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MacBook A2338 820-02020

I

iFix

Member
I have this A2338 it was liquid damage in multiple places on the board. I removed the corrosion, resoldered all broken connections, and rewired some. The laptop is powered on but the backlight comes on for only 1sec and turns off, and still running and boots up on external. I replaced UP800, QP801, and QD530 cause there was corrosion around them and I rewired the broken lines. I also rewired RC100 and RC120 cause they were damaged. I'm getting voltage up to QP801 pin 5, but no transfer to the other side of QP801, only 1-2v, and drops completely.

Any suggestions?
 
I

iFix

Member
Yes, I tried a brand new LCD. It shows a picture with the backlight normal for a second and then loses all
 
I

iFix

Member
UP710 measurements

pin 1 VDD 1.8v stable not losing voltage
pin 2 LCD_PWR_EN I get 1.8v and loses voltage when it's going to flash the logo
pin 3 PMU_SYS_ALIVE 1.2v stable not losing voltage
pin 4 EDP_PANEL_PWR_EN 1.8v and then losing voltage
pin 10 EDP_PANEL_DISCHARGE stable at 1.8v
pin 11 EDP_PANEL_1V8_EN 1.8v and then losing
pin 14 EDP_BLC_5V_EN just 1.8v and losing

UP710 i already replaced
 
I

iFix

Member
PP3V3_SW_LCD_CONN 3.3v but it drops
LPDP_INT_HPD 1.1 v and it drops
RP620 no corrosion all clean there
 
2informaticos

2informaticos

Administrator
Staff member
Then image disappear too, is not just backlight problem.

Corrosion affects more things.
Possibly accumulated crap under some BGAs.
 
I

iFix

Member
Yes as usual. I replaced also UP710 because there was around it some liquid damage. Also there was some corrosion on the Audio circuit, but not sure if that can affect the image and backlight.
 
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