Sharp LC-32HT2U Service Manual page 36

LC-32HT2U
No audio output from external input
<<INPUT-1>>
Is L-ch audio signal fed from pin 12 of input terminal J501 to pin 53 of IC1403?
Is R-ch audio signal fed from pin 18 of input terminal J501 to pin 54 of IC1403?
<<INPUT-2>>
Is L-ch audio signal fed from pin 10 of input terminal J501 to pin 57 of IC1403?
Is R-ch audio signal fed from pin 16 of input terminal J501 to pin 58 of IC1403?
<<HDMI>> [INPUT-3/INPUT4 (Digital audio mode)]
Is digital audio signal (HDMI_SPDIF) fed from pin 70 of IC1508 to pin 2 of IC1401?
<<HDMI>> [INPUT-4 (Analog audio mode)]
Is L-ch audio signal fed from pin 3 of input terminal J1501 to pin 59 of IC1403?
Is R-ch audio signal fed from pin 2 of input terminal J1501 to pin 60 of IC1403?
<<INPUT-5>>
Is L-ch audio signal fed from pin 2 of input terminal J1502 to pin 55 of IC1403?
Is R-ch audio signal fed from pin3 of input terminal J1502 to pin 56 of IC1403?
YES
No audio output during digital broadcasting reception
Are the I2S signals MCLK, SCLK, LRCK, and DATA sent
from pins N22, N19, N21 and M20 of IC8101 (PH1) nor-
mally?
Are input signals of pins 24 (MCLK), 11 (SCLK), 10
(LRCK), 32 (DATA) of IC1403 normal?
Are audio signals from pins 29 and 30 (SC2_OUTL/R) of IC1401
to pins 51 and 52 of IC1403 (CODEC) normal?
Are audio outputs (A-OUT_L/R) of pins 38 and 39 of IC1403 nor-
mal?
Is audio input from pins 38 and 39 of IC1403 to pins 11 and 15 of
IC2701(STEREO_AMP) normal?
Is audio output from IC2701 normal?
Is the speaker switching circuit (T2701) normal?
Check the connector (P2703) of IF_UNIT and around the speak-
ers.
YES
YES
YES
YES
YES
YES
YES
Check around IC8101 PH1.
NO
NO Check the circuits between pins N22, N19, N21 and M20 of
IC8101 PH1 and pins 24, 11, 10 and 32 of IC1403.
NO Check between pins 29 and 30 (SC2_OUTL/R) of IC1401 and
pins 51 and 52 of IC1403 (CODEC).
NO Are the LRCK, BICK, SDTO and SDTI signals sent from IC1403
to IC1406 (DSP) normally?
Check IC1403 and peripheral circuits.
NO Check the circuits between pins 38 and 39 of IC1403 and pins 11
and 15 of IC2701. (MUTE circuits: Q1306-8)
NO Check IC2701 and peripheral circuits.
6 – 3
YES