Re: Vizio Failing afterwarm
A comparison in voltage readings between working and not working is best, to see if anything changes between working and not working states. The idea is that if something changes you can hopefully use that to narrow down where the problem may lie.
If it never works, and you can't compare states, then taking voltage readings anyway is still generally the first thing to do. You might notice that one voltage rail is missing, for example. Then you can try to find out why.
To start with, you want to take readings with all boards plugged in, try to find out if there is anything obviously wrong with the readings, and then try to find out why. Unplugging boards only makes sense if the readings suggest it. Pulling boards at random doesn't usually give any sensible results. If the symptoms changes, is it because the board was faulty, or just because it's now unplugged? You need to have some idea of what unplugging something is going to do.
If something dies after 1 minute a heat related issue is possible, a can of freezer spray would probably be used too.
Actually in the case of it dying quickly like that, what I'd probably do is check everything in the failure state, if any rail or signal looked suspicious\missing, then check just that signal\voltage again after it cooled down and was working. Then you don't need to try to check everything during the limited time. If you found that it changes, then you should at least know where to start looking.
That's the kind of general idea, anyway. Or at least, how I would do it to start with, I suppose. There may be better ways.
A comparison in voltage readings between working and not working is best, to see if anything changes between working and not working states. The idea is that if something changes you can hopefully use that to narrow down where the problem may lie.
If it never works, and you can't compare states, then taking voltage readings anyway is still generally the first thing to do. You might notice that one voltage rail is missing, for example. Then you can try to find out why.
To start with, you want to take readings with all boards plugged in, try to find out if there is anything obviously wrong with the readings, and then try to find out why. Unplugging boards only makes sense if the readings suggest it. Pulling boards at random doesn't usually give any sensible results. If the symptoms changes, is it because the board was faulty, or just because it's now unplugged? You need to have some idea of what unplugging something is going to do.
If something dies after 1 minute a heat related issue is possible, a can of freezer spray would probably be used too.
Actually in the case of it dying quickly like that, what I'd probably do is check everything in the failure state, if any rail or signal looked suspicious\missing, then check just that signal\voltage again after it cooled down and was working. Then you don't need to try to check everything during the limited time. If you found that it changes, then you should at least know where to start looking.
That's the kind of general idea, anyway. Or at least, how I would do it to start with, I suppose. There may be better ways.
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