No Audio or Chime 820-3209-A

mcrozz

New member
Have changed the I/O board, but not sure it?s 100% ok, bought a used one on ebay. No hardware detected, have reset nvram/pram, changed flex cable. But it detects my EZCAST which is on the same network connected to my tv, nor detection of headphones. Otherwise the air works flawless even usb on I/O board.

Any suggestions where to start

I saw the bios has been tampered with, It also was the wrong flex cable between the I/O board and MLB.

Thanks
 
Last edited:

mcrozz

New member
When I bought the LIO from ebay it came with a new flex. Well, connector looks fine on both sides (under scoope). there is no signs of liquide anywhere. Not sure what to meassure.
 

2informaticos

Administrator
Staff member
Check if voltage from pins 7 & 9 of J4700 arrive to LIO board.
Be sure HDA_RST_L stays high.
Also check resistance to ground (diode mode) on all HDA_ lines...
 
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