MacBook Pro Retina Late 2013 shows light, fan spin but no chime

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

If ALL_SYS_PWRGD = 0 volts then some power rail is not ok and is pulling down this signal line.

When in this state, measure the voltage at each grey coil and post the list of which rail is not working.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

Can you please help me, what is this grey coil you talk about? What are these measuring points?

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Look around for parts that look like this:

https://electronics.stackexchange.co...er-motherboard