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LC-19D1E/S-BK/WH

4 – 2

                                            
The power supply of a VIDEO system/IC801 (DVP) 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 B1.5V supplied to pin(D12) of IC801 (DVP) ?

NO

Check whether B1.5V is output from pin(6) of IC705.

YES

NO

Check whether POWER-CTL signal is input to pin(4) of IC705 
(REG).

YES

Is B12V supplied to pin(5) of IC705 (REG) ?

YES

Exchange IC705 (REG).

Is B3.3V supplied to pin(R19)(D5) of IC801(DVP) ?

NO

Check whether B3.3V is output from pin(3) of IC703 (REG). 

YES

NO

Check whether UR 12V-CTL signal is input to pin(7) of 
IC703(REG).

YES

Is B12V supplied to pin(2) of IC703 (REG) ?

YES

Exchange IC703 (REG).

Is B3.3V supplied to pin(1)(19) of IC9201 (RSDS-TR) ?

NO

Check whether B3.3V is output from pin(3) of IC703 (REG). 

YES

NO

Check the soldering of IC801 and IC703 or exchange it. 

Check whether UR 12V-CTL signal is input to pin(7) of 
IC703(REG).

YES

Is B12V supplied to pin(2) of IC703 (REG) ?

YES

Exchange IC703 (REG).

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).