Macbook Air 820-00165

[Francisco.s]

Hi, this Mac-book works all circuits, but has no speakers sound. (works OK with headphones)

SPKRAMP_SHDN_L is always low, but goes high at boot time. (when chime is heard)

There are no signs of corrosion or liquid damaged.

Probably the LIO board is damaged but there is no schematic or boardview to see the circuit.

Can someone helps me to solve the problem?

[Francisco.s]

Re: Macbook Air 820-00165

I have not found any information about LIO board, but I have solved the audio problem reflowing the cirrus cs4208crz audio chip.

Now, the mute signal (SPKRAMP_SHDN_L) goes high during "chime" then goes low and keeps low until osx fully loads, then keeps high.

Most probably, there were some debris under the audio chip.