Question about LG 37LC2D Television

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LG 37LC2D TV - after turning on, screen remains black for 5 minutes or longer, then it starts to flash white rectangles of varying sizes. That continues for several minutes, then we have sound and picture. After about 30 minutes of good sound and picture, the screen suddenly goes black and no more sound. Eventually, it will turn itself off.

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This is a sort of slow start up and it can be a fault in the Power supply as the voltage builds up or in the display drive section where the fault seems the same as a circuit trying to act upon. There is a defined failre but only if the observations of the voltages are taken out and confirmed.
Start with the Power supply and check if the filter and storage capacitors are topped up with the designed voltage, if there is slow build up then check the reason if in the drive for poor swithching or a poor capactior.
Next check the same with the main board , look for IC's getting warm , if so use a freeze it to cool and set the picture to start up therby confirming the IC. repeat check, observe for heat and changes in voltage.respond
please try this link for tips:

Posted on Oct 02, 2010

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Things to check: Make sure your TV is set to the correct input.
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