Question about LG 42LC2D 42 in. LCD HDTV

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LG 42LG5 TURN ON TV PICTURE GOES BLACK

TURN ON TV AND PICTURE GOES BLACK, AND SOUND KEEPS GOING. MUST TURN OFF TV AND TURN IT BACK ON TO GET RID OF THIS PROBLEM. HAPPENS 95% OF THE TIME???????

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  • sb12995 Feb 12, 2009

    I have the exact same problem except mine goes to snow 1st then goes black! Does anyone know why? How to stop this thing? I just bought the set and feel cursed?

  • anvir_b_101 May 02, 2009

    i have the same exact thing happening to my lg projection tv i have sent it in for repair about 3 times but no one could find the problem
    could any body help

  • lina May 04, 2013

    mine is black no snow or anything else , because it takes a long time to turn on if i go out during the dat i do not turn it off

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  • Contributor
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This could be 1 of a few things here. Without opening up your set and trying to look at voltages or indiciator lights I couldn't tell you exactly without some more info.

Without looking at it myself here are my thoughts and where I would first look at.

It may be a main board because:
1) Main board processes all your audio/video signals. Bad main board means bad video processing. Could do that. Especially if the main board is not sending the right signal or a bad signal to the rest of the boards so they don't do their jobs. 

It may be a power supply because:
1) Power supply is well, the power supply. If it's sending inadaquete voltage to the main board you may not be recieving enough juice to keep that main board doing your video processing or further up the line keeping enough juice flowing to your TCon board to keep it telling things where to go and what to do. The power supply sends voltages to your Ballast board(controls your lights) and to your main board through which power is supplied to your TCon board via a LVDS line and a +12/+16V signals. If the power supply isn't pumping out enough juice to keep the TCon or Main Board running, it could be a problem. By the same token it could be that your P/S isn't sending power out to your ballast board. 

It could be a TCon because:
1) If the TCon is bad, you won't get your pictures. This could be the TCon board itself or the LVDS cable from your TCon to your Main. However, with few exceptions, if it's a bad TCon you're looking at a total panel replacement. 

It could be a ballast board because:
1) The Ballast Board controls the lighting behind the LCD screen. If this isn't working right you won't be seeing much of anything without that back lighting. If this is bad, it's a panel replacement. These are not field replaceable items by LG. 

Based on the symptoms, without more data or a eyes-on view of it, I would say you're most likely looking at a Main Brd or PSU problem. 

Posted on Feb 21, 2009

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  • LG Master
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It's likely the tcon board, but may also be the LCD inverter.

BTW the problem is not the same for projection TVs.

Posted on Nov 07, 2009

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