The game produces scratchy, fuzzy noise with little or no proper audio.

Scratchy, fuzzy sound with little audio: replace the TDA1543 DAC

Cause: A failed TDA1543 digital-to-analogue converter chip at U26 on the CPU/sound board.

Checks

• Check the board revision and software against the relevant service bulletin.
• If you have another board of the same type, try its DAC chip in place of U26.

Fix

• Replace the TDA1543 at U26 (fit a socket). Make sure the replacement is the serial-input version, as two different parts share that number.

Games

• Ripley's Believe It or Not!

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