HP DV9000 motherboard 434659-001 DA0AT7MB8E7 no power on after reballing

After reballing of GPU, no power on pressing button.

I have another same motherboard with same fault, it power on sometimes pressing button many times, up to becomes impossible to power on.

Someone had same fault?

Probably KB3920 or Southbridge ICH8?

Measure the voltages on PL30, PL31

Check si ok 5V and 3V

Measure the voltages on PL28, PL22, PL23, PL21, PL26, PL25

Hi,
But motherboard does not power on, 0V on all PL

-- 11 April 2014 --

If I press power button before plugging jack power it does power on if I plug jack power and after press power button it does no start up

Measure the voltages on all the pins of PQ48

Maybe a problem here

Pin of PQ48 1-2-3-4=0V
5-6-7-8=3,3V

Seems missing maind and susd 12V

what do you think?

Measure the voltages on all the pins of PQ18, PQ26, PQ27

But without 3,3V of SUSON from pin 7 of KB3920 PQ48 can't switch.

KB3920QF I see on pin 23, pressing power button it go down to 0 from 3,3V but don't start, I don't know why plug jack power pressing power button motherboard start up.

PQ18 pin3 = 9V
PQ26 pin3= 5V
PQ27 pin1-2-5-6=3,3V

-- 12 April 2014 --

When I forced to start up the motherboard, touching with a finger near PQ18 PQ14 PQ11 etc.
Motherboard shut off.

Voltages on the other pins?

If motherboard does not start up, 0V.

Measure the voltages on PC172, PR83
voltage pin 28 PU4
U16 pin 23
pin 2 PU9

all voltages only with jack plugged in

pc172= 2,6V
pr83= 3V
PU4 pin28=1V
U16 pin23=3,3V
PU9 pin2=0V

Voltages on all pins PU5

Replace GPU.

gpu short circuit

reprogram bios

-- Wednesday, 16 Apr 2014, 10:15 --

GPU is not powered

GPU has been lifted after reballing, but fault is the same, mobo starts even without GPU soldered.
It starts only pressing and holding power button and after plugging jack power.

let you know PU5 voltages early.

PU5 Voltages power jack plugged

Pin 3=3,3V

All others pins 0V