RCA 26LA33RQ Service Manual page 20

5.2 Audio Exceptions
5.2.3 No sound (HDMI)
1
Is the signal No _]]_1
source HDMI OK?
1
Unsupported signal, change
input signal of HDMI device
Yes
Check if the PC/AV
sound is normal
No
Refer to NO SOUND
Yes
<_ Is the EDID(1) Yes>_l _
Upgraded firmware
Change U7 or U8
or main board
Note (I): EDtD means Extended Display Identification Data
Version 1.0
18