820-00850 PPVCC_CPU 0V

[No-Clean]

Board came from another shop, was water damaged and they clean it.

2 CD3215 were bad, after replacing those I now get 20V and based on the amp meter looks like the board is booting, with battery connected the board charges the battery, but at no point I get USB activity.

Restoring/reviving in DFU completes with no errors but no booting still.

Board alone takes and seats around 0.155A CPU heats up a bit after a while.

ALL_SYS_PWRGD 1.8V
PM_SYSRST_L 3.3V
PM_PCH_PWROK 3.3V
PM_PCH_SYS_PWROK 3.3V

PPVCC_S0_CPU 0V

 

[2informaticos]

Do you get L7270 voltage?

 

[No-Clean]

Sorry I forgot to post that, yes 1V

 

[2informaticos]

Any idea which areas affected by liquid (apart of USB-C)?
Post diode mode to ground at L7210/20.

Inspect for knocked off components, broken/corroded traces.

 

[No-Clean]

They cleaned it very well, but I can see that around CC700, L7660, L8410 and CD32s there was liquid damage.

Diode on L7210/20 is 0.003 red probe on ground, in Ohms I get 3.2 on both coils and when I short probes I get 0.9ohms.

 

[2informaticos]

Doesn't look like short; should be good to compare with good board anyway.

Liquid sign to backlight circuit is not good.
Overvoltage can easy damage data lines on the board.

L8100/02 voltage present?

 

[No-Clean]

Diode on L7210/20 is same as good board, already tested.

L8100 1.2V
L8102 0.960V

 

[2informaticos]

Possibly CPU internally damaged.

 

[No-Clean]

Thanks a lot, this week Ive had a few boards like this, sucks!