-
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
820-00840-A not turn on
- Thread starter andrespi
- Start date
USB-C input voltage?
PPBUS_G3H, 3V3_G3H?
PPBUS_G3H, 3V3_G3H?
Check diode mode to ground at L6995.
Post D6905 voltages.
Post D6905 voltages.
So you have short to ground at L6995?
Remove R6999 and check where the short remains.
Remove R6999 and check where the short remains.
Which voltage did you inject?
Inspect under microscope all caps connected to 3V3_G3H.
If the short disappeared, shouldn't be an integrated circuit.
What is actual PPBUS_G3H voltage?
If the short disappeared, shouldn't be an integrated circuit.
What is actual PPBUS_G3H voltage?
Post basic voltages for U7000; P_IN, AUX_DET, VDDA/P, SMC_RST*, AUX_OK, A/BMON.
Also check BUF_SMC_RESET_L.
Also check BUF_SMC_RESET_L.
Remove F7000 and check C7050 voltage.
Seems that no communication between SMC and U7000.
You can try changing U7000.
If the previous short on 3V3_G3H was caused by SMC, is another explanation.
You can try changing U7000.
If the previous short on 3V3_G3H was caused by SMC, is another explanation.
That is another option, I said.
You can try changing U7000 first.
Also check all components, solders and traces around it.
You can try changing U7000 first.
Also check all components, solders and traces around it.
You should practice with scrap boards...