Quoted from Sonora70:
Got the new TDA2002 amp in yesterday and installed. Still no sound. I checked voltages on the + leg of C5 and C7 and still not getting good voltage. I ordered the TDA2002 amps (2 of them) from eBay because GPE is sold out. Any chance they could be bad? I still have an extra. Yesterday I put my head down toward the bottom of the cabinet and I "may have" heard a slight noise when I flipped the power switch. Nothing at all past that. Silent.
Still have not gotten the cap replacements. Any next steps?
TDA2002 is obsolete. You will have better luck looking for TDA2003 which is a replacement but still obsolete from STM. A lot of the STM parts you see on eBay are counterfeit but still work. I have read people say the counterfeit TDA2003 lack short circuit protection like the real ones do but otherwise ok. Not sure what to expect from TDA2002 marked stuff from eBay tho.
There is still a company in Taiwan that make legit good TDA2003 which is a drop in replacement. I have used plenty of them.
Have you checked TP4? When sound is triggered and should be playing noise TP4 should start to pulse and be flat 0v when no sound. If you get action on TP4 the CPU is probably running OK.
Then check TP6. When sound is playing you should see ~1 VAC there when sound in progress. If nothing there but you get action at TP4 replace the sound chip.