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820-01521 is stuck on boot, no shorts anyway, stuck on 5v 70ma. no heat signature anywhere including T2 except for the cd3215 that its connected to.
PPBUS_G3H 12.2V
LDO on the PMU for SLP/awake all present. including 3v3.
injected 1.8v to force_DFU but does not seem to work. out of ideas now
Hello, I have a 820-02020 with history of water damage. Motherboard was not affected in anyway, backlight film needs replacing but customer did not want to pay.
2 months down the road, macbook is back with not turning on fault. upon inspection, L7800 is burned and U7700 is shorted. Replaced...
no history other than it just suddenly died.
yes tried SMC reset as well.
i thought PLT_RST_L signal indicates that BIOS loadout is complete and CPU is talking to EFI? anyway i will try finding for the a clean BIOS first
i have a 820-3478 which Fan spins but don't chime and only black screen
first 2 LED lights up,
CPU Vcore 1.7V
GPU Vcore 0.8V
PLT_RST_L 3.3V
no shorts detected
is this GPU issue? resistance on gpu core is 20ohms same goes to CPU as well.
ok further updates,
When nothing is connected to board only screen, SMC bypass shows which showing low battery sign.
but when kb and tp is connected during smc bypass, i get high fan spin, and nothing after that.
no different with another battery, mac is not booting.
any ideas?
low battery sign appearing on known good LCD, my guess is the orignal LCD is dead. but that does not explain why it does not boot
will try a battery first, but i thought the a1707 did not need a battery to boot and with battery i can't do smc bypass?
Hello, got a 00928 come in as water damaged but upon checking, liquid never hit the board. most on the LCD connector. nothing seems burned. diode reading on backlight output and MUX data pins are good.
right now macbook does not boot fully, no backlight or image either, using an external...
i have a 820-2879 that runs extremely slow, i have removed everything except LCD and still the same
takes 15 mins to show folder logo without HDD, i can't get into ASA cause either its stuck or takes forever.
no liquid damage on board. and i dun think there is ME to clear for this model. any...
Hi,
this macbook came in as dead. i unplugged battery and it boots with charger, but i'm getting critical error, unplugged all everything except for the LCD and still getting same error but able to boot into safe mode.
upon motherboard inspection, saw caps resisters around the T1 area is...
update. i manage to fix this. So keypoint is that it USB C works 1 side and not the other. U7860 was the culprit. for the others if USB not detected, check u4520 and u4400. u7860 and u7865 for the flip side.
The only I can get it to boot now is injecting 5v into pp5v_s0. That ways everything seems to work perfectly fine, I'll post diagnostic and hwmonitor soon
so smc bypass is, remove battery, hold on power button and plug in charger? is that right even for type c models?
and board is totally clean. no liquid spill. no small corrosions as well