Hello all ~
Hope this finds you well. This LG 82UN8570AUD (April 2021 model) 4K UHD television has full audio capabilities but video is compromised / problematic.
When I picked up this large LG tv it had a full black screen upon startup. Previous owner said it just went black one day. No popping sound or anything else of note.
I got the display to work by taping off several traces of the right-hand side ribbon cable on the TCON that leads from TCON to PANEL. However, despite dozens and dozens of attempts to find the right combination / range of traces taped off, no particular configuration led to 100% success.
Question is, based on the following information and accompanying pictures, is this most likely a TCON issue (solved with a replacement TCON board) or is it housed in the panel display itself?
Other info:
~ The power supply board, main board, WiFi, backlights, and audio (including Bluetooth functionality) all seem to be working perfectly fine.
~ Depending on the TCON trace tape-off configuration, I get a range of outcomes including full black screen, half black / half white screen, full picture but washed-out colors on left half of screen, normal coloration across the whole screen but then has overtly obvious horizontal lines (see pictures) and these lines are usually accompanied by faint but noticeable flashing of entire screen every 2 seconds or so.
~ I can get both the repetitive flashing and the horizontal lines to go away, but then the color is washed out on left-hand side of the screen.
~ When I do get the half black / half white, the white (left-hand) side is completely and quite uniformly white ~ leading me to conclude that the backlights themselves are a non-issue.
~ The half black / half white presentation only happens when I purposefully unhook one of the TCON's ribbon cables or if it doesn't close and lock fully after one of my change attempts.
~ Never do I get a half screen black (or white) with the other half functioning perfectly as is often the case with a faulty TCON.
~ It's apparent that the washed out colors begin at the halfway line and gradually get worse as you move to the left onscreen. There, at the vertical dividing line in the middle, the color washout is barely perceptible. But by the time you get to the left-hand side of the screen it is extremely washed out and, with certain trace configurations taped off, completely gray and void of any color. This "half and half" reality seems to lend credence to the faulty TCON theory.
~ It is at its worst in the lower-left hand corner (as evidenced quite clearly by the attached photos).
Hoping it's the TCON, of course, and there is quite a bit of evidence that points to that (especially the fact that the entire right-hand side of the screen's image seems perfectly normal).
Thanks for reading. Any advice or insights from previous experience(s) is very much appreciated.
Hope this finds you well. This LG 82UN8570AUD (April 2021 model) 4K UHD television has full audio capabilities but video is compromised / problematic.
When I picked up this large LG tv it had a full black screen upon startup. Previous owner said it just went black one day. No popping sound or anything else of note.
I got the display to work by taping off several traces of the right-hand side ribbon cable on the TCON that leads from TCON to PANEL. However, despite dozens and dozens of attempts to find the right combination / range of traces taped off, no particular configuration led to 100% success.
Question is, based on the following information and accompanying pictures, is this most likely a TCON issue (solved with a replacement TCON board) or is it housed in the panel display itself?
Other info:
~ The power supply board, main board, WiFi, backlights, and audio (including Bluetooth functionality) all seem to be working perfectly fine.
~ Depending on the TCON trace tape-off configuration, I get a range of outcomes including full black screen, half black / half white screen, full picture but washed-out colors on left half of screen, normal coloration across the whole screen but then has overtly obvious horizontal lines (see pictures) and these lines are usually accompanied by faint but noticeable flashing of entire screen every 2 seconds or so.
~ I can get both the repetitive flashing and the horizontal lines to go away, but then the color is washed out on left-hand side of the screen.
~ When I do get the half black / half white, the white (left-hand) side is completely and quite uniformly white ~ leading me to conclude that the backlights themselves are a non-issue.
~ The half black / half white presentation only happens when I purposefully unhook one of the TCON's ribbon cables or if it doesn't close and lock fully after one of my change attempts.
~ Never do I get a half screen black (or white) with the other half functioning perfectly as is often the case with a faulty TCON.
~ It's apparent that the washed out colors begin at the halfway line and gradually get worse as you move to the left onscreen. There, at the vertical dividing line in the middle, the color washout is barely perceptible. But by the time you get to the left-hand side of the screen it is extremely washed out and, with certain trace configurations taped off, completely gray and void of any color. This "half and half" reality seems to lend credence to the faulty TCON theory.
~ It is at its worst in the lower-left hand corner (as evidenced quite clearly by the attached photos).
Hoping it's the TCON, of course, and there is quite a bit of evidence that points to that (especially the fact that the entire right-hand side of the screen's image seems perfectly normal).
Thanks for reading. Any advice or insights from previous experience(s) is very much appreciated.
Attached Files
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