Macbook Pro 15" 2011 late motherboard repair

[mateksz]

Hi guys,

I have a water damaged Macbook Pro 2011 15". I am a complete beginner. I’ve watched a couple of youtube videos, but I don’t know more, so I’m sorry if I’m writing nonsense.
The problem: No power. Sometimes I have green charging led, sometimes not.

I downloaded the board schematics and the .brd file and openboardviewer.
I checked the 3.3v rails, It looks good. I have 5v on PP5V_S5, but no on P3V3S5. So I think the U7201 (TPS51980) chip is bad. I've checked the P3V3S5_EN enable signal, and it is good (3.x V).
What do you think? U7201 (TPS51980) is faulty? Or it can be something else? What should I check?

Thank you!

[ivi_yak]

hi, take a look around about corrosion its 90% of all cases

[ivi_yak]

check pgood state

[kripton2035]

on these models you may also have a bad nvidia chip ... it doesn't prevent power on but you have to plan on buying a chip to disable the nvidia chip after this repair.

[mateksz]

P5VS3_PGOOD is 0V, not shorted. What it means?

[mateksz]

These models have amd gpu, but I thnik the water damage couses the problem not the GPU

[ivi_yak]

I guess some cap is shorted to ground  so power up your board and palp all the caps around chip and you find the hottest one desolder it and power board again 

[mateksz]

So, some progress. I do not have PM_SLP_S4_L, which is necessary for the u7201 and come from U1800 chip. I checked U1800 ENs and I do not have SMC_ADAPTER_EN, that come from U4900 chip. But now I do not know what to do.
Do you have any idea?   

[kripton2035]

I would bath the board in an ultrasonic cleaner, you may have some corrosion left.

[MegaObi]

hey bud - how did you go with this?