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Repair guides and support for your Sanyo TV.

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Sanyo LCD works for 15 minutes, then power-cycles

I have a Sanyo LCD-32E3 that worked fine until recently.
Now, after having a perfect picture and sound for about 15 minutes it turns itself off, and then seems to power-cycle forever. The backlight goes on and off every few seconds, and the power indicator in the front cycles between red (standby) and green (on), but there is no visible picture.

This behavior seems to be temperature related, as the TV works fine (for a while) when it's cold, but the uptime is much shorter (if it turns on at all) if I retry it again after it "crashed". I need to let it cool down for a few hours I get another 15-20 minutes of operation.

I took the back off and checked all the boards, but cannot see any obvious blown capacitors or other scorch marks.

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Hi @frescard

To check if it is temp related, remove the back cover and use a fan to cool down the boards.

Try placing the fan so that it cools one board at a time more than the other boards so as to try and isolate the problem a bit further.

With a bit of luck if it always seems to be associated with one board then the service manual will possibly help.

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crwdns2944067:03crwdne2944067:0:

That's a great idea with the localized cooling! I'll definitely give it a try tomorrow.

I did already have the service manual, but it was a bit above my pay grade... But I guess I can check the specified voltages while its working vs. after it crashed. Perhaps that'll help pin down the culprit a bit better.

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So I tried cooling just one board at a time (while blocking the other parts as well as I could), and in both cases (cooling either the power board or the main one) the TV kept going for well over half an hour. So either my fan blockage wasn't good enough, or the cooling of the backing board itself did the job.

So, back to square one...

I should also mention that sometimes the TV will turn on by itself. It did it before, but today it did it a couple of times after I had done my testing. (Originally I had suspected a flaky remote, but this time the remote had no batteries, so it must've been one of the boards).

No idea where to go from here. I guess erratic behavior like that is always the worst case scenario.

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@frescard

Intermittent or erratic behaviour is always the worst case as trying to isolate where it is and have it working at the same time is difficult especially when it is temp related.

Perhaps get a cheap IR camera or IR thermometer as this would show what's getting hotter than the rest.

At least it may give a starting point where to look more closely

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