For a couple of days now, the monitor doesn’t want to run on full brightness anymore. If I go up to 95%, it runs if warm, but might not start up. Set it to anything higher and it comes on for a couple of seconds and then shuts down the back-light completely. The image is still there though.
Oh, if you value your life, PLEASE unplug the mains cable and make sure the HV capacitor is empty. Always check the voltage with a suitable multimeter first. Only then you may think about touching it.
The discoloured power supply doesn’t give me too much confidence. It seems to be one of the two transformers for the CCFL high-voltage, but I might be wrong. Does it overheat because the CCFLs pull to much current, or is something else awry? Planned obsolescence at work again? At least the capacitors are not the cheap 85°C ones, as far as I can see.
There seems to be more to it than just bad capacitors, but at least I found and replaced one. Unfortunately that didn’t cure the issue, it got a bit worse. Now it shuts off the back-light at even lower brightness levels.
The CCFL plugs are nasty little buggers. HV plugs with retention clips. I had to use pliers to get them out.
LCD logic board
I might have a go at checking / replacing all the other capacitors on that board and if that doesn’t fix it I might even try replacing all of the CCFL tubes, which might be the root cause of this. Maybe these things pull more current when they get old. I don’t know. All I know is that I’m looking at further repair costs of about 50+ bucks or so, and it’s not even guaranteed to work. A new LCD monitor of comparable specs but 16:9 would cost me about 165-ish.
For now I think I’ll run this one until it breaks down completely or doesn’t provide sufficient brightness anymore.