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.
Hey, buddy, I got this mac had oxidation in component u7400, replaces it. Probably the u6100 oxidized, too.
It doesn't spin the cooler, it's only safe green/orange.
PM_PWRBTN_L was 3.41V when triggering SMC_ONOFF_L dropped to 0.35V.
replaces u7400.
PP3V3_S3 / PP3V3_S5 3.36V;
PM_SLP_S0_L 3.34V dropped to 0.14V
PM_SLP_S3_BUF_L 3.33V no change when triggering
PM_SLP_S3_L 3.36V has dropped to 0V
PM_SLP_S3_R_L 3.36V has dropped to 0v
PM_SLP_S4_L 3.36 dropped to 0V
PM_SLP_S5_L 3.36V dropped to 0v
PM_SLP_SUS_L there was no change when triggering .
If you have steady PM_SLP_Sx_L signals, no need for trigger test.
The problem is that you didn't mention that.
PLEASE, POST ACCURATE and USEFULL information from beggining...
Do you get voltage on all big coils, including VCORE?
What about ALL_SYS_PWRGD?
You said PM_SLP_S5/4_L drop from 3V to 0V.
In fact should go from 0V to 3V when you trigger SMC_ONOFF_L.
What is the actual state of your board?
Do you have mentioned signals high?
Drop to 0V when you trigger SMC_ONOFF_L, or what?
Is very dificil to understand you, if do not post accurate information...
Why do you trigger SMC_ONOFF_L, if the board is already turned on???
This test is supposed to be used when the board is off.
Please, make use of logic.
All this happens because you do not explain correctly the symptoms.
When all PM_SLP_Sx_L signals are high, check which voltages appear on the big coils (secondary supplies).
Also check ALL_SYS_PWRGD.