Got a Sega CD from someone, was told all it needed was a simple fuse repair. Looks like something blew, I cannot read what part it is its so bad. Anyone have an idea what part it is? And if this is fixable? Almost every capacitor is corroded making it hard to read. Anyone know a part number and if its able to be replaced? The corrosion looks kind of bad If this isn't fixable is it possible to gut another non-working Sega CD and part them together? Thanks
There's almost 100% of chance the next faulty console you buy to gut will also have the leaked capacitor problem. :shrug:
There is a thread over on Digital Press that details how to fix the power supply. Apparently there is a small component somewhere in there that goes kaboom.
http://www.digitpress.com/forum/showthread.php?t=130014 This one correct? It shows this repair: I have these left over from another mod http://search.digikey.com/scripts/D...lang=en&site=us&keywords=478-5741-ND&x=5&y=15. Can I use these? The thread said the value of the cap isn't important since they just filter, but I would rather be safe. What is going on with the blue wire? Also the slight small wires coming from the cap on the right are just to fix the VIA there?
You don't really need to repair the traces or replace the capacitors. They're there just because of FCC regulations (propagation of EMI generated internally to the console.) The parts you really want to test/verify are the LM7805 chip, the green transistor close to the power connector and the green fuse part close to the green transistor. Also check if the filter coil (the black part the two capacitors connect to) is not damaged as if it is damaged, current won't flow into the console. :thumbsup:
Fixed the Fuse and capacitors on that board. Now I just need to replace all the other ones on the other board. Looks like 10.uF 16v capacitors or am I wrong?
Correct. :thumbsup: Also don't forget to clean the board. I suggest that you remove the backup battery (carefully) then proceed to wash the digital board with soap and an soft brush. It's ok to soak it on water. Just remove the screw and metal plate that hold the transparent light diffusers for the LEDs. An solution of 50% vinegar 50% water is good to null the basic corrosive material that the capacitor left on the board. Wash it well after and dry with an hairdrier on hot position. :thumbsup: As long you don't power the board while it's humid no damage will happen. The only thing you can't wash that way on the unit is the optical pickup... :lol:
Does this part look sufficient? http://search.digikey.com/us/en/products/EEE-1CA100SR/PCE3878CT-ND/766254
For the digital board, looks like a perfect match (surface mount electrolytic capacitors). :thumbsup: For the analog board (audio + power supply) you can buy normal radial (2 leads on the same side) capacitors. I suggest full capacitor replacement (replace even the ones that did not leak yet) and that should give another 20 years of life to the system. ;-)
Some of the pads are damaged from the corrosion is there alternative points to solder them to? I can take pictures of the board if that helps
If they're bypass capacitors (power supply capacitors) you can scratch the traces nearby and use them. you can also gang them at the nearest point of the board where there's another bypass capacitor. It's important that the board total capacitance is at least nearby of the original value. So if you miss a pair of capacitors or put two more it wouldn't be too bad. :shrug: I'd suggest you check if the digital board is actually working (does it boot to the SEGA-CD dashboard ?) before going through all that trouble. :thumbsup:
