Ok, when you unplug it, and plug it back in, it turns on for 20 seconds.
Do you see the display panel light up, THEN it goes out and locks up on you?
Or do you see the panel stay black, THEN it goes out?
Once it goes out, do you see the led lamp "repeatedly blink" a certain number of blinks over and over? If so, count the blinks and let us know how many.
And do you have a voltmeter available to you? You may need one, so here is one you can get from Sears locally
On a TH42PX75U --- If you unplug it and let it cool down, THEN it works fine for 45 minutes before it shuts down again your regulator is the most likely failure point.
I don't think you need to get that voltmeter to test that problem, so hold off on getting it.
I'll look up the Smps part number tonight and we'll get that installed...that's where your regulator is at.
However, do you see the picture do anything odd JUST BEFORE it shuts down, or does it shut down, then when you turn it back on, does it light up the display panel FIRST then turn off, or does it turn on Then turn off WITHOUT the panel lighting up
If the panel lights up, then shuts down, we may also have to replace the Ysus....it it turns on, then off, that points to only the smps.
Actually, you can buy the Power board, or actually send it in for a rebuild.
Moduslink is good for that, and a pretty good price too...especially when some companies want $400 for a $100.00 board/repair
Part number is TXN/P1BJTUS
Other than that, you have 4 regulators, 16 output transistors , 4 photoisolators to replace on your board, because we do not know WHICH power section is actually causing the shutdown -- it's easier to let Moduslink do the hard work.
I'd give them a call....
Also, the sites I listed have a picture of the power board, you can easily trace the AC cord's jack directly over to the power board.
If you ship it to Moduslink -- those USPS postage boxes (one fee boxes) seem to be the best way to get it there.
Get some bubble wrap to pack it
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