820-2915-B Green Light No Fan Spin

[Kyabbage]

Green light on charger, battery is present bot not charging. I'm very new to troubleshooting macbook boards and so far I've just been farting around probing voltages & getting nowhere in boardview. Any suggestions on where to start?

 

[2informaticos]

First of all, welcome to the forum!

Remove the battery and start process repair.
Do not connect battery, until get correct PPBUS_G3H voltage.

Check diode mode to ground at L7030.
Post basic voltages for U7000; pins 1, 2, 3, 6, 9, 12, 13, 14, 15 17, 19, 20, 27.
Also check exact resistance between pins 17/18 and 27/28; measured on ohm scale, no power.

 

[Kyabbage]

U7000 pins 1(6v), 2(16.4v), 3(0v), 6(3.41v), 9(0v), 12(3.47v), 13(3.43v), 14(2.24v), 15(0.06v), 17(1.48v), 19(5.09v), 20(5.09v), 27(0.9v). Between 17/18 (0.03ohm), 27/28(9.6k ohm). For L7030 I'm not sure which pin to check.

 

[2informaticos]

You have several problems there; try to fix all.

"3(0v)"
Missing ACIN, very important.

"27/28(9.6k ohm)"
Check R7020/21/22 abd their traces.

"1(6v)
------------
27(0.9v)"
Result of missing ACIN...

 

[Kyabbage]

R7020(0ohm across?) all traces good, 21(2k, Traces good), 22(6.5k, Also good). voltage on that rail starts at 1.4v but falls slowly to around 0.15v.

 

[2informaticos]

R7021/22 MUST be 10 ohm each!!!

 

[Kyabbage]

Ok now they are 10 ohm each, finally got a donor board in and replaced them.

 

[2informaticos]

Do you correcy get PPBUS_G3H now?
If not, post U7000 voltages again.
Also post actual resistance between pins 27/28.