Hi, I have a Classic and Classic II. I have a problem with the Classic II analog board that I can't fix. It was leaking caps which I have replaced. The Molex connector on the HDD was reading 4.52 and 11.32 volts on the classic II analog board. On the Classic analog board they are reading 4.98 and 11.92 and both the Classic and Classic II logic boards are working fine with the classic analog board. So I know both logic boards are working. With the classic II analog board nothing appears on screen with the classic II logic board and with the classic logic board I get a checkerboard and the HDD doesn’t startup. So I gradually turned up PP1 watching the voltage (turn off, turn up a bit, turn on, check voltage etc), when it reached the maximum on PP1 it read 5.2 and 11.81. I turned it back a bit it to bring back to 5v, the HDD now starts up but nothing changes with the screen so obviously the 12v circuit isn’t enough to drive the logic boards.
What might be not allowing the 12 v circuit to get past 11.8v ? I have changed every Electrolytic Cap on the analog board except CP1 which I can’t find a replacement for, I have taken it off and it doesn’t look like it has leaked.
I don’t get a bong start on the classic II logic board on either Analog board but I am assuming that there is a bad sound circuit on the logic board given all caps had leaked on the classic II Logic board. It still boots up ok and reads the HDD on the classic Analog board.
What might be not allowing the 12 v circuit to get past 11.8v ? I have changed every Electrolytic Cap on the analog board except CP1 which I can’t find a replacement for, I have taken it off and it doesn’t look like it has leaked.
I don’t get a bong start on the classic II logic board on either Analog board but I am assuming that there is a bad sound circuit on the logic board given all caps had leaked on the classic II Logic board. It still boots up ok and reads the HDD on the classic Analog board.