JustAnotherGuy
Member
I have a 820-2915-a (2011 MacBook Pro 15) that was running a memtest86 when it spontaneously shutdown. It will not start up again. The power connector stays green, even though the battery is at ~10% charge.
SMC reset does not work.
SMC bypass does not work.
Left battery disconnected overnight, then plugged in power cable: no fan spin.
Plugged in after disconnected all peripherals from logic board except fans: no fan spin.
No water damage.
Logic board was replaced by Apple maybe... 4 years back? For GPU failure.
Probed the following:
PPDCIN_G3H - 16.7V
PPBUS_G3H - 12.5V
PP3V42_G3H - 3.48V
PPVRTC_G3H - 3.4V
PP5V_S5 - pulsing 0-5V ~2Hz
PP5V_SUS - pulsing 0-5V
PP3V3_S5 - pulsing 0-3.5V
PP3V3_ENET - 0V
PP3V3_S5_AVREF_SMC - 3.3V
PP3V3_S5_SMC_AVCC - 3.5V
PP3V3_S5_EN - pulsing 0-3.5V
SMC_PM_G2_EN - pulsing 0-3.5V
S5_PWRGD - pulsing 0-3.4V
SMC_RESET_L - 3.4V
SMC_ADAPTER - pulsing 0 - 3.46V
PM_SLP_S5_L - 0V
G3_POWERON_L - 0V
My best guess is SMC or TPS51980? Any ideas if I am on the right track / have the right issue nailed down? I don't want to blindly jump into replacing the SMC if I don't have to... it looks like a pain.
Thanks.
SMC reset does not work.
SMC bypass does not work.
Left battery disconnected overnight, then plugged in power cable: no fan spin.
Plugged in after disconnected all peripherals from logic board except fans: no fan spin.
No water damage.
Logic board was replaced by Apple maybe... 4 years back? For GPU failure.
Probed the following:
PPDCIN_G3H - 16.7V
PPBUS_G3H - 12.5V
PP3V42_G3H - 3.48V
PPVRTC_G3H - 3.4V
PP5V_S5 - pulsing 0-5V ~2Hz
PP5V_SUS - pulsing 0-5V
PP3V3_S5 - pulsing 0-3.5V
PP3V3_ENET - 0V
PP3V3_S5_AVREF_SMC - 3.3V
PP3V3_S5_SMC_AVCC - 3.5V
PP3V3_S5_EN - pulsing 0-3.5V
SMC_PM_G2_EN - pulsing 0-3.5V
S5_PWRGD - pulsing 0-3.4V
SMC_RESET_L - 3.4V
SMC_ADAPTER - pulsing 0 - 3.46V
PM_SLP_S5_L - 0V
G3_POWERON_L - 0V
My best guess is SMC or TPS51980? Any ideas if I am on the right track / have the right issue nailed down? I don't want to blindly jump into replacing the SMC if I don't have to... it looks like a pain.
Thanks.