Extra lines and missing lines in Samsung ln46c630; panel looks fine

[xeos]

I have a Samsung smart TV, ln46c630 from 2011, with both vertical and horizontal lines corrupted. The panel looks physically fine, as does the rest of the tv housing. I got it from somebody who was putting it out for recycling pickup so I don't know the history, other than their comment that it WAS NOT dropped. Pictures attached of the issue and the boards inside. Yes, the board are abnormally dusty. But nothing obviously burnt or any bad caps.

At the least it seems like the power supply is good since I'm getting a well lit picture and the set seems to work properly, what I can see of it.

So what's the chances that it's the panel that's bad, vs the mainboard or tcon? Anything I can do to check? Or do I have to order parts from ebay blind and hope for success? Those parts are going for almost as much as a used smart tv of this size goes for on our local market.

[xeos]

Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine

ps I read https://www.badcaps.net/forum/showth...light=ln46c630, and tried tapping all over the main board with no change to the lines whatsoever. I didn't try heating any components.

[R_J]

Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine

The problem is very likely the panel, check for water/liquid damage on the board attached to the panel ribbons (located between t-con and panel)

[xeos]

Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine

it's very hard to see said board, and it's not clear what parts (all of them?) I might need to remove in order to get to it. But there's no sign of water ingress anywhere around the bottom of the set, no rusty metal on stains.

meanwhile, I think you are right about the panel being the issue. The T-con has two output ribbons cables so I tried unplugging each in turn. While the majority of the unplugged side was black/blank the horizontal lines did not completely disappear. I've not actually seen that as a diagnostic before, does it have any merit?

[xeos]

Re: Extra lines and missing lines in Samsung ln46c630; panel looks fine

ps the panel exhibits what I can only call spreading: if you draw some bright rectangles in one region the pixels near it will gradually gain in brightness too over the period of a few seconds, like the pixel "whiteness" is diffusing out to nearby pixels.