The TA-SA100WR unit has S-Air mode. Stopped working suddenly in 2022, December .
The main home theatre unit DAV -DZ 870 is working nicely and its front display shows S-Air on when music is playing. But the wireless amplifier has the following problem:
1. Front Green power LED was not getting on and there was no sound from 2 connected speakers.
2. On opening the unit, the power supply card was checked and +32v dc and other voltages were ok with respect to the ground. Assuming the power supply PCB is in ok condition, I arranged for a replacement amplifier PCB ( Sony replacement part A-1433-491-A), Amplifier card no 1-875-376-12. country of origin, Sony China .
3. I could fit the new PCB without any problem including all harness wiring.
4. The problem is still not solved. Now, when switched on, the front GREEN LED switches on for about 2 seconds only and then switches off with a small dc capacitor discharge sound [ blop sound] from one of the speakers. But there is no music output .
5. I have checked the pairing mode and tightened and cleaned all connections. Also, checked the speaker terminal impedance with a DMM. Nothing is visible.
6. It appears, the amplifier is switching off for protection.
I have the service manual of this unit including the PCB schematic drawings .
Please advise, anyone with prior experience of Sony amplifier repair, on how to repair this unit .
Thanking in advance for a correct advise.