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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6ya6ya
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Posted on Jan 02, 2017

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Nope. It appears that you now have a main power supply issue since the set is dead.

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My lg tv screen is black and wont turn on


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

You might want to Google the model number with "parts" to see what boards are available and at what cost.

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Turn tv on. green light solid display, no picture or sound


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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The screen doesn't go on when the power to the TV is turned on.


View your screen from a flat angle while on a known active channel to see if you can detect any 'ghosting' of images.
I think either the back-light or the high voltage supply for it has failed.

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I can't turn on my 32 inch plasma tv by LG.A green light flashes twice on the power indicator than turns red.


The flashing indicator is telling you the fault. Give the number of flashes to the LG service department and they can help you with your issue. It will likely need service.

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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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to thus problem its very simple .! try to resolder at the back of the picture tube board.

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