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LC-19D1E/S-BK/WH

4 – 3

                                            
The power supply of a AUDIO system does not operate.

                                            
Checklist:
1) The check of the front page POW (1) is completed. 

• • • UR12V is output to SC1204 (MAIN-PCB).

(If UR12V is not output, confirm the POW(1) again and repair.)

2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.

(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)

3) Refer to attached sheet Power-Block diagram.

                                            
Is UR12V supplied to pin(47)(46)(39)(38) of IC303(P-AMP) ?

NO

Check the UR12V line from pin (13-15) of SC1204. 

YES

Is B3.3V supplied to pin(13)(26) of IC302(A-CODEC) ? 

NO

Check the soldering of IC302 or  Is B3.3V output from pin(3) of 
IC703(REG)?

YES

NO

Is UR12V supplied to pin(7) of IC703(REG) ? 
Check the soldering of IC703(REG) or exchange it. 

Is B9V supplied to pin(14) of IC301(A-SEL) ? 

NO

 Is B3.3V output from pin(5) of IC702(REG)?

YES

NO

Check the soldering of IC301(A-SEL) or exchange it. 

Check the soldering of IC702(REG) or exchange it

LC-19D1E/S-BK/WH

4 – 4

                                            
The power supply of a PANEL system does not operate.

                                            
Checklist:
1) The check of the front page POW (1) is completed. 

• • • UR12V is output to SC1204 (MAIN-PCB).

(If UR12V is not output, confirm the POW(1) again and repair.)

2) Check that BU3.3V is supplied to IC2002 (SUB-MICON), and the AC-CTL signal H is output from 35pin within a MAIN board.

(If BU3.3V is not supplied, check IC2004 (BU3.3V-REG) and a periferal circuit.)

3) Refer to attached sheet Power-Block diagram.

                                            
Is B12V output from pin(6) of Q702(SW)? 

NO

Check the soldering of Q702(SW) or exchange it. 

YES

Is VGL(-7V)/VGH (28V) output from pin(1)/(3) of IC704(SW-
REG)?

NO

Check the soldering of Q704(SW-REG) or exchange it. 

YES

Is VLSB14.6V output from pin(3) of IC701 (VLSB14.6V-REG)? 

NO

Check the soldering of IC701(VLSB12V-REG) or exchange it.

YES

Is VH24/VH56/VL 56/VL24 output from pin(7)/(1)/(8)/ (14) of 
IC1001(OP-AMP)?

NO

Check the soldering of IC1001(OP-AMP) or exchange it.

YES

Is COM-BIAS output (4.2V) from pin(7) of IC9202(COM-BIAS)?

NO

Check the soldering of IC9202(COM-BIAS) or exchange it. 

YES

Is each voltage supplied to SC9201(CONN) ?
(VLSB14.6V,VGH,VGL,COM-BIAS)

NO

Check the soldering of SC9201(CONN) or exchange it.

YES

Check the FPC of PANEL or exchange PANEL-MODULE.

LC-19D1E/S-BK/WH

4 – 5

No audio output during 
DTV reception 

Checklist :
1)  Is the volume set to MIN or MUTE on the remote control ? 

• • • Set the desired volume.

2)  Is ANT-CABLE disconnected or connected improperly ? 

• • • Connect it correctly as per the operation manual.

(AV-UNIT)

   

(DIGITAL-UNIT)

Is the audio signal (L/R) 
input to pins (17) and (18) 
of  IC501 (AV-SW)?

NO

Is the DTV-A-_L/R signal 
output from pins (7) and 
(1) of IC4605 (OP-AMP)?

YES

Check either pins (8) and 
(9) of Connector  SC4602 
or pins (8) and (9) of  
Connector P503, or 
check peripheral circuits.

YES

NO

Is the audio signal 
(TERMINAL_L/R) output 
from pins (34) and (33) of  
IC501 (AV-SW)?

NO

Check the power sup-
ply B9V pins (38) and  
peripheral circuits.

Is the audio signal (LEFT/
RIGHT_P/M) output from 
pins (25)(24) and (29)(28) 
of  IC4001 (DIGITAL-
PROCESSOR) ?

YES

Are LEFT_P/M and the 
RIGHT_P/M signal input 
to pins (5)(6) (3)(2) of 
IC4605 (AMP)? or check 
peripheral circuits.

(MAIN-UNIT)

YES

NO

Is the audio signal 
(LOUT2/ROUT2) output 
form pins (25)  and (23) of  
IC302 (A-CODEC) prop-
erly? 

NO

Check pins (1) and (4) 
of  IC302 (A-CODEC), 
pins (11) and (12) of  
Connector SC1202, 
audio-mute line (Q301/
Q302) or peripheral  
circuits.

Is the serial digital signal 
(TSOUT7) input to pin 
(36) of  IC4001(DIGITAL-
PROCESSOR)?

