Dreamcast power supply troubleshooting...

[tmcw]

Hi guys,

Currently trying to troubleshoot a couple of bad DC PSUs, and wondering if there are any good guides to checking through the board to try and pinpoint what components are causing the voltages to drop?

I realise that it's quite easy to make a harness to connect to an ATX PSU to replace the DC's PSU board, but since individual components are from only a couple of cents/pence to a couple of €/$/£, it would be great to bring these back to life.

Or any components likely to fail more than others? Caps are likely candidates, but if there were a few points through the board that could be verified, that would isolate the issue to specific parts of the board.

A schematic would be great, but I haven't been able to find one. I did come across a site/forum where they were discussing doing it, but it seems to have died off.

http://www.dcemu.co.uk/vbulletin/archiv ... 58804.html
http://dcemulation.org/phpBB/viewtopic.php?f=31&t=91864
http://web.vtc.edu/users/cph11120/dream ... matics.htm

[Hobie-wan]

Do you have a working one handy? If it's the same revision you could measure a point on the good one, then on the bad and compare to help narrow down.

[Beak]

I have no clue about that stuff, but I'd be glad to read your results if you figure it out!