Question about LG 42LV4400 42-inch LED TV

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Is any one know the part to replace to fixed 42lv44oo main board

Tv not turning on 5 volt present

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Posted on Jan 02, 2017

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SOURCE: How do I test my main board in my 42 LG LED TV?

Testing the board is too complicated to try to explain in this forum. If the tv won't turn on with either the remote or with the tv buttons, the main board is failed and needs to be replaced. I have gotten some tv's working by replacing the EE prom on the main board, but finding the proms is hit and miss. Go to and see if they happen to carry one for your tv.

Posted on Mar 18, 2015


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LCD TV backlight goes off but still sound is present. Sometime it happen within few minutes and sometime take 30 minutes plus. Is that inverter Problem or CCFL? how I can rectify?

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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If the capacitors look good, voltage checks would be needed to isolate the problem to either the main board or power supply. Check for 5 volts to the IR board (& or keyboard) , if five volts is present suspect the main board

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If the capacitors look good, voltage checks would be needed to isolate the problem to either the main board or power supply. Check for 5 volts to the IR board (& or keyboard) , if five volts is present suspect the main board
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1 Answer

Front LED just Cycles white then goes red. Replaced lamp did not fix set. Found 5 volt power on command missing from Digital bd to DMD bd. Need to replace Digital main bd. Part needed is 6871VSMS28B. Will...

Good day!!!

if the command signal from main board to DMD board missing the problem could be the main board..

I already found the board online for only $75 on this site

$100 on this site

Hope it helps..

just add a comment for any follow up questions..

Thank you

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1 Answer

When i turn tv on the power button shows its on but no pic or sound

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When I turn my tv on I only have a flashing red and green light. The power to the tv does not come on.

Most failures when the TV does not power ON, are related to the power supply and some cases to the main board. If you intend to fix the TV yourself is easy by swapping boards or if you are able to isolate the failure to one particular board(power suppy) even better. If you're DIY, open the tv and check the power from the power supply to the main board using a voltmeter. You should be getting 5, 12 and 24 volts going to the main board.
If you need further assistance. let me know or write to

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2 Answers

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1 Answer

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Remove the power supply cable to Y Main board, check Vs on power supply board when you turn on tv.
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