820-00165 no fan spin

[Neil250]

No green light, no fan spin.

PPBUS_G3H: 8.19 V

U7100
1: 0V
2: 14.71
3: 3.98
9:0.03
12: 2.76
13: 0
14: 2.65-2.73
15: 0.05 V

17: 8.19
18: 8.15
17-18 RES: 3.4 O

19: 5.10
20: 5.08

27: 14.57
28: 14.57
27-28 RES: 20 O

R7180: PIN 1 14.58V

No getting PP3V42_G3H so no power to SMC?


U7090
6: 14.88V
No shorts

 

[2informaticos]

Don't you want to know voltage on pin 8 too?

Check R7095/96 and C7094.
Be sure no short, nor low value on L7095.

 

[Neil250]

U7090
8: 14.98V

R7095: 230kO PIN 2: 1.25V
R7096: 190 kO
C7094: 0.215 uF


L7095: PIN 2: 2.82V
No short: diode mode: 0.312V at L7095

 

[2informaticos]

First, remove C7095.
If still the same, change R7095.

 

[Neil250]

Remove C7095 and not replace it?

What do you think is going on?

this is a feedback line correct?

 

[2informaticos]

Feedback pin is to "close" to 3V42; maybe cap lekage, or corrosion near R7095.

 

[Neil250]

genius!

changed C7095, green light, no fan spin
next changed R7095....fan spin!!!

boots into OS

spent another 1/2 hr changing a fan connector with a missing latch but it now works!!!!

thank you!!!!!!!