Symptoms: 1) Game would start fine then sound would become scratchy and humming.
2) Battery would lose settings not keeping charge.
Repair:1) Repaced 8 faulty caps in audio section of bottom boardset.Four 100uf16v caps
and four 220uf16v caps were repaced.These were checked using ESR meter.
2) Repaced the dead rechargable battery with a watch type battery on the bottom
side of boardset making for easy changing of battery in future. Desoldered the
charging resistor to do the mod which is a 470 ohm resistor next to battery.
3) Cleaned cart pins and edge connectors.
Tested for an hour playing multiple games of Puzzle Bobble, Mark of Garu, Samarai Showdown, Magical Drop III, and Windjammers with no more sound issues whatsoever. High scores are also now being saved again.
2) Battery would lose settings not keeping charge.
Repair:1) Repaced 8 faulty caps in audio section of bottom boardset.Four 100uf16v caps
and four 220uf16v caps were repaced.These were checked using ESR meter.
2) Repaced the dead rechargable battery with a watch type battery on the bottom
side of boardset making for easy changing of battery in future. Desoldered the
charging resistor to do the mod which is a 470 ohm resistor next to battery.
3) Cleaned cart pins and edge connectors.
Tested for an hour playing multiple games of Puzzle Bobble, Mark of Garu, Samarai Showdown, Magical Drop III, and Windjammers with no more sound issues whatsoever. High scores are also now being saved again.
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