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My LG 47" LCD: Modle # 47LB5df-UL works only sometimes, but never the first time I try turning it on. The light blinks red then green then a black screen comes on but no sound or video, and the only way to make it work sometimes is if you pull the AC cord out and put back in, many times. Then finally when the TV turns on, it works fine. So what is wrong, and how do I fix it, and whats it going to cost.

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The capacitors on the power source have aged and they need more time to be charged, time that the security system on the source detects it as a failure. You need to replace them all ASAP, otherwise they will fail for good and the damage done will be way expensive.
Now it will cost you less than $40 to replace them all, but you need at least a basic experience in recognizing the parts and correctly soldering them. If you don't know that then ask someone who knows to help you: it's an hour to take them all out (make a very detailed drawing with their exact position) - a few days to purchase their replacements and another hour to solder them back.

Posted on Sep 11, 2010

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