Hi everyone!
To start, thanks for reading!
I have sound, but no picture - sometimes
Pink banding - sometimes
It presents like this:
Starting from a cold startup, TV turns on (with picture/sound) every time. However, sometimes I have pink banding.
The pink banding will either stay, or randomly go away / come back while watching the tv.
Eventually the tv image will fail, but there is still sound. Once this happens, the TV will not power back on if I use the remote or power button to turn it off and on. I have to unplug it from the wall before it will turn back on, but it comes right back on every time. Sometimes with pink banding, sometimes not. Repeating this process, the tv runs 15-30 min before failing.
Misc info:
I see no cracks in the screen. No pops or other weird sounds or behaviors. TV will also come on after being warmed up with picture and sound every time, unless it failed and went dark(sound, no picture). If that happened, you have to unplug it and plug it back in. The TV picture seems to fail faster if I am watching a movie or anything with movement. Still images last a long time before the set turns off.
I attached a screen shot of the pink banding.
History:
Tv failed in past, had sound but no picture. Was repaired by unknown tech, presented same problem a month later. TV sat for 18 months, and now I have it. I am trying to get in touch with this tech, but I may not be able to get details.
I have the Fast Track troubleshooting manual and I plan to crack the thing open and check voltages tonight.
ANY hints or things to look for would be great! I am an EE student and I want to learn as much as I can. I am open to fixing/diagnosing the board one piece at a time. I have a volt meter and a good understanding of soldering and volt meter use. I suspect this is a power supply issue or something with the y-main.
To start, thanks for reading!
I have sound, but no picture - sometimes
Pink banding - sometimes
It presents like this:
Starting from a cold startup, TV turns on (with picture/sound) every time. However, sometimes I have pink banding.
The pink banding will either stay, or randomly go away / come back while watching the tv.
Eventually the tv image will fail, but there is still sound. Once this happens, the TV will not power back on if I use the remote or power button to turn it off and on. I have to unplug it from the wall before it will turn back on, but it comes right back on every time. Sometimes with pink banding, sometimes not. Repeating this process, the tv runs 15-30 min before failing.
Misc info:
I see no cracks in the screen. No pops or other weird sounds or behaviors. TV will also come on after being warmed up with picture and sound every time, unless it failed and went dark(sound, no picture). If that happened, you have to unplug it and plug it back in. The TV picture seems to fail faster if I am watching a movie or anything with movement. Still images last a long time before the set turns off.
I attached a screen shot of the pink banding.
History:
Tv failed in past, had sound but no picture. Was repaired by unknown tech, presented same problem a month later. TV sat for 18 months, and now I have it. I am trying to get in touch with this tech, but I may not be able to get details.
I have the Fast Track troubleshooting manual and I plan to crack the thing open and check voltages tonight.
ANY hints or things to look for would be great! I am an EE student and I want to learn as much as I can. I am open to fixing/diagnosing the board one piece at a time. I have a volt meter and a good understanding of soldering and volt meter use. I suspect this is a power supply issue or something with the y-main.
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