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LC-32/40/46LE600E/RU/S

5 – 9

                                            
No sound from EXT8 (CVBS-A-IN) connecting an external input 
device.

                                            
<EXT8>
Is CVBS-L audio signal input to pin (5) of EXT8 (J505)?
Is CVBS-R audio signal input to pin (4) of EXT8 (J505)? 

YES

Is CVBS-L audio signal input to pin (52) of IC1302 (A-SW)?
Is CVBS-R audio signal input to pin (51) of IC1302 (A-SW)?    

YES

Is the audio signal (A_IN_L/R) properly output from pins (6) and 
(7) of IC1302 (A-SW)?

NO

Check S9V power supply (10) (15) pin, D3.3V power supply (3) 
(36) pin, and SDA0/SCL0 signal pin (28) (27) of IC1302 (A-SW) 
or the peripheral circuit.

YES

Is the audio signal (A_OUT_SP_L/R) properly output from pins 
(H26) and (H25) of IC3303 (VCT)?

NO

Check D3.3V power supply pin (F18) of IC3303 (VCT) and the 
soldering confirmation or the peripheral circuit. 

YES

It is the same as the above-mentioned A-BLOCK. 

                                             
No audio output from EXT1 (SCART1) terminal. 

                                             
Checklist: 
1) Is the MUTE button on the remote control set to ON? 

••• Set to OFF.

2) Check the connection to external devices. 

•••Is there any improper connection?

                                             
Is audio signal output to pins (3) and (1) of EXT1 (SCART1) 
(SC503)?

YES

Check EXT1 (SCART1) (SC503) and the connection to an exter-
nal device.

NO

Is the SC1-MUTE signal of base (5) (2) pin of Q502 “H”?

YES

The Q502 base should usually be “L”.
If it is “H” signal, Check whether base of Q1301 is “L” or periph-
eral circuit.

NO

Is the audio output signal (TUNER_OUT_L/R) output from pins 
(11) and (10) of IC1301 (DAC) normal? 

YES

Check whether there are problems in IC1301 and Q502 or 
peripheral circuits.

NO

Is the audio output signal (I2S_DATA_TU) output from pins (B25) 
of IC3303 (VCT) normal? 

YES

Check whether there is problem in IC3303. 

NO

The input source of the audio is decided from TUNER. Is the SIF 
signal input to pin (AB25) of IC3303 (VCT)?

YES

Check whether there are problems in the power supply and sol-
dering IC3303 or peripheral circuits. 

NO

TUNER: TU1102
Check Q1101 (AMP), and pin (4) of TUNER.

LC-32/40/46LE600E/RU/S

5 – 10

                                             
No audio output from EXT2 (SCART2) terminal.

                                             
Checklist:
1) Is the MUTE button on the remote control set to ON? 

•••• Set to OFF.

2) Check the connection to external devices. 

••• Is there any improper connection? 

                                             
Is audio signal output to pins (3) and (1) of EXT2 (SCART2) 
(SC502)?

YES

Check EXT2 (SCART2) (SC502) and the connection to an exter-
nal device.

NO

Is the SC2-MUTE signal of base (5) (2) pin of Q501 “H”?

NO

The Q501 base should usually be “L”.
If it is “H” signal, Check whether base of Q1301 is “L” or periph-
eral circuit.

 YES

Is the audio output signal (MONITOR_OUT_L/R) output from 
pins (19) and (20) of IC1302 (A-SW) normally? 

YES

Check whether there are problems in IC1302, Q503, Q504 and 
Q501 or peripheral circuits. 

NO

Isn't there problem in the power supply input (S9V, D3.3V) of 
IC1302 (A-SW), I2C_0 signal (SDA0/SCL0), and defective sol-
dering, etc.?

NO

Repair the faulty point around IC1302.

 YES

Where is the input source of the sound from?
(EXT1, EXT2, EXT3, EXT4, EXT8)

                                             
Check whether there is any problem in each input (terminal).

EXT1/2: SCART1/2
Check pin (44) (43)/(46) (45) of IC1302 and pin (6) (2) of EXT1/2 
terminal (SCART1/2).

EXT3: COMP
Check pin (48) (47) of IC1302, and pin (2) (4) of EXT3 terminal 
(J502).

EXT4: PC/HDMI
Check pin (50) (49) of IC1302, and pin (2) (3) of EXT4 terminal 
(J501).

EXT8: CVBS
Check pin (52) (51) of IC1302, and pin (5) (4) of EXT8 terminal 
(J505).

LC-32/40/46LE600E/RU/S

5 – 11

                                             
No sound from AUDIO OUT (J506). (MONITOR OUT) 

                                             
Is the audio output signal send to pins (2) and (4) of the AUDIO 
OUT terminal (J506)? 

YES

Check AUDIO OUT terminal (J506) and the connection to an 
external device.

NO

Is the AUDIO-MUTE “L” signal input to pins (5) and (2) of Q509 
base?

NO

The Q1301 base should usually be “H”. If it is “L” signal, Check 
pin (35) of IC1302, pin (1) of IC1303, and soldering.

 YES

 Is the audio output signal (MONITOR_OUT_L/R) output from 
pins (19) and (20) of IC1302 (A-SW) normally?

YES

Check the power supply input (S9V, D3.3V), soldering, and the 
peripheral circuit of IC1302 (A-SW). 

NO

Isn't there problem in the power supply input (S9V, D3.3V) of 
IC1302 (A-SW), I2C_0 signal (SDA0/SCL0), and defective sol-
dering, etc.?

NO

Repair the faulty point around IC1302.

 YES

Where is the input source of the sound from?
(TUNER, EXT1, EXT1, EXT3, EXT4, EXT8)

                                             
Check whether there is any problem in each input (terminal).

TU1102: TUNER
Check pin (AB25) of IC3303, and pin (4) of TUNER.

EXT1/2: SCART1/2
Check pin (44) (43)/(46) (45) of IC1302 and pin (6) (2) of EXT1/2 
terminal (SCART1/2).

EXT3: COMP_L/R
Check pin (48) (47) of IC1302, and pin (2) (4) of EXT3 terminal 
(J502).

EXT4: PC/HDMI_L/R
Check pin (50) (49) of IC1302, and pin (2) (4) of EXT4 terminal 
(J501)

EXT8: CVBS_L/R
Check pin (52) (51) of IC1302, and pin (5) (4) of EXT8 terminal 
(J505).

L C - 3 2 /4 0 /4 6 L E 6 0 0 E /R U /S

5 – 12

                                             
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.