Troubleshooting no audio output on a Philips mini hi-fi

[michalism]

Hello everyone and happy new year!
I’m trying to figure out why this mini Hi-Fi system does not play sound. The model is MCM239D, and I am attaching some pages of the service manual (due to size limitations).

Using a signal trace, I confirmed that there’s an audio signal on the input pins of the TFA, but I get nothing on it’s output.
With the power on, I’m measuring 0V on pin7, instead of something much closer to Vcc. I checked the components associated with that line and they all check ok.

Could this be a problem with the main microcontroler?

If I’m not mistaken, according to the datasheet of the TFA and the service manual, the microprocessor is giving the signal to switch-on the TFA, correct? I think it’s the “MCU18 /STDBY” labels in the service manual (pages 6-1 and 8-1).

Am I wrong so far? What else should I try?

Some more notes:
- I checked for shorts but I was not able to find any.
- The TFA9842BJ is new, I replaced it to eliminate the possibilty of the IC being broken
- Vcc is good.
- Q804 ans Q801 also measure ok with the multimeter.
- The input of Q801 is at 0.645V and that of Q804 at 0.976V (with respect to ground)
- However, the output of both Q801 and Q801 is at 0V DC. Is this normal?
- Diodes also check ok. I can’t check the zeners.
- There are no bulged capacitors.
- I can’t find R804 on the the pcb
- The voltage at T12 (STDBY) is 2.4 V.

Any suggestions?
Thank you so much in advance!!
Michalis