prodigy83
Member
It's not stable, it goes from 1.6v and drops to .900v, then back to 1.6v, then just continues this same cycle.
-
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
820-02382-16 stuck at 5v, no magsafe light
- Thread starter prodigy83
- Start date
So you have roblems on U5200 area.
Maybe some traces, solders, or components around it.
You may have problems with Q5230-33/40.
Maybe some traces, solders, or components around it.
You may have problems with Q5230-33/40.
prodigy83
Member
I took up all the capacitors for PPVBAT_AON_CHGR_REG, and I also cleaned up Q5240. Now I have a consistent 5.1v at C5250.
I however still get nothing @ R5330. The power is not stepping up.
P3V8AON_PWR_EN is 0v.
R5150 I get 1.9v.
SYS_DETECT is 0v.
I did have to remove J5150 because it broke off.
I however still get nothing @ R5330. The power is not stepping up.
P3V8AON_PWR_EN is 0v.
R5150 I get 1.9v.
SYS_DETECT is 0v.
I did have to remove J5150 because it broke off.
5V at C5250 can be caused by shorted MOSFETs.
Did you check all above mentioned?
Did you check all above mentioned?
prodigy83
Member
Yes, I am not finding any kind of short. I took the following measurement for voltage.
R5700 no voltage
c5702 no voltage
r5711 no voltage
r5712 no voltage
P3V8AON_VSENSE no voltage
PPVIN_P3V8AON yes voltage 5.259
Looks like voltage is going in to U5700.
I hope you've checked for short between MOSFETs pins, not to ground...
prodigy83
Member
I went back over the mosfets, I was originally having lots of problems with Q5240 and sure enough you were right, pins 1 and 2 were shorted, I replaced this mosfet. I got the 28v on the magsafe and all is booting up! Thank you very much!