The game boots and plays but makes no sound, and the sound board test points show no 43 V or 12 V.

No sound from the AS-2888 sound board: repin, then check U11 and U8

Cause: First, a bad sound board connector (repinning brought the voltages back). Then a failed U11 counter chip (no pulse on its pin 11), with U8 also suspect.

Checks

• Measure the sound board test points for 5 V, 12 V and 43 V; repin the connector if they're missing.
• Measure each speaker: about 4 or 8 ohms is fine, an open reading means a dead speaker.
• Work through the board's signal path with a logic probe: U11 pin 11 should be pulsing.

Fix

• Replace U11 (the obsolete original can be replaced with a 7493 or 74LS93) and U8.

Systems

• Bally MPU AS-2518-17

Games

• Playboy

Related tips

• Sound board chip 86L93 can be replaced by a 74LS93
• Sound module -32 and -50 test points
• Game locks up after the seventh flash
• A display not working from MPU or sound board faults
• Never use a TMS2716 EPROM

Source: Pinball Repair help group!! (Facebook group)