SYSTEM32 sound problem

[waiji]

View: https://www.youtube.com/watch?v=CheYl23PnNw

I bought a SYSTEM32 board that had a sound problem.
Repetitive noise is played continuously and no sound effects or BGM are played.
5V and 12V are normal, and I double-checked that the IC35 and IC31 EPROMs were burned correctly.
I have replaced the Z80, HM65256 memory, 74F240, and MB3771 marked with a red square, but the same symptom is still present.
Please let me know which parts are worth replacing.

 

[advans14]

How does the amp feel?

 

[waiji]

The amplifier connected to the speaker is normal. Other boards sound good.
If you see the same noise playing repeatedly even when connected to system32's 'CND' connector, it seems that there is a problem with one of the components related to sound processing.

 

[waiji]

I solved it myself.
I discovered that the data line connecting the 315-5385 to the sound ROM was defective and replaced the 315-5385, and the sound came out perfectly.