A2179 / Board 820-01958 - liquid damage, 5v- loop 54 -0 54 ma

[samstown]

Hi,

I got this board, water on the right side, not on CPU side, corrosion on recto/verso.

I get

PPBUS_G3H = 12.27
PP3V3_G3H_RTC = 0V


Thanks
Sam

 

[2informaticos]

"water on the right side"
Audio board affected by corrosion on both sides?
Also check audio flex and connectors.

Post diode mode to ground at 3V3_G3H_RTC.

 

[samstown]

Thanks. By right side, I meant on USB-C connector side. nothing on audio/jack board

Diode mode to ground at 3V3_G3H_RTC = 0.400

 

[2informaticos]

Post U6960 basic voltage; pins 11, 12, 10, 13.
Use surrounding components as test points.

 

[samstown]

Thanks. One cap is shorted. I'll replace it.

 

[samstown]

Hello,

Ok, I've replaced all shorted cap.

U6960 10, 11 & 12 = 12.29V
13 = 0V

Thanks

 

[2informaticos]

Check R6960...

 

[samstown]

Thank you, was short. I don't see the value of that resistor. How can I know what resistor I can take to replace it ?

btw I've read another poste to check if T2 is still ok, R6401 (PIN1) SPKRAMP_RESET_L, diode mode to GND =0.351, that mean T2 should be ok.

 

[2informaticos]

"was short"
What was short?
The resistor itself MUST be short (between its pins); is 0 ohm resistor!

Do you get voltage on its both pins?

 

[samstown]

I get 0 V. Where can I see it's a 0 ohm resistor, need another schematic?

 

[2informaticos]

Missing enable signal.
May have a problem with U7000; try changing it.

The resistor value is marked on the schematic...