[SOLVED]820-3332 TW0P Sensor Error

[iambehr]

Hello,

This board has no liquid damage. It had intermittent kernel panics and shutdowns until I addressed bad solder joints at U8900.
It is failing diagnostics with sensor error TW0P, which I think is airport proximity temp. Fans do not spin on high, however.
I checked for 3.3V at U5523 and U5570. Replaced U5570 to test, no changes to behavior. Checked data lines SMBUS_SMC_1_S0_SDA and SCL, no oscilloscope available but fluctuations on those lines indicate that there is some kind of modulation (data?) on those lines.
Any thoughts? Replacing U5523 will be a pain due to connectors in that area, would it be better to bottom heat?
Or is it the SMC?

Thanks,

Stefan

 

[iambehr]

If there is not enough information, or if I am being an idiot, please feel free to let me know as well. I'll take any chance to learn!

 

[aprendiz]

If no other sensor is failing I say bad U5523

 

[iambehr]

Please mark post as resolved. Replaced U5523 and the issue was resolved. I looked at it under high magnification and the top looked a little funny.. almost like a chip was taken out of the top of it.
Pain in the neck to replace that particular component surrounded by the fan, IO board, and wifi connectors.