820-01598 water damage no backlight

yair37

Member
was bad damage no U8400 and around i was clean and make some jumpers.
PP5V_S0_BKLT_D - 5V
BKLT_EN_R 0V
PP5V_G3S 5V
BKLT_SCL 5V
BKLT_SENSE_OUT 0V
LCDBKLT_FB 0V
BKLT_PWM_KEYB 0V
XW4810 MISSING..IMPORTENT?
BAD U8400?
 

yair37

Member
sorry but it was my mistake...r8431 was missing. i put it back..sitll to wire between D8410 and R8431?
D8410
PPVIN_SW...to where?
and ppvout_s0...to where?
sorry i just dont see how they connect..
 

2informaticos

Administrator
Staff member
Do you have continuity from R8431 to D8410???
Their pins are marked in schematic/boardview, use a buzzer to check...
 

2informaticos

Administrator
Staff member
Then XW8410 is good.

You should try changing U8400.
Be sure all solders and traces are good.
May need to replace all surrounding resistors.
 

yair37

Member
UPDATE:
finally there is back light...but now its stuck on apple logo for 1-2min and fan goes high and shout down.
was enter it to DFU mode try to revive and its stuck on 90% load and give error 1.
there was also very tiny water damage near U5802 there was just one damage line that make a jumper.
 

2informaticos

Administrator
Staff member
If no data on SSD, then try DFU restore, instead of revive.
If you need to recover the data, start in Target Disk mode and check if can get access to SSD.
 
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