Question about LG RZ-20LA70 20 in. LCD Television

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Power up problems

Hi I hope that someone can guide me in the right direction to solve this fault. I have an LG RZ-20LA70 TV wich will only intermitently turn on. when in standby if you press the power switch the led always changes from red to green. Sometimes it will power up ok but normally all that can be seen is a white screen (backlights of the lcd turn on) but no video, audio or on screen menus. under fault conditions a soft pulsing sound can be heard from the speakers. I would appreciate any feedback regarding this. Thanks

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Re: Power up problems

It sounds like the power is pulsing - that would explain your speakers. Speakers wouldn't make that sound if they were getting power at a steady rate. Look for a bad capacitor. It's possible you have one or more capacitors that have gone bad. They charge to a certain point, then somehow complete a circut momentarily and discharge, giving a pulsing flow of electricity. You can look for visible signs (leaking capacitors, or capacitors that are leaning over), or you can just start testing them with a voltmeter. If you find a bad one, you'll have to get a replacement and solder it in place.

Posted on Sep 06, 2007

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