Quote:
Originally Posted by bigboss80
I double-checked all the capacitors I replaced to make sure I didn't get any polarity wrong and they are all correct, then I also checked for any fractured tracks near the capacitors and I found only one, the one that connects the positive of the large 160 Volt 100uf capacitor, it wasn't completely disconnected but touching it disconnected it, I reconnected it properly but still nothing changed, I disassembled the screen trimmer and cleaned it with contact deoxidizer and tested with an analog multimeter and it works fine. I tried tapping the connectors but nothing strange can be seen, the image is always stable, I also re-soldered them with new solder, even the tube socket.
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When I said the screen pot, I meant the one that is permanently attached to the flyback and cannot be taken apart; those get loose inside sometimes and become very flakey. You should check that it isn't wildly loose and that it doesn't cause the brightness to jump when you move it around a tiny bit.
Sorry that reflowing the connectors didn't help. It's a common cause of these kinds of sudden issues and is fairly low-hanging-fruit in terms of effort, so it's still best practice to do this.
Did you try to re-balance the brightness with the background and drive pots? If you can do that, then maybe it's just fine and you're worrying for nothing.