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[SOLVED]820-2610-A Green Light but does not turn on

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veejay

New member
Hello,

I'm new to board repairs and I need your help. I have a MacBook Pro 17" 2009 with an 820-2610-A motherboard that has a green light but it does not turn on. It does not have any signs of water damage, and besides of a few scuffs and dents it looks alright. The customer told me that it simply didn't want to start anymore, as I said no liquid or major signs of mechanic accidents.

When I took the board out and connected it to the charger I saw smoke coming out from Q4260 so I have removed it. His father has a construction company and has a FLIR camera and with that I saw that U7000 was the "hottest" chip from the motherboard, in fact when connected to charger was the only one hot or rather warm (40°C).

I have a few measurements :

PPBUS_G3H - 3.11V
PP18V5_DCIN_ONEWIRE - 17V
PP3V42_G3H - 3.41V
SMC_PM_G2_EN - 3.4V

Still learning so I may write something dumb or ask stupid questions ... so please be patient.

Also I have another board (820-2330-A) with the exact same problems (green light but does not turn on, no liquid damage) but I can't find the brd file to take some measurements, maybe you can help me with it.

Thanks !
 
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dukefawks

Administrator
Check voltage on C7771, it should be 1.05V. If not then replace C7771, can be a bigger regular cap, just wire it in there. This is the same for both boards.
 
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veejay

New member
Plugged it in today and no green light, PPBUS_G3H was 0,02V, ONEWIRE was very low also. Leaved it plugged, done a few phones and noticed it was green again without doing anything. C7771 is 0V, PP5V_S3 also 0V, ordered today some caps and will try to replace it tomorrow but something is fishy. I saw on Louis's video that he had 8.37V on PPBUS_G3H, mine is 3-3.4V.
 
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veejay

New member
R7020 - 17.07V
R7021 - 17.07V
R7022 - 17.07V
C7021 - 17.07V
C7022 - 17.07V
C7020 - 17.07V

U7000 (ISL6258HRTZ) pinout :

1 -
2 - 16.8
3 - 4.01
4 - 3.18
5 -
6 -
7 -
8 -
9 - 0.03
10 - 3.4
11 - 3.4
12 - 3.4
13 - 0.05
14 -
15 - 0.03
16 -
17 - 0.86
18 - 0.4
19 - 5.09
20 - 5.09
21 -
22 -
23 - 0.57
24 - 0.52
25 - 4.8
26 -
27 -
28 - 0.44
 
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veejay

New member
Replaced ISL6258, when connected to power Q4260 (I have replaced it too) went into flames again :) I have 8.4V on G3H now and 1.10V on C7771, still it doesn't turn on.
 
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veejay

New member
That was it, I was using the the 65W. It booted :) This is my first board repaired, you can mark it as solved. Thanks ;)
 
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