D10p has a capacitor across it,any idea why that cap was install there?
The output FETs have four banks,one bank has shorted FETs due to broken legs i thinks.HIP4080 drives them,is it ok to replace only that bank?
As long as you keep all of the parallel FETs matched, you could probably replace only those in the group with broken legs. The exception would be where the gate leg broke, causing the FET to remain on, stressing the others in the same half-bridge. In that case, you'd need to replace all in that half-bridge. I don't know what FETs cost there but here, they're too inexpensive too risk replacing just a few. I'd replace them all in the audio circuit.
I buy from them often but sometime i need to finish a repair fast and don't have
enough so i get them local.
Across the speaker terminal i see 0.543mv.I did not change all in the half bridge yet.
Could this be why am seeing this offset ?
I used IRF1010E with 47ohm gate resistor and the FETs get warm fast.Also one particular FET was heating up faster than the rest.Drive signal is clean.I try 100ohm on just that FET and it seem more stable.I don't understand why just one heat up faster.All have same date code.
The DC offset is controlled farther back in the circuit. If the amp produces clean audio, the DC isn't likely due to the outputs. Isn't there a DC offset pot?
Sometimes FETs will have slightly different thresholds and one will heat up more quickly. Since all are heating, the problem is likely in the drive circuit. If you have a clean signal to the gates of the FETs, there could be a problem with the 494.