps up to 350 degrees Fahrenheit. I was worried it might not hold but then I realized that the standoffs help hold the strips in place. This was my first TV repair. I could have done it faster in an actual workshop, instead of on our queen bed (for lack of another suitably large space).

I cannot stress this enough. If you are going to attempt this BE CAREFUL with the screen panel. Even if it bends a little it will break. My model had the panel slightly attached to the other parts so before even using the suction cups you had to detach it extremely carefully. I fixed the backlight but now you can only see a very well light up broken screen.

Thanks for the great video, I watched it a year ago but I can only comment now because your music put me in a coma 🙂

I got a 43S435, and it randomly went blank on me, nothing. Messing with it, resetting it and such found that i would see the red logo for a very split second, less than half a sec. I ordered and replaced the power supply like the one he was testing in the beginning and the tv works now. It was like 10 screws to get the back cover off and 3 to get the power supply off, with two small connectors. Very simple repair, but i was basically throwing parts at it with no testing, but i figured it was the supply as the lights looked fine when it was on that split sec. Just FYI.

These TCL TVs are such garbage, two of my friends keep having these backlight issues, every time it's just burnt leds, every time I see these used TLC tvs they always have backlight issues. I just saw an a local ad, someone is selling a big TLC smart TV for very cheap and of course it has this backlight issue, that's the main reason I came here to see how easy it is to fix, lol.

So a quick question how can you test the back lights on there own to see if there out. Can you put voltage to them by unplugging them and if so how much voltage?

So I snagged a free 55s405 with no backlight. I’ve done a bit of digging on the power supply to see if I can rule that out before tearing apart to replace the leds. Is it normal that on power up, the psu will put out about 38v for a split second then drop down to about 1 volt? I’m wondering since it’s not putting out higher voltage constantly like your example, I actually have a bad psu. Thoughts?

I used this video as a direct guide, but I also watched some other videos that talked about tips in depth (although for different model set) Anyway long story short, thank you so much for this! It took me about 5 hours, I went slow and had to go to Home Depot in between for some solder and double-sided tape. There was a ground connected to one of the panels - thankfully, I had a soldering iron so it was easy work. This video covers all the main steps. My tv works now! Again, I did a little more research for tips beyond this but overall, I had this playing while I did the repair. 38 bucks for the replacements, then about 20 on some miscellaneous items for the repair. So for about 58 bucks i fixed it

You got a like and a comment from me sir. Figured I would spend the $25 USD for the new back lights. Just replaced them myself and TV is working as it should. Took me all of an hour or so. I didn't use the two sided tape. I felt the stand offs would keep them in place just fine as they do. Thank You.

Bonjour, ou sont les connecteurs des LED ?

Thanks for this! Our TV hadn't been working (thanks to our 5 year old dragging his hand on the screen for "No reason"), and we were confident it was an issue with the backlight. My husband is in the army, so while he was away training this week, I took a chance on it, and followed this video. We now have a working TV! I think he will be very thankful when he returns as well!

TCL43S433... I get momentary backlight when I plug in/power-on.. then black. Can see display with flashlight against the screen. I have already replaced the backlight... no improvement. Voltage to the backlight reads 87V. Based on that, the power supply board is ok??? What next?

How do I know which points to check on the power supply? Edit: Is it 1-3, 1-4, and 7-10?

my TCL model 43S431 reads 145 on led volts this seems high to me if i wiggle the tab the LED power wires plugs into Backlights all come on but even when unit is shut off

Thank you so much. We fixed our tv from this video. Saved us hundreds of dollars by not having to purchase a new one like some Reddit threads suggested.

But you didn't show testing the individual light strips using external power supply box to confirm bad strip(s).

What happens if I don’t use double sided thermal tape?

This looks like an absolute @#$& to do. I thought I fixed my problem but now the LED went out. 😡

No led tester to find which strip was defective. Not a repair but replace video

Waste of time you need new led stripes for the price of those you'd be better off taking it to be repaired or get a new tv

6 minutes in, yeh I'm just gonna buy a new TV..😂

Any videos on RU-vid fixing and repair cleaning build anything that is NOT playing dumb FAAT forwaing LOUD ANNOYING music whole time

Miller Timothy Miller Angela Taylor Laura

Just finished my repair and the LEDs worked. Unfortunately I was not careful enough and damaged the panel by getting the reassembly steps in the wrong order. Specifically I forgot that the plastic strips were just for holding the optical layers together and NOT the panel. I should have realized I was using too much force, but alas! Bottom line, watch the video all the way through once or twice BEFORE doing the repair 😅

Hello I have the following problem, in the television comes only 44 volt on for the led. How can I fix this and what can it be? The LEDs need 94 volts. Thanks for answers.

Great instructional thank you. Was almost exactly the same for my 65' FFalcon tv - just more rows of led's in it. Tv had picture if i shined a torch into the screen so the LED replacement worked.

Alternatively, this seems like a good excuse for a larger, better tv.

Good pace,easy to follow, very clear and informative. Great job. Thank you.

Hi Jimmy thanks for the teardown vid here helped alot. I have a TCL 43DP600 that just popped on Christmas Day. Typical! In any case LED's check out ok. Led voltages are settling around 38-50 vdc. With LEDS connected and disconnected. So I'm going with power supply issues. No idea where to get a new supply board tho😄

I didn't get no power out of my lead only like 45 and one or two so I guess I got bad power supply

How many backlight strips are in tcls421?

Thank you Man for this video!! thanks to this I succeeded to repair my tv with a few euro. Compliments 👏🏻👏🏻👏🏻👏🏻

This looks worse than it actually is to repair. Luckily there isn't really any adhesive or tape holding the panel in so as long as you are gentle you should be ok.

Worked for me. Freaked out when I got my LED strips out and didn't realize there were two different lengths lol. So glad I found this.

One line reads 38v the other 189v…

My power supply is reading around 77v bad power supply

Just wondering for those coming here, are you replacing the led strip or the power supply most of time?

saved my tv thank you

Is the step with the double sided adhesive required or just preferred?

Seems strange that all 4 led strips would go out all at once but mine did the same thing

Great Video I had a top row go out on as TCL 55S421 picked up thru Ali Express for $ 6.00. Only thing different I used Lexel to glue them back in place. Thank You made it easy as could be.

So on a tcl 55s421 is there any adhesive on the screen like there are and some other TCL televisions or ones i get the bezel off i can just pull it off ? thanks

What are you did Mr? You not teaching anything to people who have never done this. You need to talk and describe what you doing. Your camera should show things what you do from your side and not from the opposite side.