820-00165-A Green Light NO Power

[javier_herart]

Hello,

I have this 00165
Initial status:
-Liquid damage around R7523, R7520 and R7521 (Close to U7501).
-PP3V42_G3H shorted to ground due to bad SMC.

Repairs:
-R7523, R7520 and R7521: replaced
-SMC Replaced

Current Status
-PP3V42_G3H: 3.42V
-PPBUS_G3H: 8.60V
-PP3V3_S5_REG_R: 3.3V
-PP5V_S4RS3: 0V (I have 5V for 200ms)
-Green light for a moment and then orange light.

I alredy replaced U7501 and PP5V still 0V. (When replacing U7501 PP3V3 started to pulse, so I return the original U7501).

 

[javier_herart]

I forget to mention.

I tried with 2 different SMC from 00165 Boards and the same.

 

[2informaticos]

Do you get one, or two pulses at L7520, when connect charger?
Check at other big coils at same moment.
Can you catch pulse at L7520 when trigger SMC_ONOFF_L?

Try to start in SMC bypass mode...

 

[javier_herart]

After measuring what you mentioned I noticed I have 0.2ohm to ground on L7320 and L7310

-PPVCC_S0_CPU_PH2: I have 1.7v for 40mS.

Dead CPU? :/

Should I try Inject voltage?

Ultrasonic cleaner?

 

[2informaticos]

Wait 10-15s after power is removed and check again resistance to ground at L7310/20.

 

[javier_herart]

Same resistance afer 15s.

I removed L7310/20 to discard short on Q7311/21 and still have PPVCC_S0_CPU shorted.

 

[2informaticos]

Dead CPU then.
This board should have approx 8-15 ohm there; depending the CPU type and multimeter used.

 

[javier_herart]

Thanks for your support, 2informaticos. I will replace the complete board.