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Dear all, I’m the happy owner of a Macintosh SE M5011 first version with the 800k floppy and internal 20SC which luckily badged as well at its back. Unfortunately I’m not able to have it booting despite of trying different ram simms combinations that were tested well on my other SE Fdhd...

Hi everyone, I’m trying to bring a 650 back to life. I already read different treads about but didn’t found answer or similar issue. so it’s turning on, green led lighting, hard disk spinning…. but no bong and black screen… I have a 4mb stick that run great on the LC3 and a new pram battery...

just received a dead se30 with dead roughly repaired motherboard. Any chance to build a new one? what would be the price in the end ?? thanks

thanks a lot again for your help. I guess they are very common/standard diodes ? Any idea to test the optocoupler ?

So I've rechecked and between pin 4 and pin 6 I've almost NOTHING AC !! but only 11,2V DC ! maybe it could help to diagnostic even I cannot understand we are AC on this side after the diode bridge (newbie I am!) Besides, * how could I check QP1 optocoupler ? I have an oscilloscope if needed. *...

Hi bibilit, Voltage between pin4/ground and 6/supply voltage is AC ? and not DC? thanks

Hi again, In the meantime I've checked supply voltage between pin4 and pin6 of the TDA4605 and found about 11,15V DC which I think is correct ? Thanks again for your kind help

Thanks a lot spending time to help me. Very much appreciated. I don't know how to copy/paste in a new post, maybe a moderator will do for us ? So, I've just found a CR-44 schematics but seems this is not exactly the same...at least components haven't the same names :-(...

Hi there, I hope I can use this thread... I've got exactly a same issue with a Mac Classic. No power at all, no screen, no fan nothing when I switch on. I've recapped already a part of the PSU but still nothing. I would like to know from where I must start for voltage controls, control points...