Read LG 42SL90QD-SA (CHASSIS:LJ91L) Service Manual online
13. HDMI Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio
trouble shooting
N
Y
Re-download EDID data
Maybe BCM3556 audio block has
problems. Replace it
N
Follow procedure HDMI video
trouble shooting
N
Replace IC601
Click on the first or last page to see other 42SL90QD-SA (CHASSIS:LJ91L) service manuals if exist.