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A1304 820-2375-A

H

hgoncalves

Active member
Hi,
I have an A1304 820-2375-A, that has no power. I think that the problem may be in the PPBUS_G3H, that seams to low, but i'm not sure.

I get the following voltages:

PP3V42_G3H - 3.4V
PP18V5_G3H - 19V
PPDCIN_G3H - 19.5V
PPBUS_R_G3H - 8.4V
PPBUS_G3H - 8.4V

Can you help?
 
H

hgoncalves

Active member
OK.
PP1V05_S5 - 1.09V
PP3V3_S5 - 0.1V

I think that it is the PP3V3_S5, am I right? If so, where from here?

On pin 21 of the U7600 i get 3.4V
 
2informaticos

2informaticos

Administrator
Staff member
Good enough to get 3V3_S5 at L7620.
If not, check all surrounding resistors.
You may need to change U7600 and/or Q7620.
 
H

hgoncalves

Active member
I don't have a drop pulse on PM_PWRBTN_L (3.4V steady).
Can it be the power button? How can i power it from the board?
 
H

hgoncalves

Active member
With the SMC_ONOFF_L trigger it power its on.
I wanted to make sure if the problem is the button, or the connector, but can't figure out witch pin on the connector enables the power on. Can you help?
 
H

hgoncalves

Active member
Hi,
Ii seams that it powers on (it has fan spin), but i don't get any image, even on external monitor, and don't have any USB activity (PEN doesn't blink).
CPU gets hot, and i get voltages on all big coils...
Any idea?
 
H

hgoncalves

Active member
Hi.
I didn't change anything yet. Just conected and disconected the cables, made some measures, and it starts working by it self...
Do you have an known good BIOS (I have one, but not sure if it is good?
 
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