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Lg 42le4500 HAD NO PICTURE BUT SOUND NOW I HAVE NEITHER

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  • LYNDEN JONES
    LYNDEN JONES Dec 30, 2013

    I have an LG42LE4500. The tv picture started to on and off but with sound. Then it went off altogether with neither picture or sound. pulled the plug to reset but still no good. i've taken the back panel off and give it a visual. all the caps seem fine on the power/inverter board although i have not tested them yet. Need to get a tester.the set powers up ok and the white light stays on but nothing on the screen, just black, no glow or nothing. Could this be a chip in the main board?

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jerryg50
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SOURCE: lg 42le4500 tv when first turned on its okey after 2 minutes no picture black screen but sound ok, turn it off and back on againdoes the same

I would bet on some component(s) have become thermo sensitive. Most of the time capacitors can do this type of thing. Most likely the defective caps could be in the power supply.

To locate the defective caps, you would have to be able to run the supply and use the combination of a heat gun and freeze spray (liquid air spray) for cooling. At the same time you would have to monitor the output of the supply to see the components that cause the output change.

It is also possible to have thermo sensitive components on any of the other boards. This would also require proper troubleshooting.

The service rep would replace boards until he found the defective board. Then he would return the set with the new board and the bill for his work.

If your set is out of warranty, it may be better to consider a new set. Servicing these can be fairly involved and expensive.

Jerry G.

Posted on Jun 26, 2012

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I would bet on some component(s) have become thermo sensitive. Most of the time capacitors can do this type of thing. Most likely the defective caps could be in the power supply.

To locate the defective caps, you would have to be able to run the supply and use the combination of a heat gun and freeze spray (liquid air spray) for cooling. At the same time you would have to monitor the output of the supply to see the components that cause the output change.

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