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LG TV has discolored vertical lines

Update 2: It was an IC on the board at the far back (4ZX27 - 05; 040803 as best as I can tell printed on the IC). I used an arrow to show the approximate location behind the other boards.

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I actually re-soldered the connections and that did the trick for a moment, but as I was putting everything back together, some of the lines came back. I was using a screwdriver wrapped in duct tape (because I don’t have electrical tape handy) to pull the board out slightly to push the solder back together to remedy the lines on the TV. It worked until I somehow connected something on the picture with the red circle to the back of the TV and something popped and smoke came from the area where the purple arrow is. I think it might be a transistor/voltage regulator on one of the heat sinks, but I don’t know how to tell or how to fix it.

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Update 1: I was able to find a chip in the back board that was causing the issue. However, when I was putting it back together, I accidentally connected the back of the TV (ground) with something on the board in the picture with the large capacitors. Something popped and some smoke came from that board. Now the TV won’t turn on at all… Did I blow a fuse or ruin the TV?

Hi, so I have a 42” LG TV (Model #: DU-42PY10X) that a friend gave me. The tv turns on great, but it has a spot on the right side of the display where the pixels are discolored in a vertical stripe. If I leave it on long enough, one of the bars goes away. Also, I haven’t seen it yet, but they say that the TV fades to black if left on long enough. When that happens, only the sound works. From what I’ve read on other posts, it’s most likely a t-con board or a capacitor, but I’m not really sure how to tell. Thanks for the help!

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Answered! View the answer I have this problem too

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@hotrod8380

“I was able to find a chip in the back board that was causing the issue. However, when I was putting it back together, I accidentally connected the back of the TV (ground) with something on the board in the picture with the large capacitors. Something popped and some smoke came from that board.” what chip on what board. Mark it and post some more images of the damage. No T-con board in your TV. Those have Logic control, X, Y sustain, buffer boards. Your error looks more like an X-board error or an IC failure on the control board. If we know what chip and what board you most likely have found the culprit. Unlikely you blew a fuse most likely a component on the board.

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There wasn't any visible damage, but when I pressed on it, the lines went away. I assumed it was a soldering issue and it seemed to work. See update 2 for details. Thanks for your help!

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That area is your power board. We would really have to have a good look a the board. It might be time for you to remove the boards and try to fix them in a better way. The 2nd and 3rd picture look like your control board which is what can cause those problems. It appears to have some damage on it.

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Where should I start?

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You need to disassemble your TV and take the damaged board out. Remove the first board and tehn the control board. Keep track of what your do by taking plenty of pictures for your records. Once you remove the control board post some good pictures of that.

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