chaoticjelly
Kabuki Klasher
- Joined
- Sep 30, 2006
- Posts
- 128
Hey all,
I had this Neo Geo AES which wasn't loading any games. Despite being sent by its original owner to a well known shop that does repairs here in the UK, it was returned with no work being undertaken. The diagnosis was possible faulty BIOS (as it had a piggybacked UniBios in socket), and water damage to two "SM Semis" (what are those?).
When I tried it, boots up to blue screen only (hardware test OK).
Anyway I checked out the mainboard and after about 5 minutes I spotted the broken trace below, which was just above the cartridge slot.
I used my multimeter to determine which cartridge port pin the trace was from, and where its destination should be. It was from cartridge port pin 10A, to the Toshiba TMP68HC000N-12 CPU pin 62.
I connected the two points with a piece of kynar wire, and now the system loads cartridges just perfectly.
Also added a 75 ohm resistor to each of the R, G and B lines since they had none, and the intensity of the signals would be a bit too high on an RGB SCART equipped television without them.
Hope this helps anyone else with a similar issue.
Cheers,
CJ.
I had this Neo Geo AES which wasn't loading any games. Despite being sent by its original owner to a well known shop that does repairs here in the UK, it was returned with no work being undertaken. The diagnosis was possible faulty BIOS (as it had a piggybacked UniBios in socket), and water damage to two "SM Semis" (what are those?).
When I tried it, boots up to blue screen only (hardware test OK).
Anyway I checked out the mainboard and after about 5 minutes I spotted the broken trace below, which was just above the cartridge slot.
I used my multimeter to determine which cartridge port pin the trace was from, and where its destination should be. It was from cartridge port pin 10A, to the Toshiba TMP68HC000N-12 CPU pin 62.
I connected the two points with a piece of kynar wire, and now the system loads cartridges just perfectly.
Also added a 75 ohm resistor to each of the R, G and B lines since they had none, and the intensity of the signals would be a bit too high on an RGB SCART equipped television without them.
Hope this helps anyone else with a similar issue.
Cheers,
CJ.
I gave him £20 + delivery.