820-3115 fast fan

[Kyle93]

Originally arrived liquid damaged. After repairing board everything worked perfect.

2 months later it’s returned for fast fan spin. So far tried known good trackpad and cable. Replaced U5511 Q5050 and Q5520. Continuity from Q5520 to U5511 is good. R5511 and R5522 both measure the same 9.8 ohms.

what needs to be checked next? See picture for details

 

[2informaticos]

Test disconnecting webcam.

 

[Kyle93]

No change with webcam disconnected

 

[2informaticos]

Check voltage and diode mode to ground on SCL/SDA lines of U5511.

 

[Kyle93]

SDA 3.4V .502

SCL 3.4V .502

 

[2informaticos]

The communication on SMLink 1 is affected; there is not one sensor issue.
If you change all possible, then remains SMC, PCH and CPUone of them block that I2C bus.

R5510 is good?