Sharp Aquos LC-32LE600E, Service Manual

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LC-32/40/46LE600E/RU/S (1st Edition)
5 – 12
No sound of external device (3-3)
No DIGITAL sound from OPT OUT (D520).
Is the DIGITAL audio signal output to pin (1) of the OPT OUT ter-
minal (D520)?
YES Check OPT OUT terminal (D520) and the connection to an exter-
nal device.
NO
Is the DIGITAL audio signal (OPT_ OUT) output from pin (4) of
IC503? YES Check whether it is normal between an OPT OUT terminal
(D520) and IC503.
NO
Isn't the AUDIO_MUTE signal inputted into pin (1) of IC503 by
“L”? YES The pin (1) of IC503 should usually be “H”. If it is “L” signal,
check Q505, pin (1) of Q1301 and pin (35) of IC1302.
NO
Is the DIGITAL audio signal (OPT_ OUT) output from pin (E26) of
IC3303 (VCT) normally? YES Check whether it is normal between IC503 and IC3303.
NO
Isn't there problem in the power supply input (D3.3V, D1.1V) of
IC3303 (VCT), I2C_0 signal (SDA0/SCL0), and defective solder-
ing, etc.? NO Repair the faulty point around IC3303.
YES
Where is the input source of the sound from?
(TUNER, EXT5, EXT6, EXT7)
Check whether there is any problem in each input (terminal).
TU1102: TUNER
Check pin (T25) (R25) of IC3303, and pin (16) (17) of TUNER.
EXT5: HDMI_1
Check the TMDS input signal of HDMI_1 (1) (9) pin, the TMDS I/
O signal of IC1508, and the TMDS input signal of IC3303.
EXT6: HDMI_2
Check the TMDS input signal of HDMI_2 (1) (9) pin, the TMDS I/
O signal of IC1508, and the TMDS input signal of IC3303.
EXT7: HDMI_3
Check the TMDS input signal of HDMI_3 (1) (9) pin, the TMDS I/
O signal of IC1508, and the TMDS input signal of IC3303.