A1466 820-00165-A no power

[hgoncalves]

Hi.

I have an A1466 820-00165-A with no power. I have green light on charger but no fan spin, and only puls 0.2A from lab PSU.

R8165 was burnt and ALL_SYS_PWRGD pad was gone, and I've jumped it to pin 4 of Q8150.

PPBUS_G3H = 8.59V
PP3V42_G3H = 3.4V

SMC_RESET_L = 3.3V

PP5V_S5 = 5V
PP5V_S0 = 0V

PP3V3_S5 = 0V

ALL_SYS_PWRGD = 0V

CAn you help?

 

[2informaticos]

Do you get 3V3_S5/SUS?

 

[hgoncalves]

3V3_S5/SUS are both with 0V

* I've made a mistake with the board model. The correct board model is 820-3437

 

[2informaticos]

Post U7501 voltages: pins 23, 22, 12, 13, 29, 21.

 

[hgoncalves]

Hi.

U7501:
23 = 8.59V
22 = 3.3V
12 = 3.4V
13= 1.996V
29 = 5V
21 = 3.4V

 

[2informaticos]

So 3V3_S5 is enabled.
Check diode mode to ground at L7560.

 

[hgoncalves]

L7560 diode reading = 0.002

Pad 2 (PP3V3_S5_REG_R) = 0 0.001
Pad 1 (P3V3_S5_REG_L) = 0.441

Can I inject 1V on PP3V3_S5_REG_R?

 

[2informaticos]

Is the logic step...

 

[hgoncalves]

Nothing gets hot, even increasing until 3V and consuming 1.8A.

I've removed L7560, C7593, C7592, C7590 and C7572 but PP3V3_S5_REG_R remains shorted (0.002 diode reading), and nothing gets hot even so.

 

[2informaticos]

"nothing gets hot even so"
Did you forget to set amp limit to max?

 

[hgoncalves]

Hi.

No, it's set to 5A. It reaches around 1.8A, with 3V, but I can't see nothing hot. Can it be an internal board layer (not sure if this makes any sense)?

 

[2informaticos]

You can go up to 4V.
Be sure to use powerfull cables.
You want to heat something on the MLB, not the cables.

Remove heatsink and use IR camera.