Hi Guys
My 50" LG Plasma recently started playing up. Having tried my luck with it and getting no-where I've decided to turn to this forum for help.
The TV is 5 years old and about a month ago, decided to start turning itself off. It went into a repair shop and stayed there for 2 weeks. They returned it saying they were unable to replicate any faults.
After being fine for about a week(it never turned off), it developed a new fault. This time we lost the left 3rd of the screen to multi coloured lines (bars) filling the screen from top to bottom. I opened the TV and tried to find the fault myself. This is the view inside
Initial appearance looked fine (nothing burnt or blown, no exploded caps). I dusted everything off then tried finding the problem. I found a video on YouTube saying to look for bad connections, and another suggesting to find dry solder joins. Found that if I bent the logic board a bit, it interrupted the lines on screen. Being a complete novice, I followed a cable from the logic board down to a screen buffer. It seemed logical that the buffer board which was directly behind the lines on the screen, must have had something to do with causing it. So I proceeded to purchase a 2nd hand logic board (Eax54875301) and buffer (EAX54872201) from eBay. When they arrived, I eagerly fitted the logic board. This made no difference and still had lines on the screen. Then fitted the buffer and still the screen had lines. Completely baffled and frustrated, I started messing with anything possible while the TV was on to see whether I could affect the lines. When I came to the AV board, I was able to make the lines go away and produce picture again. Only, instead of filling the screen with picture, I was missing about 4" picture from the left. (2" Black and 2" wrong colour) Here's an Example
Someone has told me, that because i seen lines similar to the lines below, that the Plasma Screen itself is faulting and it wouldn't be economical to repair. Is this true? (The lines have gone away)
I found a replacement AV board, and the person selling it advised me that my problem was the YSUS Board which was faulting, and there was no need to buy a AV board. Can anybody verify this ? Is there anyway I can test either?
Further Research suggested checking the ribbons on the buffer boards.
I proceeded to remove the end ribbon on the affected side and now instead of having a 4" problem ... I only have a 2" problem
I'm now at a point where I'm not sure whether its the Screen, a buffer, the AV board or YSUS board.
If you are by any chance able to help me figure out what the problem is, or how I could further troubleshoot my beast, I would be forever grateful
Thanks a stack
My 50" LG Plasma recently started playing up. Having tried my luck with it and getting no-where I've decided to turn to this forum for help.
The TV is 5 years old and about a month ago, decided to start turning itself off. It went into a repair shop and stayed there for 2 weeks. They returned it saying they were unable to replicate any faults.
After being fine for about a week(it never turned off), it developed a new fault. This time we lost the left 3rd of the screen to multi coloured lines (bars) filling the screen from top to bottom. I opened the TV and tried to find the fault myself. This is the view inside
Initial appearance looked fine (nothing burnt or blown, no exploded caps). I dusted everything off then tried finding the problem. I found a video on YouTube saying to look for bad connections, and another suggesting to find dry solder joins. Found that if I bent the logic board a bit, it interrupted the lines on screen. Being a complete novice, I followed a cable from the logic board down to a screen buffer. It seemed logical that the buffer board which was directly behind the lines on the screen, must have had something to do with causing it. So I proceeded to purchase a 2nd hand logic board (Eax54875301) and buffer (EAX54872201) from eBay. When they arrived, I eagerly fitted the logic board. This made no difference and still had lines on the screen. Then fitted the buffer and still the screen had lines. Completely baffled and frustrated, I started messing with anything possible while the TV was on to see whether I could affect the lines. When I came to the AV board, I was able to make the lines go away and produce picture again. Only, instead of filling the screen with picture, I was missing about 4" picture from the left. (2" Black and 2" wrong colour) Here's an Example
Someone has told me, that because i seen lines similar to the lines below, that the Plasma Screen itself is faulting and it wouldn't be economical to repair. Is this true? (The lines have gone away)
I found a replacement AV board, and the person selling it advised me that my problem was the YSUS Board which was faulting, and there was no need to buy a AV board. Can anybody verify this ? Is there anyway I can test either?
Further Research suggested checking the ribbons on the buffer boards.
I proceeded to remove the end ribbon on the affected side and now instead of having a 4" problem ... I only have a 2" problem
I'm now at a point where I'm not sure whether its the Screen, a buffer, the AV board or YSUS board.
If you are by any chance able to help me figure out what the problem is, or how I could further troubleshoot my beast, I would be forever grateful
Thanks a stack
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