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 ShopJimmy.com 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. http://electronicshelponline.blogspot.com/ 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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Can you fix a power supply on a Sanyo,no sound,no picture


Sanyo TVs usually only have two boards in them , doing a visual inspection of the power supply capacitors usually reveals swollen or bulging capacitors.
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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Zenith z50pg10 its dead no click, no led blink nothing !


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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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May 26, 2012 | Televison & Video

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 http://www.discounttvparts.com/6871VSMS28B_p/td-1169.htm

$100 on this site http://www.ebay.com/itm/NEW-LG-MAIN-UNIT-6871VSMS28B-6870VS2273C-/260877125964

Hope it helps..

just add a comment for any follow up questions..

Thank you

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1 Answer

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Possible there is fault in the processor section of the main board. You will need to check the main rail of 5 volt to the processor and allied section to start with the probe. If absent the 5 volt regulator must be checked. If present the processor and in many cases the board is a suspect as component level work might be difficult unless equipped.

Jan 07, 2012 | Panasonic Televison & Video

1 Answer

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


the power supply of your TV must be check.the power output of the power supply suppose to be 12 volts for audio,24 volts for the backlight lamp and 5volts for the main CPU. use a multimeter to measure the voltage In the case of your TV it seems only 5 volts is present that is why you have a power indicator lit....open the back cover of your TV and measure the power supply.power supply board is where the power cord is connected...

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Any luck getting this fixed?Please let me know.Thank You very much!
Tyler

Jul 13, 2010 | Akai LCT2662 Television

1 Answer

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 jah2mil@hotmail.com

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2 Answers

No picture


with most startup issue with this model there usually is a blink code sequence on power led on front of set. regardless of sequence though you would want to isolate problem by disconnecting y main from power supply and check voltages on power supply and if they come up replace the y main and y buffer boards located on left side of tv looking from back and if voltages do not come reconnect y main and disconnect x main and check voltages again and if still not coming up reconnect and verify vs on command on pin 2 of logic interconnect and if 3 volts present replace power supply and if 0 volts present replace ssb

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1 Answer

Samsung plasma sp-r4232


Remove the power supply cable to Y Main board, check Vs on power supply board when you turn on tv.
1. If you have normal Vs, replace the Y Main board. If still not work, replace the Logic board.
2. If you don't have normal Vs when you try to turn on your tv, just replace the Power Supply board.

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