820-3787 liquid damaged - no power.

Alan.L

Member
boards looks clean.

ppbus_g3h - 2v
PP3V42_G3H - 0V
PPDCIN_G3H - 1-2v both side
smc_bc_acok = 0v

what i need to do from here, i've never work on this model.
u7100 area looks fresh.

every few minutes the MagSafe will flash green light and fan move a little for a spit second.

ISL =
7/18 = 3.1 omhs
27/18 = 20 ohms
 
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Alan.L

Member
mmm, it post using battery power, i can hear keyboard sound. but no images nor backlight. can charge battery with orange light but no green light.
 

Alan.L

Member
now has green light,orange light, fan spin with a magsafe. need to fix no video.

12.57v on both side of lcd fuse
 

Alan.L

Member
nothing showing up on external monitor via hdmi and displayport.

can i test with a 13" 2014 lcd?

SMC_LID is low - 0v
 

jadao

New member
SMC_LID should be high, at 0 voIt, SMC thinks the lid is closed so no backlight pwm resulting in no backlight boosting.
Check if SMC_LID signal is not shorted to ground, pulled down by an open resistor or bad trace.
Also water may have corroded the hall sensor J5250.
 

Alan.L

Member
C9327's pin1 is burnt
c9323's pin1 is dark
r9115's pin1 is slightly burnt but still 34.8K

dead gnu?


PPVCORE_S0_GFX is gpu vcore right? 0.858v
P3V3GPU_EN - 3.3v
 
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Alan.L

Member
i used hot tweezer only. hopefully, they were shorted. i'll give it a test. i'll let you know if occur...
 
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