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Old 04-16-2021, 06:50 PM   #1
BradW
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Default TCL 43" Model 43S525

Was given this new TV that has backlight but no picture.

- When both T-Con ribbon cables that run down to the driver boards are
connected, I get no picture - just backlight.

- When I remove the left-side ribbon (facing back of TV), no picture.
- When I leave the left-side connected and remove the right-side ribbon cable, I get a good image on the right-side of the screen. Seems to be exactly half the screen.

- I've swapped ribbon cables and there's no change so I know the ribbon are good. I've inspected the T-Con and driver board and don't see any obvious burnt or missing components. (not that I expected to)

QUESTION: Is it more likely that the problem is with the T-Con board or the driver board? OR, is it anyone's guess?

Any suggestions on further troubleshooting? Do I start looking for shorts, etc.?
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Old 04-16-2021, 10:18 PM   #2
neilc6
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Default Re: TCL 43" Model 43S525

Backlight but no video tcon is first suspect and boards are usually fairly inexpensive. You can try connecting one side at a time between tcon and panel. If one side is good, you have a fault in the panel on the bad side.
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Old 04-18-2021, 08:47 PM   #3
BradW
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Default Re: TCL 43" Model 43S525

I did try that.
If I disconnect left side cable (from T-Con to driver board), I get a good picture on right side of screen.

If I connect only the right side, I get nothing on any part of the screen, just backlights.

Does this mean bad panel or something on the driver board?
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Old 04-18-2021, 10:12 PM   #4
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Default Re: TCL 43" Model 43S525

If you get a good image on one side, it means the tcon is good and there is a fault on the bad side. You can try blocking some pins from the tcon on the bad side with the tape cutoff method.

https://techhometravel.com/repair-of...lines-on-a-tv/

Sorry only scanned your original post. Assumed you didnt test one side at a time. You should have posted pics of the screen.

Last edited by neilc6; 04-18-2021 at 11:40 PM..
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Old 04-19-2021, 09:23 PM   #5
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Default Re: TCL 43" Model 43S525

I'll post pictures of the screen in the next day or two and also try the crazy tape cutoff method. Learned a lot watching those videos in the link you sent. Thanks.
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Old 04-20-2021, 05:03 AM   #6
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Default Re: TCL 43" Model 43S525

On the bad side of the lcd panel board check for any shorted smd capacitors i have seen a few sets with bad smds causing this issue
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Old 04-20-2021, 05:18 AM   #7
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Default Re: TCL 43" Model 43S525

Quote:
Originally Posted by vinceroger69 View Post
on the bad side of the lcd panel board check for any shorted smd capacitors i have seen a few sets with bad smds causing this issue
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(Signature) One of the first and least expensive things you can do when you have an issue is take the powerboard out of the tv, flip it over and look the solder joints over with a magnifying glass if needed, add a little flux to make the solder flow well and add solder to any joints that look even a little suspect. You can practice on a scrap pcb board if needed, careful not to bridge any joints, and always let the board sit for quite a while or discharge the big caps with an appropriate resister before working on it (safety first) to try to keep from getting shocked, it doesn't take 1000 volts to KILL, a lot less can kill, so be careful, it's only a tv. THANKS FOR THE NO TIP POLICY....WELL NO TIP NO WORK.
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Old 04-24-2021, 05:12 PM   #8
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Default Re: TCL 43" Model 43S525

Quote:
Originally Posted by neilc6 View Post
If you get a good image on one side, it means the tcon is good and there is a fault on the bad side. You can try blocking some pins from the tcon on the bad side with the tape cutoff method.

https://techhometravel.com/repair-of...lines-on-a-tv/

Sorry only scanned your original post. Assumed you didn't test one side at a time. You should have posted pics of the screen.
neilc6, I watched some videos and did the tape cutoff method and narrowed it down to one clock signal line. Once I taped off just that one line (like doing micro-surgery), the TV looks perfect.
Thanks a million. I never would have known about that method.
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Old 04-24-2021, 06:07 PM   #9
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Default Re: TCL 43" Model 43S525

The other issue you may encounter with Roku TVs is the default backlight settings will burn them out so you should turn it down.

https://techhometravel.com/turn-down...l-in-roku-tvs/
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Old 04-25-2021, 08:44 PM   #10
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Default Re: TCL 43" Model 43S525

Yes, I tell everyone the same. Most TV repairs you see on youtube are backlight issues.

This TV went to my nephew and the first thing he said was that he hates a bright TV so he turn backlight/brightness down low.
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Old 04-26-2021, 11:23 AM   #11
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Default Re: TCL 43" Model 43S525

Brilliant work nice one
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Old 05-23-2022, 09:09 PM   #12
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Default Re: TCL 43" Model 43S525

Ok so the tape method worked for me though I have some questions. Right now I have 8 or 9 pins covered and the screen looks as it did before it went blue. No horizontal lines that I can see. Should I go through and try to eliminate pins one by one? Or can I leave as is?

How long does this fix last?

What am I missing on screen with all the 8 pins covered?

Thanks in advance for your thoughts on this.
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Old 05-23-2022, 10:05 PM   #13
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Default Re: TCL 43" Model 43S525

check the video that says 4k tv fixed in the link in post #4.
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