Hi all,
I recently purchased a Sega Megadrive and a Sega Mega CD2 from ebay.
The CD2 was sold as 'untested' which seems to be the chosen word for all electronic devices where the seller doesn't have all the cables to power up and test the unit. The pessimist in me thinks the sellers know the devices don't work and in order to get a little more cash list them as 'untested'.
Either way I took the plunge and bought both as they were sold together.
Wellll... The CD2 doesn't work but that doesn't matter too much as the Megadrive does 
I took both consoles apart to give them a good clean and also to install a 60hz switch on the Megadrive. This is a pretty easy mod helps remove the top/bottom bars whilst also increasing the game speed to what was originally intended.
Video showing 50hz/60hz switch -
In opening up the consoles I noticed some crazy 'factory' mods. Was this normal practice 30 years ago or something unique to Sega?
It looks like the Sega CD2 could be a simple fuse issue which pops when the wrong power supply is plugged in.
I've ordered a 9v 1.2a power supply off ebay which is sold as a replacement for the CD2. My next job is going to involve bypassing the fuse with a wire to see if it powers up. (foolish?)
Am I correct in thinking that if I take a multi-meter to the motherboard and test some of the resistors, everything should report 0 if the main fuse on the board has blown?
Pics from inside both the Megadrive and the CD2 along with the switch I installed. (from research this is a VA6 which has the better Yamaha YM2612 sound chip)
- I've only added the black/yellow/red cables that go to the blue switch, the others were put in place by Sega
