Macbook Pro Retina 820-3332 Instant Death after powered USB plugged in. PLEASE HELP!

cryptopher

New member
820-3332 is now dead, I get no light on the charger. The board does not increase in temp. I got 20v coming in from my 85w adapter and g3h is active at 3.42v,,. I am fairly new to this so any info given in dummy format would be much appreciated. someone mentioned the USB power rail but I cant seem to pin point.

Thank you so much in advance.
 

2informaticos

Administrator
Staff member
Post diode mode (red probe at ground) at L7030.
Also for L7220/60 and the other coils.
Check for short (or low value) to ground on USB power and data lines.
 

2informaticos

Administrator
Staff member
"L7030 0.0424v"
Are you sure it is not close to 0.400-0.450 instead???

"L7220 gives me a beep at 0.018v"
That is too low.
I hope you've disconnected power when measured diode mode.
Also allow 10-15s after power is removed.

"usb power lines???"
Post diode mode at pins 2/6 of U4600.
 

2informaticos

Administrator
Staff member
5V_S5 looks bad too.
Few things connected there.
Check again disconnecting trackpad.
Also check for short on 5V_SUS.
When you get 5V_S5, go for 5V_S4.

Don't forget, PPBUS_G3H is first required.
 

cryptopher

New member
U5010
pin 1: 3.431v
pin 2: 0.000v
pin 3: 3.431v
pin 4: 2.776v
pin 5: 2.446v
pin 6: 2.421v
pin 7: 3.432v
pin 8: 3.344v

L7030: diode mode 0.420v
voltage mode plugged in 12.12v
 
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