No sound, though +5, -5, +12 and -12 V are all correct.

No sound with all voltages present: the PALs

Cause: One of the custom-programmed PAL16L8 chips at U19 and U20.

Checks

• Check the voltages, RAM and EPROMs first.

Fix

• Replace U19 or U20 with correctly programmed parts.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• No sound though sound board voltages are fine: unreadable sound ROM
• Check the sound board's regulated -5 V and +5 V
• Sound board versions are not interchangeable
• The 520-5050-00 sound board variant
• Data East and Sega sound boards by game
• No sound at all: check the -5 V regulator
• Loud hum from the speakers
• Sound board power input connector CN2

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)