DarrenF
Well-known member
Couple of Konami Repair Logs - one easy, the other not
Konami Rush'n'Attack
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Symptom: sound very & scratchy, doesn't really respond to volume pot
Thoughts: bad electrolytic caps in audio section
Action: replaced about 4 caps
Result: now responds to volume pot, but still very low & a bit scratchy
Thoughts: bad amp
Action: replaced LA4460
Result: audio now good
Konami Super Basketball
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Symptom: dead, no activity on CPU R/W line after several seconds
Diagnosis: logic probing shows some RAM not being activated, found bad address decoding
Action: replaced LS32 @ J22
Results: now sometimes boots to badly botched (extremely blocky) gfx, but recognizable action (sometimes boots to solid screen)
Thoughts: bad EPROMs?
Action: pull and verify EPROMs
Results: all OK; no help
Thoughts: must be something bad in the (huge) gfx section
Diagnosis: found a bad logic chip in tile gfx section w/logic probe
Action: replaced LS86 @ E17
Results: gfx slightly improved (more horiz resolution present); still sometimes boots to solid screen
Diagnosis: found two bad more TTL ICs in tile gfx section with logic probe
Action: replaced LS86 @ F20 & LS273 @ E19
Results: tile gfx now fixed; sprites totally missing; still sometimes boots to solid screen
Diagnosis: problem in sprite section, duh... found no activity on RAS line of sprite RAMs
Action: replaced LS153 @ A17
Results: sprites now present, but messed up; only in 2nd and 4th horizontal quadrants of screen (the indeterminant state of the RAS line on the RAMs must have been causing the "blank screen" sometimes when it booted... which was the sprite hardware covering all the other gfx)
Diagnosis: sonofabitch, are you kidding me? much logic probing ensured...
Action: found and replaced questionable LS161 @ C15 (one output just didn't "look right" compared to the others)
Results: sprites fixed! Appears 100% now.
7 bad ICs?!? I'm just glad the customs were all good...
Konami Rush'n'Attack
-----------------------
Symptom: sound very & scratchy, doesn't really respond to volume pot
Thoughts: bad electrolytic caps in audio section
Action: replaced about 4 caps
Result: now responds to volume pot, but still very low & a bit scratchy
Thoughts: bad amp
Action: replaced LA4460
Result: audio now good
Konami Super Basketball
---------------------------
Symptom: dead, no activity on CPU R/W line after several seconds
Diagnosis: logic probing shows some RAM not being activated, found bad address decoding
Action: replaced LS32 @ J22
Results: now sometimes boots to badly botched (extremely blocky) gfx, but recognizable action (sometimes boots to solid screen)
Thoughts: bad EPROMs?
Action: pull and verify EPROMs
Results: all OK; no help
Thoughts: must be something bad in the (huge) gfx section
Diagnosis: found a bad logic chip in tile gfx section w/logic probe
Action: replaced LS86 @ E17
Results: gfx slightly improved (more horiz resolution present); still sometimes boots to solid screen
Diagnosis: found two bad more TTL ICs in tile gfx section with logic probe
Action: replaced LS86 @ F20 & LS273 @ E19
Results: tile gfx now fixed; sprites totally missing; still sometimes boots to solid screen
Diagnosis: problem in sprite section, duh... found no activity on RAS line of sprite RAMs
Action: replaced LS153 @ A17
Results: sprites now present, but messed up; only in 2nd and 4th horizontal quadrants of screen (the indeterminant state of the RAS line on the RAMs must have been causing the "blank screen" sometimes when it booted... which was the sprite hardware covering all the other gfx)
Diagnosis: sonofabitch, are you kidding me? much logic probing ensured...
Action: found and replaced questionable LS161 @ C15 (one output just didn't "look right" compared to the others)
Results: sprites fixed! Appears 100% now.
7 bad ICs?!? I'm just glad the customs were all good...
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