Oct 042018
 

Another shoot’em up on the bench and always a board coming from Portugal : Double-Wings produced by Mitchell Corp. in 1993 (but hardware is clearly marked Data East)

The board booted into game but had a color issue, the screen was all blueish :

The brief POST showed an error related to palette RAM:

After a quick look at PCB I pinpointed the palette RAMs is two 6116 (2K x 8-bit devices)

When I went to probe with my scope the lower one @5F I found some stuck data lines:

I pulled the chip and tested it out-of-circuit.It failed:

Installed a fresh RAM on a socket :

This fixed the issue and board completely.Another repair accomplished.

 

 

 Posted by at 9:37 pm