The game only makes the synthesized chime sounds. Moving the chimes/modern selector switch on the sound card (with power off) makes no difference, even after recapping, swapping the sound ROM and PIAs, and checking the ROM jumpers.

Sound card plays only the chime sounds, never the 'modern' sounds: IC8 and IC9

Cause: Failed logic chips in the selector path on the sound card: here IC8 and IC9 (IC9 is the 4050 buffer).

Checks

• Test the selector switch with a meter.
• Check the selector-related jumpers on the card against the schematic.
• Check IC9 on diode test: all four logic pairs should read the same; use a logic probe on the related gates.

Fix

• Replace IC8 and IC9 (socket them). The original poster fitted good used chips from another type 1 sound card and the modern sounds came back.

Systems

• Williams System 4

Games

• World Cup

Related tips

• Sound EPROM files used by System 3-6 games
• Using the sound board test switch
• Powering a sound board for testing
• Type 1 and type 2 sound boards and their switches
• Wrong sounds play
• Intermittent sound: sockets and old ROMs
• System 3/4 sound board jumpers for 7641 PROM vs 2716

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