Sharp 4T-B70CJ1U Service Manual page 33

2-7. No audio heard (3)
No HDMI sound heard
<HDMI1/HDMI2 >
(*HDMI1 / HDMI
↓ Yes
Does the HDMI image appear on screen ?
↓ Yes
No audio output from <HDMI1 / HDMI 2 >
↓ Yes
Are waveforms output from each HDMI pin
normally
↓ Yes
Is there I2S signal input at pin
(1),(2),(3),(4) of IC1702?
↓ Yes
Is the L-ch audio signal output at pin(8),
(9) ,(12),(13) of IC1702 normal ?
Is the R-ch audio signal output at pin(18),
(19),(22),(23) of IC1702 normal ?
↓ Yes
Are the audio signal L-ch and R-ch output
at (3)/(4) and (1)/(2) of P504 normal?
↓ Yes
Check speakers and their peripheral
circuits.
2 is digital audio )
4T-B70CJ1 TROUBLE SHOOTING
Refer to " ( HDMI1 / HDMI2 )is no external
NO
input video screen (HDMI)"
Check it if EDID is written or not.
NO
NO
Check peripheral circuits
Check connection between IC3301
NO
and IC1702 and its peripheral circuit.
Check IC1702 and its peripheral circuits.
NO
Check circuit between IC1702 & P504.
NO
4 - 31