Macbook pro 2014 blue screen

[john]

Hi.
I`ve got this macbook pro 2014 (820-3787-A)
When I plug the charger I have a green light the fan is spinning. When I turn it on I have this blue screen. The only places where it have corrosion from water damage is the keyboard pad and the corner of the macbook where are batteries.
Any suggestion where to start?

 

[dukefawks]

Never seen this, pictures please.

 

[john]

No Title

sorry my bad it`s not blue. it look like the backlight is on but no imagine
also theres no chime

 

[dukefawks]

Remove SSD and do a PRAM reset. Wait for 30 seconds and see if the question mark starts blinking.

 

[john]

No Title

Fixed the problem the keyboard connector was corroded and some key was pressed during that. change the connector and test the macbook. Everything seams to be ok apart for the fans they are spinning at full speed. test with ASD and it give me the error in picture. any suggestions?

 

[aprendiz]

Water damage around U5850, otherwise a bad trace, bad ball or bad GPU, this diode is inside GPU.....

 

[john]

the u5850 looks good no water in that area...should i reflow the gpu?

 

[john]

does anyone know how to fix this problem?

 

[dukefawks]

Do not reflow, just some flux and heat 150C, should be enough to clear crap under GPU.

 

[john]

No Title

I heated the GPU the error disappeared. After I heated I cleaned in ultrasonic.
Now I have 2 errors one is:
ID0R duc in test 1 sensor reads within operating range
IPBR Battery BM0N test 1 sensor reads within operating range

 

[dukefawks]

Both come from ISL6259, check sense resistor circuits. R7150 and R7120 both sides to 6259.