820-02098 no sound

[ajdoc]

There was small liquid damage on UR660.
Replaced that and still no sound.
IC is getting hot under thermal camera.

Don't have access to know working board.

Values around UR660:
PPBUS_AON_SPKRAMP_ABC_ISNS 11.96V
PP3V8_AON 3.79V
PP1V8_AWAKE 1.79V
PP1V2_AWAKE 1.22V

CR668/1 3.48V
RR662/1 0V
RR663/1 0V
CR669/1 3.48V
RR664/1 1.79V
RR661/2 1.79V
RR660/2 0.49V

CR662/1 0.5V (on other two amps I got 1.2V) and 0.290 in diode mode (other two amps got 0.525 in diode mode).

Diode mode values with UR660 removed on pads on the board:
1 - OL
2 - OL
3 - OL
5 - OL
6 - OL
7 - OL
12 - OL
13 - 0.430
14 - 0.435
16 - 0.317
17 - 0.303
18 - OL
19 - 0.560
20 - 0.135
21 - 0.301
22 - 0.310
23 - 0.305
25 - 0.350
26 - 0.297
27 - 0.289
28 - 0.222
29 - 0.310
30 - 0.420

Any idea?

 

[2informaticos]

Very likely M1 data lines afected by leakage from PPBUS_AON.

Do you get headphones sound?

 

[ajdoc]

"Do you get headphones sound?"

Yes

 

[2informaticos]

Check SPKRAMP_RESET_L level.