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Another check, i have readed in other similar post with similar problem, i have disconnected ground from my line cord, and the voltage measured on hdd connector now start at high value, but, on 5v rail i measure 5,00 volt, and in a 12v rail i have measuerd 12,8 volt, i thinks so this 12v,8 volt...

In the meantime I tried to turn on the mac without the logic board, and it seems that without the voltages they are ok. This is really very strange, yet the logic board works and it is with new capacitors!

OK i try this, i have replacement for DP4, on schematic is an 1n4148 zener diode, then i have buyed CNY17-2, it's ok this or is wrong code? Schematic says only CNY17. Thanks

I kept the mac on for 1 hour, the voltage on 5 volts stabilized on 5.19 5.22 volts without ever resetting, but screen remained to vibrate. Then I switched it off and on again after 1 minute, the 5 volt spike marked 5.34 volts for the first 10 seconds and the screen was stable, then the voltage...

Hummmm..... false alarm! After changing the components that I described in the previous post, I kept the mac on for some time without any problems, I also turned it off and on several times without encountering problems on the 5v and 12v voltages, it was always perfect, stable and when turned...

Hi to all, thanks for support, the mac now is perfectly working, i have replaced capacitor C40 (.022uF) with wrong value when hot, then i have replaced all electrolityc capacitors on analog board. For my prevent, i have replaced LM317T and TDA4605 and zener DP3 1n4148 (in the vicinity of the...

ok i try to replace optocupler cny17, in the same area of this i have two little electrolityc capacitors, i don't have replaced it! Try to replace it before optocupler because i don't have it's now, i need to order. Then, the screen verbation, tipically vertical vibration, is possible a non...

Hi to all, again with a questions and sorry for my english. I have buyed a Mac Classic computer (probably 2mb because it have a little ram board connected on the logic board but without sim inserted and jumper setted on SIM NOT INSTALLED). The system not boot up and the screen turn on with a...