Last night I was doing my daily google search on Sega Neptune discussions and came across a really interesting thread on digitalpress which spoke about the Neptune mod I've been attempting.
The information in the thread caught my interest for 4 reasons :
• 1 : It had the guy who originally successfully made a Neptune and wrote the guide I've been following posting info in there. So the information had weight to it.
• 2 : A person in the thread was attempting the mod and on completetion got very very similar results to me. No games booting (megadrive or 32x) but the TV picking up a signal from the Neptune but only showing a black screen.
• 3 : The above person, the Longhorn Enginneer ( • 1) and another knowledgeable guy mentioned that standard HDD IDE ribbon cable is too thin to carry the 32x / Megadrive signals across them which could be resulting in the lack of boot and the black screen
• 4 : The guy who on completion of his Neptune got my problems made a 2nd Neptune using Ethernet wiring instead of IDE and got it to work perfectly.
Admittedly he used a different Megadrive 2 and 32x when making the Ethernet wiring version which cancels out the fact his 32x could be faulty. But it shows that the wiring used is better for the 32x to Megadrive 2 connection.
I've now gotten hold of some nice Gigabit speed ethernet cable and stripped the inner 8 wires out and I'm going to be de-soldering all 64 wires on my Neptune and re-soldering with the new thicker gauge wires.
I'm keeping very level headed about it that this still might not fix the Neptune but I'm excited to try it out.
I've also figured out why the power wiring has a joint soldered to a seemingly blank area of the Megadrive's main board. If anyone else is attempting to follow the walk-through and wondered why the power wiring is placed in such a way, as there is no explination. Its to move the wiring off to the side of the actual power supply input point. Otherwise the wires tend to get in the way of the port and you cant plug the power adapter in. Rather than doing the solder joint I will just hot glue gun the wire I think as this will be a bit easier to do than soldering to the board and stronger possibly.
Anyway, enough of my train of consciousness haha.
I'm going to start de-soldering this weekend and re-connection. Also I've been adding more milliput to my replica Neptune case. Its still a long way from completion but the shape is definetly there now :D
More updates soon