retrofletch
n00b
- Joined
- May 27, 2023
- Posts
- 3
Spent all day with this and got nowhere so now im asking for a bit of help on where to look next
Board is NEO-AES3-6 powered with 10v dc center negative.
No matter what cartridge i put in i get only blue screen ( system OK ) but no game will load, no sound.
I believe its possible that it broke because cartridge was plugged in when console was turned on if that helps?
I have tried following.
Unibios - gives me white screen, can not access any menues or diagnostics.
Diagnostic rom 0.19 - all tests pass, with m1 rom cartridge and doing z80 tests it gives no audible beeps so ALL OK, if i dont run z80 tests i get beeps so i know sound generation works.
Also i get all the text and menues with diagnostic rom so i also know video out works to some degree, controller inputs work.
i have tried also replacing the z80 but it made no difference, traced out all connections between z80 and c1, d0 chips, seems OK.
So basicly, it will pass system check "blue screen", pass all tests in diagnostics, i do get audio and video out during diangostics but no cartridge works ( except for the m1 rom char board used during diagnostics, that works).
I really dont know where to look next.
Ive checked the obvious, pins in cartridge slots, solder joints, cant see any bad traces either but maybe its hidden, and like ive said, i have tried about 6 different cartridges so i dont think its bad contacts.
Any ideas?
Board is NEO-AES3-6 powered with 10v dc center negative.
No matter what cartridge i put in i get only blue screen ( system OK ) but no game will load, no sound.
I believe its possible that it broke because cartridge was plugged in when console was turned on if that helps?
I have tried following.
Unibios - gives me white screen, can not access any menues or diagnostics.
Diagnostic rom 0.19 - all tests pass, with m1 rom cartridge and doing z80 tests it gives no audible beeps so ALL OK, if i dont run z80 tests i get beeps so i know sound generation works.
Also i get all the text and menues with diagnostic rom so i also know video out works to some degree, controller inputs work.
i have tried also replacing the z80 but it made no difference, traced out all connections between z80 and c1, d0 chips, seems OK.
So basicly, it will pass system check "blue screen", pass all tests in diagnostics, i do get audio and video out during diangostics but no cartridge works ( except for the m1 rom char board used during diagnostics, that works).
I really dont know where to look next.
Ive checked the obvious, pins in cartridge slots, solder joints, cant see any bad traces either but maybe its hidden, and like ive said, i have tried about 6 different cartridges so i dont think its bad contacts.
Any ideas?