I have the very first shot of a japanese Mega-CD 1. But one day without any reason it stop working.
After long search, I did not find where is the failure. When I powering up the Genesis I have a blank screen, however the tray start to close (when it's open). No BIOS screen, no sound.
- All fuses are OK
- power\sound board works (I tested it on another MCD)
- all leads are good
- the BIOS works to.
The issue may come from the interface board between Genesis and Mega-CD. It use a cable plug directly on a crystal oscillator on the MCD motherboard.
But I can't test the motherbord on another MCD because it's specifics.
I took some pics for understanding :
The motherboard parts side
The motherboard solder side
MB Memory chips
crystal oscillator sub board
sub board connector
interface board part side
interface board solder side
closer view of interface board's chips
closer view of solder side + grey cable
closer view of solder side + black cable
It would be nice if someone can save this first release of this Mega-CD. Plus, his BIOS is not zoned. It works on both 50Hz and 60Hz Genesis.