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Been trying to repair a power supply that had me stumped for weeks. Replaced all the caps and was still having issues with very unstable voltages. The M51996P keeps restarting. After reading through the datasheet it looks like it's just a bad design. They are missing a cap across Vcc which is...

Got a bad power supply I'm trying to repair with 5V/-5V/12V all low and unstable. Electrolytic caps were all leaking so I've replaced all of them. Cleaned the PCB up and it's spotless now. Have also tested all diodes, FETs, voltage regulator and and they are all good. -5V: 5V: 12V...

Does anyone know if schematics exist for the M0420. I've searched every corner of the internet and can only find a schematic for the M1420 which is not the same as the M0420. The components and references are mostly the same but beeped out a few of the traces and compared to the M1420 schematic...

I've got a faulty Sony APS-06 PSU  which had leaky caps all over. I've replaced all the caps including the SMD's on the daughter board.  When shorting pins 9-10 the relay clicks on and then almost instantly clicks off.  (I'm trying to get the PSU working separately before connecting it back to...

If I can find the crystals and CPU I will give it a bash. Don't have much to lose. I've beeped out some of the bad looking tracks and so far so good but will need to check everything.   Will be a fun project to kill some time I have over the Xmas holidays :)  Getting a digital scope for Xmas...

A few hours of cleaning with vinegar and looking a lot better but you might be right. Its still going to be  a ton of work and finding spare components might be difficult   CPU pins completely gone so removed it. Also 3 crytals removed as they were also rotten. 

Bought a cheap IIsI from eBay (I wondered why it was cheap!) Horrible battery bomb and corrosion. Does anyone know if there are board layouts for the PCB. I've found the schematics but some of the component references are not visible and need to replace corroded components.  I've tried looking...

I"m also looking at building a few of these for a few mac's I've got lying around.  I can design and get the PCB made up with no issues and have lots of spare components lying around. Just  one thing I've never programmed before is the Cypress CPU.  (More of a Atmel man) What programmer did you...