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Screen flashes black

TV= LG 50PC56 screen flashes black during some: programes(tv)/websites(pc)/folders(pc). All cables and connections appear fine.

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Hi. The method above is only for LCD.

Your problem is on PSU board. It`s in the middle when you open the back cover of the set. The board fixed with 8 screws . 3 crews (one on the left and 2 on the bottom) have small metal plates soldered in to the board. You have to unscrew it and clean the plates under it. The plates connected to the ground and must be screwed very well. Bad joint of the plates to the panel ground causes black screen problem.

Posted on Jul 12, 2014


You mentioned this would work for LCD monitors, is the method the same for plasma screen's, thanks for any help!

Posted on Mar 07, 2008

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Hi this is the way how to examine what's wrong with your LCD monitors. After you turned it on and the screen blacked out, you have to check that if you can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. This is because of the lamps inside screen. Some of them were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,

Posted on Mar 07, 2008

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