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VectorGlow
17th June 2009, 04:50 AM
Symptom: No sound, but sound amp okay
Diagnosis: Noticed that when going into the self test and doing a ROM Check the two mask ROMs for the samples at 1D and 1F were never being tested – the test seemed to skip those, so it tested the rest of the ROMs and put up ‘OK’ with a checksum, but never put up a checksum for 1D and 1F or even an ‘OK’. Played the game and checked the schematics and found no address or data line activity on those ROMs. The addressing comes from the surface mount Konami custom ‘053260’ at location 3E and the inputs to this chip were good, just no output. So had to replace the chip with one from another Konami board of that era, then the sound worked perfectly.
Cure: Replaced faulty ‘053260’ Konami custom chip at location 3E

Womble
17th June 2009, 09:45 AM
What do you use for SMD work? How do you know what are the inputs and outputs of those customs too?

VectorGlow
17th June 2009, 06:27 PM
What do you use for SMD work?

ChipQuik for SMT removal:

http://www.chipquikinc.com/

and a temp controller iron with small tip and solder braid for wicking off excess solder when attaching the replacement part. Works a treat, looks neat too. :)


How do you know what are the inputs and outputs of those customs too?

In this case, nice and simple - I look at the schematics that I downloaded for The Simpsons. :) Unfortunately not all games of this era (and later) have available schems, and that's where the problems REALLY begin ............

Womble
18th June 2009, 10:15 AM
and a temp controller iron with small tip and solder braid for wicking off excess solder when attaching the replacement part. Works a treat, looks neat too. :)


Nice - got any piccies?

VectorGlow
18th June 2009, 06:39 PM
Not yet, but hope to take some in the next few days. :)