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No picture This 42" lcd tv has sound but no picture the backlight is working. is it the lcd controller power supply or main board?

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The way to isolate the failure to the power supply would be to measure the voltages going to the backlight inverter board. If all the voltages are normal then is more likely a defective backlight inverter board or LCD controller board.

Posted on Jan 05, 2009

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Posted on Jan 02, 2017

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2 Answers

I have a 32" Samsung LED TV with not picture. Audio is working.


Do flashlight test - if you can see image you need t con board. If no images seen, inverter board. TV Parts Universal TV Stands DLP Chips ShopJimmy

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I have an LG 47LN522-UB LED TV that stopped working after three years and need help diagnosing a problem with it.


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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How can I fix black screen on Philips 42" LCD TV?


chances are it is cracked solder joint on internal board,
check link below, press the helpful button

http://www.repairfaq.org/samnew/tvfaq/tvtmmqcs.htm

Jan 24, 2016 | Philips 42PFL7422D 42 in. LCD TV

1 Answer

I have a Samsung LN40A450C1D TV that has sound but the backlight doesn't come on. I replaced the power supply board and same problem. I then replaced the backlight inverter. Same problem! I'm absolutely...


You have to check all the voltages, that comes from its main power supply board, to its back light inverter board. These is one pin at the backlight inverter board; comes from the main board; which controls the back-light inverter to start and off. This voltage is generated at the main board, and send to the back-light inverter board, as control voltage. It will be best to contact any service technician. If you wish to get some details; check the site linked here.Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/

Feb 24, 2014 | Samsung LN40A450 LCD TV

1 Answer

Backlight issue


Check the incoming power supply voltage to its back-light inverter, from main power regulator board. Check the main power regulator board.

Oct 17, 2013 | Vizio XVT3D474SV 47 in. 3D LCD TV

1 Answer

I have a X2Gen 42" LCD (MV42P) that has no picture


if there is no dispay in the screen atall then it has to be the screen or the unit controlling the screen which can be in the same unit as the screen sometimes also if you have replaced the power supply the main board and the controll board then there is either something wrong when fitting them or one of the units are faulty but i am thinking the screen mate i cant explain the sound it could be caused by the fact there is nothing to display meaning there is no picture being send and no sound,,,,


if you have any light atall in the screen when the tv is turned on this cant be the problem

it sounds like the input device is not inputing anything ie the hdmi or scart is not sending through and the tv and dtv are not sending this would explain why no screen and no sound because there is no sound or picture being send through and because the unit is broken there is not even any menus

Feb 24, 2011 | X2Gen HHE-MV42R 42 in. LCD HDTV

1 Answer

Sound is good but no picture


If there is no backlight (check it in a dark room - if there's a backlight the display will be emitting light, albiet still all dark) then you're looking to replace backlight inverter (or two of them, if it's master/slave) OR the power board. To know which of the two, measure the voltage on the cable that comes from the power supply to the LCD backlight inverter board - it has lots of cables but most of them are split in 2 groups - ground and positive usually 24V. It's fairly easy to see which are which, especially on the power board.
So if there's 24V there then it's the inverter(s) and if there's nothing then it's likely the power board; it's a little tricky, though, because the main board may turn off the backlight power - so make sure you check the voltage when turning the TV on from off and watching the read.

If there *is* backlight then you;re looking at replacing the tcon board or, less likely, the main board or, least likely, the cable between them.

Please rate my response if it helps.

Nov 06, 2009 | Vizio VO42L 42 in. LCD TV

1 Answer

Sharp Aquos HD black screen. Sound but no picture. Remote will turn TV on, but will not change inputs or do anything else. Happened suddenly.


Look at the venting grills to see if you can see any white lights inside, if there is no light, the backlight inverter board may have gone out or the main power supply for the inverter board is not working. If you do see the lights then the problem can be in the main controller board.

Nov 06, 2009 | Sharp Aquos LC-42D62U 42 in. LCD HDTV

1 Answer

LG LCD 42" tv sound but no picture


The backlight inverter board may have gone out or the power supply is not supplying power to the inveter board, those are the two places to check.

Nov 02, 2009 | LG 42LC2D 42 in. LCD HDTV

1 Answer

I CAN TURN THE POWER ON. THE SCREEN STAYS BLACK.


This TV has 2 main circuit boards (2 LCD backlight controlers): the Power Supply board may have fried the video board on it's way out ...
You can either arange to have the TV replaced under warenty if not have it serviced. In any case best of luck with Vizio support line.

Everyone bought this TV because it was so cheap... now we find out why: Vizio cuts corners on everything from engineering to support!! All brands are not created equal. Sometimes you get what you pay for.

Feb 09, 2009 | Vizio Gallevia GV42LF 42 in. LCD...

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