Who fixes Neo Geo boards around here?

shawnbo42

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PM me, please. I've got one that needs repair. It's a 4-slot (not that it really makes a difference), turn the machine on, and it comes up with a green screen with some random garbage on it. Even with all the carts out, it won't even come up with the grid pattern.
 
channelmanic seems to be the man you are looking for.
 
Yup... stuck on green is a calendar error.

You have a leaking battery. Take it off and check the traces under it and around it for damage.

The D4990 clock calendar chip has one of the following problems in order from most to least common:

  • No +5v going to it. Look at pin 14.
  • Clock crystal is dead (32.768KHz crystal)
  • One of the traces carrying data to be read/written are damaged.
  • Chip is bad (VERY rare issue)

The +5v comes through the backup battery circuit so if there's corrosion around that circuit you'll end up with no power to the chip.
 
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