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TCL No Backlight, Black Screen, Flashlight Test Good, Menu Sounds Good

I have a 55” TCL Roku TV (55S405TNAA) that was working fine, then the next time it was turned on has no picture. Clicks are audible when adjusting the volume or navigating the menu. Flashlight test does show the menu.

Is this most likely a panel issue or an LED strip issue? If one LED strip goes out does it deactive the rest?

I feel confident and comfortable that I could replace any of the panels.

I do not feel so comfortable about replacing the LED strips after watching a youtube video…hoping its not that.

Thanks!

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Répondu ! View the answer J'ai le même problème

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Was this issue resolved? What was the outcome?

par

I have the same issue 55s401, no voltage at the LED out put, connected and disconnected. I have my 12v on the main board connector. Going to order a new one out of a damaged set to try. 1 year and almost a month old TCL wouldn't give me the time of day. Go figure. Any one find out anything please email me. bgt109@gmail.com thank you.

par

We have the same problem with a 14 month old 55 401 again TCL could not care less about our issue!

par

mine lasted 16 months ha ha

par

Mine has same issue..owned about 18 months...live and learn

par

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Solution retenue

I am repair tech. From the troubleshooting you have strong chance you have LEDs bad. This model is easier than most to change LEDs. There is 2 version of LED strips. You will need to use numbers on the strips and/or LCD panel number to get correct parts. Do not order by model number alone. Good luck

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I have a tcl 55 s405 made in march 2018 with same problems. I ordered the total repair kit with all three boards from shop jimmy and that didn't work so now I'm sure it is bad led strip. Hate to spend much more money on it. Did not last 2 years. It appears tcl leds don't last . I won't buy another tcl.

par

Same here my TCL nade it 16 months and sound but no pucture

par

Yeah same, not buying this TV again.

par

Same...55" TCL Samsung 55S405 which is less than 2 years old and black screen. Nothing has worked so buying a Samsung. Right now using my 32" 12 year old Samsung and it is a better picture and sound..

par

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@kzoomarine check your power board first. Test the LED output connector with a voltmeter and let us know what you get. It could be the power board. If it checks out ok…….well I am not going to say it but you know what it most likely will be.

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Ok, so I plugged in and turned on the TV, put the multi-meter to each pin (they’re not labeled), and got 0.0 volts for each one. Turned the TV off and unplugged it, unplugged the LED output connector, turned the plugged the TV back in and turned it on, then again put the multi-meter to each pin…again 0.0.

So it looks like I lucked out and it should just need a new power board, right? Other parts of the board did have 12v and 40ish volts. Is that normal for just the LED connector to go out?

par

Ordered a new power board, but have the same effects. Not sure what that indicates. Added images to the original post.

par

@kzoomarine post an image of your complete power board or if you can give us the power board number.

par

Images of the full board and board number added to the original post. Same voltage results when the led connector is plugged in as when its unplugged (shown in the image).

par

Ken, did you figure it out? I have the same tv and same issue. Thanks

par

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Ken Scott sera éternellement reconnaissant.
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