Sharp Aquous 4T-B70CJ1U, Service Manual, Page: 33 / 63

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