Question about LG 42LM3400 42" LED Cinema 3D HDTV w/ 4 Free Pairs of 3D Glasses

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How to repair LG TV

TV is no green light indictor, screen is black when turn on, the red light indicator is flashing red when turn on but no green light

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The power supply may have failed.

Posted on Nov 07, 2014

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Posted on Jan 02, 2017

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Going to be a economic decision---not likely to be a do it yourself repair--consider taking to a shop for a estimate.

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The flashing green light is likely indicative of a self-test failure, indicating the TV has detected some sort of internal fault. With no picture or sound, one strong suspect is the power supply. Flat-panel TV's have an internal DC power supply that converts the inbound AC current, and when these fail, or are unable to supply a minimum level of power to the set, it can behave as you describe, providing only enough power for the green light to illuminate.

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Will not turn on, green light is flashing...


Flashing green light usually indicates the TV is need of repair. This is the TV's way of letting you know that its needs to be fixed by your local tv repair shop or to contact your tv manufacture. Hope this helps.

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The tv wont turn on the lights in the front of the tv all stay on the red and two greens and when you try to turn on the power the lights just flash and the screen stays black


That is indicating a internal defect. It's likely you will require a shop repair. Contact the manufacturer with the model number and ask for a referral. The flashing lights indicate that the television is telling you there is a failure someplace in the internal circuitry.

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