MacBook Pro A1286 motherboard 820-2915 green led, charging battery but no power on

I have not schematic and board view.
Customer try to reflow chip video and PCH too.
I check with another motherboard and I found difference on pin with red line in the photo.
That pin is 1,3 ohm to ground and I removed a capacitor but nothing changed.
Is it possible to find schematic and board view?

This one isn't good?

I found a short on PPVRTC_GH3
U2800 becomes hot when adapter is plugged, after lifting U2800, short remains.

Probably PCH shorted?

Hello!

You probably taught PPVRTC_G3H

How many ohms to ground do you have on shorted line?

Now I'm out but ohm to ground is 1,2.
I check another motherboard I don't remember now but ohm is more higher than 1,2.

If the capacitor C2231 is good and you still have short on PPVRTC_G3H , the PCH U1800 must be replaced to continue the diagnostics.
As you might as well do a short circuit test in a PPVRTC_G3H, starting from a safe 1V up to 3.3V for this power line.

It is probably bad PCH.
Remove it, and then check resistance again.

Without PCH there is no any short, I have to replace PCH and check again

After replacing PCH short on PPVRTC_G3H is solved, but motherboard does not power on

Measure voltage to ground on line PPVRTC_G3H (pin 1 of U2800).

I'm flashing bios before, but I have some problems because sometimes it stop writing or checking

valieromarco napisał(a):I'm flashing bios before, but I have some problems because sometimes it stop writing or checking

If I understand you correctly you had problems with flashing bios chip with programmer?
So now on the bios chip is no longer the original dump?

I flashed with a original dump file, downloaded from a site "says 100% working"

On pin 1 = 3,37V

valieromarco napisał(a):I'm flashing bios before, but I have some problems because sometimes it stop writing or checking

valieromarco napisał(a):I flashed with a original dump file, downloaded from a site "says 100% working"

So what kind of problems during flashing do you had?
Was the verifying of chip content after programming successfully?

Sometimes stop writing and two times verifying failed.
But now writing and verifying succefully

If there is still a problem with powering on, please go back to the original dump (I suppose you DID the backup before flashing) and check the results. If you still have the same problem, you probably did a bad PCH soldering or your PCH has passed away.

Customer did flash bios before give mainboard to me.
So dump that I flashed is not the original.
I replaced PCH with another one, but problem is the same.
I have to find a original dump file, do you have one?

Did you check this one?
macbook-a1286-pcb-820-2915-a-820-2915-b-t32009.html?hilit=820%202915

I did try to flash bios with your file, nothing is changed.
Can you give me the right voltages on pin of J5713

Measure voltage between pads highlighted on the following picture (it is power button pads).