Question about LG Televison & Video
Before replacing the main board, the PSU should have been tested. This TVs PSU provides power on different voltages, and each voltage is controlled through a low DC control line from main board. A defective PSU may turn off and restart by itself.
In real word I repair many LCD TVs. I do not get tired of repeating that LCD TVs are very different from home computers. Repairing by simply board swapping does not work. Although this units have few parts, the working process of the TV does not allow identifying reasons of faults from symptoms (with a PC you can often tell), parts are expensive, and testing is always necessary.
In your case for example the problem is likely a faulty PSU, but a bad grounding caused by missing screw may also cause the problem. The PSU, which is likely culprit, must be tested by jumping the control lines and reading volts to main board. This is made more difficult by the fact that the TV is forcing shut down, and turning volts off continuously.
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
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