Macbook Pro 820-00850 stuck at apple logo

[Sam7771]

I am working with a 820-00850. When power up without the battery connected, keep on loading with the apple logo (progress bar filing slowly and checked for about 10 min and turned off by me since fan is working very fast). Fans are working at their maximum speed from the beginning.
It takes 3.1A and voltage is 19.45V according to USB-C meter. Customer said that he spilled some water on it but no marks of water damages. Sometimes, one vertical line also coming at the right side of the screen.

Any directions to fix the problem?

 

[tcampbell34]

This model requires a good battery to be connected or it wont boot and the fans will spin high. Connect a good battery to it and see if it boots

 

[Sam7771]

Connected with the battery and it turns on but still fans work at the maximum speed.

 

[2informaticos]

There should be a temp sensor issue.
Liquid spill caused problem with some I2C bus.

Disconnect webcam and try again.

Trackpad/keyboard must be checked too.

 

[Sam7771]

Even after removing everything and power-up with fans and power connected. We have the same issue. Is it a good idea to reflow U5850, 5860 and 5870? Though no green colour corrosions, I can see corrosions are developing.

 

[2informaticos]

If you remove EVERYTHING, fans will go high, of course.
Some temp sensors are external, like in trackpad board.

 

[Sam7771]

Yes I removed everything. I reflowed all three chips and no luck. still fans works at maximum. Specially left hand one when look from the side of the battery.

 

[2informaticos]

"Yes I removed everything"
I just said that fans go to max in such case.
SMC cannot detect temp sensor in trackpad, for example...