LyonsArcade
Well-known member
Hi guys;
I have a nintendo Sanyo 20EZ monitor that I keep having trouble with. I've replaced all the caps, the flyback, the hot, the voltage regulator (IC601) and the current limiter, Q901. I also had a broken resistor, the BIG one right next to the B+pot that I replaced with a in spec one from a parts board.
Anyways, the problem I'm having is that the monitor will come up and look great, with the B+ sitting at about 107.6. If you leave it on for a while, eventually it goes into overcurrent protection and the B+ rises to 135 or so, and can't be adjusted. If you turn the monitor back off and then back on, it'll half and half come back up with the right B+, and half the time it'll come up in over current protection.
Everything meters out making good contact in the 600 section, is there another section of the board that could cause it to do that? Per Dokert's Flow Chart suggestions, I've got the three brightness controls centered and the picture looks pretty good.
One thing I've noticed is that the resistor directly beneath the White ceramic resistor in this section of the board (it looks like about a 5W) is slightly higher in resistance (10%) than the one in my parts board, could that have anything to do with it?
I have a nintendo Sanyo 20EZ monitor that I keep having trouble with. I've replaced all the caps, the flyback, the hot, the voltage regulator (IC601) and the current limiter, Q901. I also had a broken resistor, the BIG one right next to the B+pot that I replaced with a in spec one from a parts board.
Anyways, the problem I'm having is that the monitor will come up and look great, with the B+ sitting at about 107.6. If you leave it on for a while, eventually it goes into overcurrent protection and the B+ rises to 135 or so, and can't be adjusted. If you turn the monitor back off and then back on, it'll half and half come back up with the right B+, and half the time it'll come up in over current protection.
Everything meters out making good contact in the 600 section, is there another section of the board that could cause it to do that? Per Dokert's Flow Chart suggestions, I've got the three brightness controls centered and the picture looks pretty good.
One thing I've noticed is that the resistor directly beneath the White ceramic resistor in this section of the board (it looks like about a 5W) is slightly higher in resistance (10%) than the one in my parts board, could that have anything to do with it?