I have a Neo CD toploader I got off eBay non working, basically the issue is that there is no picture when you boot the system with either composite or RGB scart lead (from the 8 pin DIN) connected.

I can hear the Neo CD boot screen sound through both connectors, and my PAL TV even 'jumps' into NTSC mode, as with all my working NTSC consoles - it looks like it is picking up the sync, so why won't it display any other image?

I have taken it apart, and from a quick look, I can't see anything obvious. Is the fault likely to be with the main board, or a problem with the connector board where the power and video sockets are?

All help appreciated.