YES

Check the power supply 
3.3V pins (3-129) 2.5V 
pins (151-212) and 1.2V 
pins (8-204)  of IC4001 
(DIGITAL PROCES-
SOR). Or check periph-
eral circuits.

YES

NO

Is the audio signal L-CH 
output to  pins    (44-45) 
and (40-41) of  IC303 
(POWER-AMP) and also 
the audio signal R-CH 
output to  pins  (20-21) 
and (16-17) of  IC303 
(POWER-AMP) properly? 

NO

Check  UR12V power 
supply input pins (47) 
and (14)  of  IC303 
(POWER-AMP) or 
peripheral circuits. 

Is serial digital signal 
(FED7) input to  pin(12) of 
IC4005(BUFFER)?

YES

Check IC4405(BUFFER) 
or peripheral circuit.

YES

(AV-UNIT)

NO

Is the audio signal of  pins 
(1),(2),(3) and (4) of P301 
(SP-Connector) output 
normally ?

NO

Check SP- Connetor 
(P301) and peripheral 
circuits

Is the serial digital signal 
(FED[7]) output from pin 
(43) of  IC202 (DVB-T)?

YES

Check the connection 
between pin (10) of  
SC4601 and pin (10) of  
P202, or check periph-
eral circuit

YES

NO

Check SP-BOX (right and 
left) and WIRE HAR-
NESS.

Is the IF(D1/D2) signal 
output from pin (17)/(16) 
of Tuner (TU201)?

YES

Check IC202(DVB-T) or 
peripheral circuit. 

NO

Check the B5V/B5V 
(CONT)/IF5V power sup-
ply  pins (11)/(1)/(3) , SDA/
SCL signal pins (9)/(8) of 
Tuner (TU201). 

YES

Replace Tuner (TU201).

LC-19D1E/S-BK/WH

4 – 6

                                    

No audio output during UHF/VHF reception

                                    

Checklist:
1) Is the volume set to MIN or MUTE on the remote control? 

• • • Set the desired volume.

2) Is ANT-CABLE disconnected or connected improperly? 

• • • Connect it correctly as per the operation manual.

(AV-UNIT)                                     

YES

Is the audio signal (L/R) output from pins (34) and (33) of IC501 
(AV-SW)?

NO

(MAIN-UNIT)                 

YES

Is the audio signal (LOUT2/ROUT2) output form pins 
(25)  and (23) of  IC302 (A-CODEC) properly?  

NO

Check pins (1) and (4) of  IC302 (A-CODEC), pins (11) and (12) 
of Connector SC1202,audio-mute line (Q301/Q302) or peripheral  
circuits.

YES

Is the audio signal L-CH output to  pins    (44-45) and 
(40-41) of  IC303 (POWER-AMP) and also the audio 
signal R-CH output to  pins  (21-22) and (16-17) of  
IC303 (POWER-AMP) properly?  

NO

Check  UR12V power supply input pins (47) and (14)  of  IC303 
(POWER-AMP) or peripheral circuits.

YES

Is the audio signal of pins (1), (2), (3) and (4) of P301 
(SP-Connector) output normally? 

NO

Check SP- Connector (P301) and peripheral circuits. 

YES

Check SP-BOX (right and left) and WIRE HARNESS. 

(MAIN-UNIT)
Is the MPX/PC/HDMI_A_L/R signal output to pins (11) and (15) 
of IC301 (A-Selector)? 

YES

Check either pins (9) and(10) of Connector SC1202 or pins (9) 
and(10) of Connector P501. Or check peripheral circuits.

                                    

NO

Is the audio signal (DVPM2_L/R) output from pins (B23) and 
(D23) of IC801 (DVP-M2)?

YES

Check pins of  (6) and (1) of IC301 (A-Selector), pin(14) of power 
supply 9V  and peripheral circuits.

                                    

NO

Is the audio signal (SIF) input to pin (A21) of IC801 (DVP-M2)?

YES

Check the power supply B1.5V pins (C18) and B3.3V pins (A18)/
(A22) are supplied to IC801 (DVP-M2).
Or check peripheral circuits.

(AV-UNIT)                                    

NO

Is the SIF signal output from pin (12)  of  Q210(BUFFER)?

YES

Confirm pin (7) of Connector  SC1202 or pin (7) of  Connector 
P501. Or please check the peripheral circuit.

Is the SIF signal output from pin (4)  of  Tuner (TU201)?

YES

Check Q203,Q210 and peripheral circuit. 

                                    

NO

Check the B5V/B5V(CONT)/IF5V power supply input pin (11)/(1)/
(3) of TUNER (TU201), SDA/SCA signal pins (9)/(8) and AGC 
signal pin (15).

YES

Replace Tuner (TU201).