MacBook Pro 2015 13'' 820-4924 no power

[Sr. Robot]

Hello, i have a 820-4924 board with corrosion on U6100 . I replaced the chip and the laptop worked great for a few days. Then it stopped working. Theres light on the charger but no fan spin, CPU gets hot.

PPBUS_G3H, PP5V_S5, PP3V3_S5, PP5V_S0, PP3V3_S0 and PP1V5_S0 are all present. CPU Vcore is 1.8v.

When i resoldered U6100 to rule out a bad solder point, i noticed that when the board is still hot theres fan spin. After it cools out the fan wont spin anymore. I tried heating U1600 only with the iron but the fan didnt spin.

 

[2informaticos]

Probably is the CPU which reacts to heat.
Possibly accumulated crap underneath.

Check first all SPI Bus Series Termination resistors and their traces.
You may need to clean/remove J6100.

 

[piernov]

On 4924 the fan won't spin unless the CPU is very hot.

 

[Sr. Robot]

Thank you very much guys. Turns out the board was fine, I didn't know about the fan not turning on unless it was hot, so I thought it was not posting.