The sound board produces nothing, though the amplifier can be heard with the volume high.
No sound, only amplifier hiss with the volume up
Cause: A failed sound RAM: a 6116 on early boards, a 6116 or 6264 on later ones.
Checks
- Swap the socketed processor and sound chip with known good ones and verify the EPROM checksums first.
Fix
- Replace the RAM. On a 520-5077-00 a 6116 can be replaced with a socketed 28-pin 6264: fit W4 and remove W5 (W5 fitted with W4 out is for a 6116).
Systems
Related tips
- PIA LED lights, goes out, then lights again
- CPU still will not boot after the basics
- Battery voltage at the RAM but memory still lost
- Replace a failed 6116 RAM with a 6264
- Game stuck showing the last four high scores
- The CPU memory battery is built into a non-socketed RAM chip
- Logic chips worth stocking
- Game resets every two seconds
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)