Samsung LCD - repair or trash?

[curtis73]

As far as I can tell, my Samsung 42" LCD (about 6 years old) has lost the backlight. In the middle of a show the screen goes black but audio is still there. Problem happens on all inputs. I can sometimes get it back by shutting off/on 10 times or so.

Normal start up I get a relay click, a tone, then the screen goes grey as the backlight comes on, followed a half second later with display/audio. When its not working I get everything up through the tone, but no backlight and no display. I assume the video/display is still functional, just not visible. I think I'll take the back off and shine a flashlight through the screen to see if the video is still there.

Is there an online source for the schematics so I can start testing/repairing? I would hate to trash it if I could just solder in a new relay or something. I bought a new LED 46" to replace it, but this 42" would be nice for the guest room if I can fix it.

 

[Pyrrho]

As far as I can tell, my Samsung 42" LCD (about 6 years old) has lost the backlight. In the middle of a show the screen goes black but audio is still there. Problem happens on all inputs. I can sometimes get it back by shutting off/on 10 times or so.

Normal start up I get a relay click, a tone, then the screen goes grey as the backlight comes on, followed a half second later with display/audio. When its not working I get everything up through the tone, but no backlight and no display. I assume the video/display is still functional, just not visible. I think I'll take the back off and shine a flashlight through the screen to see if the video is still there.

Is there an online source for the schematics so I can start testing/repairing? I would hate to trash it if I could just solder in a new relay or something. I bought a new LED 46" to replace it, but this 42" would be nice for the guest room if I can fix it.

If the screen sometimes comes back, and looks fine when it does, most likely it is worth repairing, though a new 1080p 42" LCD TV is not much money; a new name brand one can be had on sale for less than $500, and it almost certainly will give you a better picture, and will likely weigh less and use less power as well.

If, however, the screen were damaged, then it would be not worth repairing.