Sharp LC-26D43U Service Manual page 29

TROUBLESHOOTING TABLE
<<HDMI>>[INPUT-4/INPUT5 (Digital audio mode)]
Is digital audio signal (DTV_SPDIF) fed from pin E12 of IC8101 to pin 4 of IC1404?
<<HDMI>>[INPUT-5(Analog audio mode)]
Is L-ch audio signal fed from pin 3 of input terminal J1501 to pin 57 of IC1404?
Is R-ch audio signal fed from pin 2 of input terminal J1501 to pin 58 of IC1404?
PCIPUT<<INPUT-6>>
Is L-ch audio signal fed from pin 2 of input terminal J1502 to pin 55 of IC1404?
Is R-ch audio signal fed from pin 3 of input terminal J1502 to pin 56 of IC1404?
<<INPUT-1>>
Is L-ch audio signal fed from input terminal J505 to pin 12 of IC1405?
Is R-ch audio signal fed from input terminal J505 to pin 1 of IC1405?
<<INPUT-2>>
Is L-ch audio signal fed from input terminal J505 to pin 15 of IC1405?
Is R-ch audio signal fed from input terminal J505 to pin 2 of IC1405?
Is L-ch audio signal fed from pin13 of IC1405 to pin 53 of IC1404?
Is R-ch audio signal fed from pin3 of IC1405 to pin 54 of IC1404?
Yes
No audio output during digital broadcasting reception
Are the 12S signals DAKCK,SCLK,LRCK,and DATAOUT
sect from pins B22,F13,E13 and F12 of IC8101 normally?
Yes
Are input signals of pins 24 (DAKCK),11(SCLK),10(LRCK),
32(DATA) of IC1404 normal?
Yes
Are audio signals from pins 29 and 30 (SC2_OUTL/R) of IC1404 to
pin 27 and 25 of IC1407 (DSP) normal?
Yes
Are audio outputs (A-OUT_L/R) of pins 38 and 39 of IC1404 normal?
Yes
Is audio input from pins 38 and 39 of IC1404 to pins 3 and 5 of
IC2701(STEREO_AMP) normal?
Yes
Is audiio output from IC2701 normal?
Yes
Check the connector (P2703) of AV_UNIT and around the speakers
No audio output from external input
<<INPUT-3>>
Is L-ch audio signal fed from input terminal J509 to pin 4 of IC1405?
Is R-ch audio signal fed from input terminal J509 to pin 5 of IC1405?
No
No
No
No
No
No
29
(Continued)
Check around IC8101 BCM3551.
Check the circuits between pins B22,F13,E13 and F12 of IC8101
and pins 24,11,10 and 32 of IC1404.
Check between pins 29 and 30 (SC2_OUTL/R) of IC1404 and pins
27 and 25 of IC1407 (DSP).
Are the LRCK,BICK,SDTO and SDTI signals sent from IC1404 to
IC1407 (DSP) normally?
Check IC1403 and peripheral circuits.
Check the Circuits between pins 38 and 39 of IC1404 and pins 3 and
5 of IC2701.(MUTE circuits:Q1307,Q1313,Q1314)
Check IC2701 and peripheral circuits.
LC-26D43U
Yes