Dec 142016
 

Although issues were different in these two repairs (well, quick fix more than repair), the cause was the same.

Here’s the first board, a Super Spacefortress Macross :

Board had issue on some backgrounds which showed colored blocks :

A visual inspection revealed a lift pin on a QFP custom ASIC:

Reflowing the pin fixed the game:

Second  PCB was a DoDonPachi :

with wrong music and sound FXs:

Also here the culprit was a lilfed pin (an address line, specifically) of the Yamaha YMZ280B-F (PCM/ADMPCM decoder)

Promptly fixed and sound 100% restored :

So, the bottom line is that you must always keep attention when you troubleshoot PCBs that use SMT devices, always check these for first…

 Posted by at 4:39 pm