Hi, I'm trying to fix my monitor but it would appear that its something more serious than just bad caps or cold joints.
Monitor history:
I used it for about 6 years and then the monitor was stored unused for about 1.5 years in my room but now I wanted to use it as a small TV so I connected it to the tuner. It worked for a couple of hours and then it started to turn off and on a couple of times and then it stayed off (blue LED indicator still ON). I plugged it in the next day and it worked again but after about 2h it started to go black again.
What I did:
1. I replaced some of the caps that I had and re-soldered the connectors to transformers but no change. The monitor still turns off after some time.
2. Connected it to a PC - still nothing
It looks like there's no 12/24V from the power supply. But I don't know how to make sure and what to do with this information.
I don't know if this helps but when the monitor was working as a PC screen it was set to brightness 12% but now as I wanted it to work as a TV in a well lit room I set it to 100%. After it started failing I tried to go back to 12% but it didn't change anything.
TL;DR
Monitor turns off after some time
Blue LED is ON
Replacing some caps did not help
missing 12/24V?
I'm attaching some pictures with the voltage measurements that I took (all other boards were disconnected)
Also links to the IC datasheets:
https://lib.chipdip.ru/923/DOC000923326.pdf
https://www.promelec.ru/pdf/SG6901.pdf
Monitor history:
I used it for about 6 years and then the monitor was stored unused for about 1.5 years in my room but now I wanted to use it as a small TV so I connected it to the tuner. It worked for a couple of hours and then it started to turn off and on a couple of times and then it stayed off (blue LED indicator still ON). I plugged it in the next day and it worked again but after about 2h it started to go black again.
What I did:
1. I replaced some of the caps that I had and re-soldered the connectors to transformers but no change. The monitor still turns off after some time.
2. Connected it to a PC - still nothing
It looks like there's no 12/24V from the power supply. But I don't know how to make sure and what to do with this information.
I don't know if this helps but when the monitor was working as a PC screen it was set to brightness 12% but now as I wanted it to work as a TV in a well lit room I set it to 100%. After it started failing I tried to go back to 12% but it didn't change anything.
TL;DR
Monitor turns off after some time
Blue LED is ON
Replacing some caps did not help
missing 12/24V?
I'm attaching some pictures with the voltage measurements that I took (all other boards were disconnected)
Also links to the IC datasheets:
https://lib.chipdip.ru/923/DOC000923326.pdf
https://www.promelec.ru/pdf/SG6901.pdf
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