MacBook 13" 2017 820-00840-A Wateer Damage

[ohannis]

Hello,
I have received a MacBook 2017 820-00840-A it is not powering on due to water damage. where should I start diagnosing from ? when I plug the power in should I get power readings or i have to jump start it to get readings ? if i need to jump start what pins i need to jump start ?

Thannks

 

[dukefawks]

Where is the liquid damage? PPBUS_G3H present?

 

[ohannis]

U have checks U5420 Pin 4 and 3 for PPBUS_G3H there is no power reading there do i have to jump the system to get power?

 

[ohannis]

U8400 Is where most of the corruption is LP8548B1SQ_-04

 

[dukefawks]

U8400 is backlight IC, so nothing to worry about until PPBUS is back.

Voltage on F7000 and R7020?

 

[ohannis]

F7000 Has no Voltage
R7020 broke off when i touched it, what board uses the same R i can remove from to reuse ?
Pin 2 on R7020 is 5.25V

 

[dukefawks]

Only the newer board use those type of resistors, so from 00045 and newer. Get some donor boards 00244, 00875 or something.

 

[ohannis]

do you guys sell any ?

 

[dukefawks]

Ebay or Ali has them

https://nl.aliexpress.com/item/2016...ple-MacBook-pro-A1708-repair/32855537840.html

 

[ohannis]

i was referring to the cap i have seen these they will take forever to come

 

[dukefawks]

Just get some boards, I'm pretty sure you will need more parts from them.

 

[ohannis]

Jut got some Boards Replaced R7020 still there is no power on F7000 R7020 pin 2 has 5.25V. i think the PPBUS_G3H is not coming in. any comments ?

 

[dukefawks]

You think PPBUS is not coming on? Why not measure it?

Where was the original corrosion? Any around the CD3215 chips?

 

[ohannis]

Duke;
here are some readings
PPDCIN_G3H @R9920 Pin 2 has 5.3 volt
C6482 HAS ZERO VOLT
PPVIN_G3H_P3V3G3H 0.2 VOLT
R7075 HAS 0V

HOPE THIS HELPS IDENTIFY THE ISSUE

 

[dukefawks]

Voltages on R6906?