kjchatman1
Member
this board had a food spill and was thoroughly cleaned. the amp meter reads 5v 0.000a. i haven't found any shorted caps but did find a missing pp1v8_slps2r.
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820-01987 missing pp1v8_slps2r
- Thread starter kjchatman1
- Start date
Check diode mode to ground on all small coils around U7800; compare with good board, if possible.
T2 requires all AWAKE and SLPS2R voltages to start working.
What about actual PPBUS_G3H and 3V3_G3H_RTC?
T2 requires all AWAKE and SLPS2R voltages to start working.
What about actual PPBUS_G3H and 3V3_G3H_RTC?
kjchatman1
Member
ppbus is 12.3 and 3v3_g3h_rtc is 3.3
"Check diode mode to ground on all small coils around U7800; compare with good board, if possible."
???
???
kjchatman1
Member
i get no continuity on L7813 or L7815. the others have continuity
I expected to get some readings...
kjchatman1
Member
I lifted the two coils and they were visibly broken. the metal was still left on the padding. i've replaced them and now it's 20v on the amp meter and the ampage keeps cycling from 1.03a and back down to 0. ppbus keeps cycling from 12.68 to 10v but that's because the battery is charging slowly. when pressing the power button, the backlight on the display stays on even though there is no cpu vcore
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Is the machine recognized in DFU mode?
kjchatman1
Member
i tried to put it into dfu mode but it might have a bad keyboard
Force it in DFU with SE032...
kjchatman1
Member
it goes into dfu mode with the keyboard method. It gives the "waiting" error message. why would those two coils be broken like that? that area was closed in with a medal shield that i had to remove
No idea.
I recommend to test with known good battery and original 87W charger.
I recommend to test with known good battery and original 87W charger.
kjchatman1
Member
i'm using a 87w apple charger and the battery is charging so it must be good. i'm checking the coils around the pmic. pp1v_prim is 0v and ppvpcore_s5 is 0v. should they show up now or later?
Did you try revive, or restore?
SSD voltages come on?
SSD voltages come on?
kjchatman1
Member
i've tried revive and restore. which voltages are for the ssd?
Take a look at page 81.
Also check G3S voltages.
Also check G3S voltages.
kjchatman1
Member
all the nand and g3s voltages are there but it still goes to 20v and 0.000a without battery and with battery it tries to charge and then resets. It looks like some of the solder balls under the t2 are combined from the spill
Mentioned broken coils may point to some T2 damage...