Answer to "Please help me locate the temperature sensor on this MacBook"Hi just to confirm , Had the same issue. History liquid got just right on the lcd internal board. I read the values (voltage) on all I2C datalines from the lcd and compared with a working board/working lcd and found out ALS data lines (SCL and sda) were pulled down like 1,6V instead of 3.3V. Resistance to ground on the ALS scl and sda probe points was low with the faulty lcd compared to another working one. These ALS (Ambient Light Sensor) datalines are sharing the same bus (SMC_S1_S0_SDA/SCL) than other sensors like : Temp sensor near the charger, thunderbolt and wifi, fin stack cpu proximity. So ALS messed all the bus and this is why fans go crazy. Instead of removing R8556 R8558 I just cut the traces to the lcd connector.