A1466 820-00165-A no power

[hgoncalves]

Hi,

I have an A1466 820-00165-A without power. (It takes 16V from bench PSU, and the amperage is very strange (oscilating bettewn 1~2A w/o battery). No fan spin, and CPU gets very hot, and thats with I try to don't take too long with it connected to the PSU.

PP3V3_S5 = 0.002 diode reading.

It had corrosion on U7501, and so I've replaced it.

Now, on L7560 I have only 0.002 on diode reading, and comparing it with other board, it should be arround 0.400.

I've lifted L7560 and the low reading is on PP3V3_S5_REG_R side.

I've injected 1.5V there, but nothing gets hot.

ON R7560 pin1 (P3V3_S5_VFB2_R) I have 0.014 on diode reading, but I think I should have around 0.400. Already replaced R7560/63, but same readings.

Can you help?

 

[2informaticos]

How can a resistor pull down a power rail in diode mode???
Put some logic in your job and avoid wasting time.
Damaged resistors increase their values, usually get open; impossible to cause any short on (cold) readings.

Lifting L7560 didn't discard U7501; follow pin 17's trace!

If CPU gets hot when connect the power, I bet is the culprit.
When inject voltage, remove CPU heatsink first and check PCH's die temperature.