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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
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.
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...
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.
ntg, PS get stuck at 5v and no response after that,
so i tried ejecting 3.5v on pp5v_s4 and p5vs0_en both at the same time, and i'm able to get 3.5v output on pp5v_s0, which means chip is working. there must be something else causing dropping power. thinking might be 5v sense line.