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Why does my backlight keep turning off for HDMI inputs?

I haven't opened up the TV yet, but I'm to the point that I'm thinking I am gonna have too. I'm looking for anyone to point me in the right direction to help make repairs quicker or to tell me which board tk start with or if it's not worth the cost of repairs but i have a hunch that it is repairable.

Here's the issue...

The backlight will shutoff after about 5 to 10 minutes while using my PS5. The time it takes to shut off isn't consistent. It can take 5 mins to 30 mins even, but it keeps shutting off while operating my PS5. I tried different HDMI ports, adjusting TV settings, reboots, a factory-reset, different PS5 output settings, different HDMI cords, different TV/Consoles, I've deactivated all CEC communications, all timers on both the TV and console, I've tried adjusting its mounting, I've checked its power cable and wall outlet, I've performed flashlight tests to confirm it is the backlight shutting off, I've updated it, I even attempted adjusting picture settings and backlight settings...

The only thing that I can find is that the issue seems to stop while using any native apps on the TV... which is why I'm here. It's strange. To get the backlights to turn back on I just have to restart the TV, unfortunately it is the only way I've found so far to re-active them once shut off. Disconnecting HDMIs, changing inputs, picture settings, or switching to native apps doesn't turn it back on, so I think it might be an issue on one of the boards.

My hope is that it might be a faulty component and a quick solder fix, perhaps a short caused by an HDMI cable. I don't think it is the backlights (or hope it isn't), it consistently restarts when the TV is turned back on, no flashing, dimming or other signs that the backlights are going bad, but perhaps it is faulty and keeps tripping something, however that doesn't explain why TV apps work...

Perhaps it is triggered by the PS5 HDR? But I deactivated HDR, lowered resolutions, lowered refresh rates... I mean, I'm really good at troubleshooting and isolating issues. I was thorough this time because the TV is mounted (which could be a potential cause of the problem) but it'll be a pain to take down, open up, repair, and remount. I'd rather fix it without that, but I'm 90% certain it needs opened up, and I guess I just want to speed up the troubleshooting process once opened up...

Where should I look first? Any suggestions or help is greatly appreciated, or if anyone has any other possible ideas for fixes, let me know.

Thanks

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OK, so I took off the back panel and took pictures of the exposed boards without removing them. If you need close up photos of specific sections, let me know.

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Answer this question I have this problem too

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5 Comments:

Can you take the back off the TV, take pictures of the circuit boards, and upload them here? Adding images to an existing question

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@andrewsawesome thanks for the response. I took photos of all the exposed boards after removing the back enclosure. I didn't take anything out, so I'm not sure what everything looks like underneath the boards, but from what i can see all the big components look fine, but I currently don't have my tester, microscope or soldering tools, so this is really all the info I can give you right now, unless you have some ideas, or info

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@tyler fingerle Does the backlight go off if you plug in a laptop/desktop computer, media streamer, DVD/Blu-Ray Player, etc.?

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The second board picture is your power board. The problem is most likely here. However, try connecting a computer screen as a second output. If this second screen does not fail, then you have a broken connecting cable/ribbon between the power board and the main tv screen -careful, high voltage is present when powered up.

Domingo

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Just curious have you found a fix yet? We are a repair shop and have the same model with the same symptoms

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1 Answer

  1. Power off your Vizio TV and unplug all cables that are linked to it
  2. Unplug the TV from the power outlet as well
  3. Search for the power button at the back of your TV
  4. Press and hold the power button for 3-5 seconds
  5. Now, leave your TV in that state for 30 minutes
  6. After 30 minutes, replug your Vizio TV and reattach all the cables
  7. Finally, turn on your Vizio TV

Try this, hope it will work

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I'm well passed that, but I appreciate it

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tyler fingerle will be eternally grateful.
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