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this machine come in dead. theres something to do with all sys pwrgd not showing, so I remove q8150. now machine turn on.
a few weeks later customer say macbook cannot connect to device. i use my known good cable to my device, its charging but itunes doesnt detect device.
I have discard all part...
hi, this came in with ppbus 8.2v
i changed smc straight away, ppbus go 8.6v, machine turn on.
a few days later,customer came, the machine is dead again.
I see ppbus_g3h is 4v,sometimes 0.5v.
I remove fuse, and I have 8.6v at pin 1. so it must be system side ? do i check for short one by one?
hi, this board came in, pretty clean.
pp5v_s5 stable 5v
pp3v3_s5 3.3v but cycling.
I notice ppvrtc_g3h diode mode is 0.030 or so (70 ohm), I found one caps which is leaking.
now diode mode is 0.104 ( about 200 ohm resistance to ground ). ppvrtc voltage is 3.2v
I compare to 3435...
smc_lid is 3.4v stable.
after sleeping for a while, board would not have backlight when i open the lid.
part problem has been ruled out as I put the board on my known good housing.
smc has been reballed.
u9701 is replaced, with a5 jumper to pin 2 of d9701
lvds has been replaced too.
any pointer ?
board came in with symptoms : plug magsafe, fan spin for 1 second, stop. then spin for 2-3s, and loop like that
no corrosion found.
r7402/03 measured good.
when fan is spinning, all_sys_pwrgd and vcore is present.
removing ram will cause vcore to be stable, and fan doesnt cycle at all ( board...
this came in botched from another store without smc.
Replaced smc, and i got green light now., but board still not turning on.
pp5v_s5 : 5v
pp3v3_s5 : 2.9v ( strange )
ppvrtc_g3h : 2.9v ( strange too)
ppbus_G3h : 12.6v
I have tried replacing tps, but still no luck.
any pointer ? thanks..
Hi, this board came in with no magsafe light. I track down the problem to u7000, q7030, and q7035. replaced all, and magsafe green light come.
a few days later customer came back, no green light. i see ppbus is 12.2v. I have tried replacing smc 3 times.but still ppbus 12.2v and no green light. I...
820-4924 no backlight.
liquid damage at q7701. shorted inside the board at PPVIN_SW_LCDBKLT_SW, so i dig out the short, now resistance is good at 0.4kohm
fuse is good 12.6v at both side
ppvout is 12.6v at pin 1 of lvds connector.
i have bklt_en_R 3.3v
I use known good must be working 2015 lcd.
Hi, ,this board came in with corrosion near smc and thunderbolt ic, there's a short on ppbus_g3h near u6901, at the thunderbolt stuff, anyway , i clean the corrosion and dig out the short, ppbus came in at 12.3v
I already test the smc at known good board, and i know the smc is good, i also...
hi, this board came in, sign of flux here and there
ppbus is 12.3v, no magsafe light
immediately tried changing smc, but still same.
i tried his smc to my board, and it work ( orange light and ppbus 12.56v)
so im sure smc is good, i have tried replacing isl too, but still smc is not running...
hi this board came in with not charging, solved by replacing r7051/2.
found out bil connector is bad,but even with KNOWN GOOD bil attached,fan will spin but no boot (blank display),
if i unplug bil it will boot normally. sponge has been removed, bil looks good,
sda scl diode mode is 0.455 and...
this macbook came in alive, but cursor is staggering, and macbook is slow, fan maximum,
i run asd 3s155 os version, and see that TA0P ambient air sensor is failed
smc have greenish thing near it, and i already reballed smc but still the same, i can't seem to locate ambient air sensor location..
this came in, no visible liquid damage, but whole board is dusty
ppdcin is 16.5v normal
pp3v42 present, but no green /orange light.
adapter sense up to pin 2 of j6900 is normal 3.4v,
ppbus is 1v
resistance between pin 17/18 :4 ohm
27/28 is 20 ohm
smc_reset_l is 2.8v at first,after I reball smc...
hi this came in with no backlight problem, I have 0v on ppvout_sw_lcdbklt but no short.
12.6v at bothside of fuse, while probing around, i realize, now if Icd is connected, fan would spin a bit, then stop. ( not turning on )
but if I remove lcd, fan will spin forever..
pp3v42 present, but no smc_bc_acok
i have 3.9v at u7000 acin
resistance between pin 17/18 is normal at 3 ohm
but resistance between 27/28 is too high, the trace from pin 27 of isl to pin 2 of r7022 is good
the trace from pin 28 to pin 2 of r7021 is good, but i probe between 27/28, the resistance...
lcd cable is broken, c9715 is broken in half, i removed it, but there's a short but not full short, about 20 ohm.
I then proceed to remove c9709, c9799, c9795 and c9717. But there's a short ? about 50 ohm, does that mean there's still leakage ?
i cannot inject voltage like this, is my best bet...
no visible water dmg / corrosion
pp3v3_s0 2.9v ??
pp1v8_s0 : 1.2v ??
pp1v05 : 1.05v
pp5v_s3 : 5v
all_sys_pwrgd : 0v
there's a bit of high pitched noise around u1800 or its back near smc, i couldnt pin point the exact noise
I have tried replacing u2700, u7770 and u7780..