A1466 820-00165-A no boot

[hgoncalves]

Hi,

I have an A1466 820-00165-A that has no power.
I have green light but no fan spin and no usb activity.

On PP5V_S5 i only have 1.1V, and U7501 pins 14 and 29, also have 1.1V on PP5V_S5.
U7501 EN has 3.4V

Can you help?

 

[2informaticos]

Post more pins voltage for U7501; 23, 22, 12, 13, 29, 21.

 

[hgoncalves]

U7501:

23 = 0.9 V
22 = 0.005 V
12 = 3.4V
13 = 0 V
29 = 1.141 V
21 = 3.4 V

 

[2informaticos]

You don't have PPBUS_G3H and complain the board doesn't turn on???
Find why is not present.
Start checking in diode mode.

 

[hgoncalves]

Hi,
But I have PPBUS_G3H 8.57V. Don't understand

 

[2informaticos]

"23 = 0.9 V"
Broken trace???

 

[hgoncalves]

OK, . you're right I've made a jumper from Q7560 to C7500, and now it works.
It seams a broken trace inside the board. Is there any better way to "wire" those, besides passing a cable all the board extension to the other side?

 

[2informaticos]

Search on the same side other power rails derivated from PPBUS_G3H.

 

[hgoncalves]

Tks!