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The PowerSupply caps looking good ... ... except the 56uF capacitor on the side that had leaked. I install some new electrolytic capacitors but not all of them ... Is there a schematic from the Sony IIsi PowerSupply?

replace it but nothing has changed ...

forgotten ...

I soldered the one ram on the Powersuppy connector a little messily because you can't get to it without unsoldering the connector, it doesn't look that great but it's okay

I think next is recapped the PowerSupply but my Voltagemeter say the +5Volt is fine ... But I do it. What surprises me is that the error sound takes a long time to appear. And when you plug in the power, the computer turns on immediately, which is strange ...

I recapped the Mainboard last Year with Tantal ones and all was fine. The PowerSupply is original and not recapped.

I have a IIsi that works before fine and now it take some time until the sound of dead sounds up. The motherboard looks good except for a little oxidation on the four 74ALS245 chips. I desoldered these all and cleaned everything up and checked connections and soldered on four new chips but the...

I think the Performa 475 has 512kB Video Ram build in and can be updated to 1MB in total so you can at two 256kB Module ...

I would like to build a null modem cable. Does anyone have the schematics for me between Quadra700 RS422 and PC RS232 9pin serial port ...?

Video are UA2 (RamDAC) and UA3 (Video Chip) I think ...

I also had the problem that the start sound was fine but the computer didn't bring up a picture onto the monitor and didn't boot. The reason was bad contacts (oxidized) on the video controller chip. New/re-soldered and now everything is good ... On other computer systems there are diagnostic...

... a little difficult because there are only three legs affected from the video chip. But it's been running for a whole day now ...

The video failed after a while again and this time I resoldered the two missing spots on the video chip and so far it seems to be working. The problem is that the oxidized areas cannot accept new solder even with a lot of flux !!!

unsatisfactory result It's working again, apart from cleaning a few via´s with isoproanol, I didn't do anything else. Power supply is fine

Cool ... Thanks

I have a Q700 with the fault there is no Video Signal Output. There is no sad mac sound so I think the mainboard is fine except the Video Out. The NVRAM battery wasn't leaking but the video chip has an oxidized spot on three legs and one spot was soldered. Need some tips what should I do with...