It is controlled by ALL_SYS_PWRGD, which is created from the power good signals of various power supplies.
-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
820-00034-A 2 led on, fan on, no chime/screen
- Thread starter yair37
- Start date
ALL_SYS_PWRGD requires various voltages, from S3 and even S0 state.
If PM_SLP_S4_L pulses (when trigger SMC_ONOFF_L), then S3 voltages must pulse too.
If first LED (S5) goes off/on when trigger SMC_ONOFF_L, SMC may detect some short/overcurrent on a secondary power supply.
If PM_SLP_S4_L pulses (when trigger SMC_ONOFF_L), then S3 voltages must pulse too.
If first LED (S5) goes off/on when trigger SMC_ONOFF_L, SMC may detect some short/overcurrent on a secondary power supply.
If S5 voltageas are steady, first LED must not blink.
S3 voltages may try to appear IF PM_SLP_S4_L pulses; you must check them for pulse at same time.
S3 voltages may try to appear IF PM_SLP_S4_L pulses; you must check them for pulse at same time.
If LED1 blinks, then S5 state is not stable.
Check for drop pulse at 12V_S5 and 3V3_S5, when pressing power button.
Use J5120 pads, instead of power button.
Be sure 12V_G3H is steady, not pulsing.
Check for drop pulse at 12V_S5 and 3V3_S5, when pressing power button.
Use J5120 pads, instead of power button.
Be sure 12V_G3H is steady, not pulsing.
they both drop pulse when i pressing(release) the power button.
12V_G3H 13v stable
How can drop 12V_S5, if you have bypassed Q6970 D-S?
Take it out again and bypass D-S and check again?
If you can't replace Q6970, then maintain the bypass.
Be sure no short on any secondary power supply.
Be sure no short on any secondary power supply.
Check if any other secondary power supply pulses at same time with 3v3_S5.
Start checking at L7650.
Start checking at L7650.
Any pulse at L7650, when you trigger SMC_ONOFF_L?
PM_SLP_S4_L pulses triggering SMC_ONOFF_L?