The Toshibas of that era also used a TA7176 or TA7176P Sound IF chip - we replaced several - GEIC-2/ECG712/NTE712 is the replacement. Not saying that is your problem, just another no sound component.
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Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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