Macbook A1466 not power on after liquid damage (Mainboard 820-3437-B)

Good afternoon friends of the forum, this laptop has entered the laboratory with the problem that it does not turn on completely. Connecting the power supply, the green led turns on and then turns orange but if I give the power on, nothing happens. By connecting the motherboard to the power supply without battery, the green LED lights up and then turns orange (without battery) and no fan spin
I found several oxidized spots on the board and cleaned them up. I made some measurements:
PPBUS_G3H 8,5v
PPDCIN_G3H 14,495v
PP3V42_G3H 3,42v
PP5V_S5 5V
PP5V_S4RS3 0v
PP5V_S0 0v
PP3V3_S5 3,33v
PP3V3_S4 0v
PP3V3_S3 0v
P3V3_S0 0V

MAINBOARD MODEL: 820-3437-B

any suggestions?

Hello!

Please, post a clear picture of spilled area of the board in its current state.

Thank's Matic

Are this pictures of the board after the cleaning?

Yes, i don't have big ultrasonic washer for cleaning Mother board perfectly

This board is definitely not cleaned enough.

First of all, read the training department of the forum and teach how to properly clean the spilled board (this part of the post is unfortunately not translated into English, but you can use a translator).
Then thoroughly clean the board and post the pictures again.

robgerr ha scritto:i don't have big ultrasonic washer for cleaning Mother board

You don't need it at all.

Thanks Matic, I cleaned the board better especially in the last photo, the macbook turns on and works perfectly but there is a strange defect, if I keep it off for more than half an hour it does not turn on, I remove the board from the chassie, the I put it back after a while and the macbook restarts, I tried to do a reflow on the smc by melting the balls because touching it slowly with the tweezers and sms it moved, I let it cool down, the macbook restarts but after keeping it off for half an hour returns returns the defect.

robgerr ha scritto:if I keep it off for more than half an hour it does not turn on

Is a green light on MagSafe present, when the machine does not turn on?

If so, measure the voltage to ground on capacitor C4834 when the machine does not turn on in the following cases:
a) Power button released.
b) Power button pressed.

Is a green light on MagSafe present, when the machine does not turn on?

Yes.
i think i solved it, i found more oxide in the jtag connector and on another component. Removed the jtag connector and resoldered the component, it seems that it is working. I reassembled it and am testing it
***UPDATE***
Thank's Matic, macbook work perfectly after remove oxided Jtag connector