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         2008-03-14 

LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK 

 37 

TROUBLESHOOTING TABLE（26“&32”）

 

↓ 

 
 

LINE_FILTER_UNIT:          

↓ YES

 

 
 
 
 
 

 

POWER_UNIT                 

↓YES

  

 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Are the power cord and harness in the unit properly connected? 

NO 

Connect the power cord and harness properly, and turn on the 
power.

Is F901/F902 normal? 

NO 

 

LINE_FILTER_UNIT: 
Isn't RV901,L901,C904,L902,C903,C902,RV903, etc. out of 
order? Moreover, whether the short-circuit with the 
circumference circuit is checked. 
POWER_UNIT: 
BD901, FB905, C905, etc. out of order?  
Moreover, whether the short-circuit with the circumference circuit 
is checked. 

Is BD901 (+320V) output? (Set the main power SW to OFF.) 
 
*  When power on/off switch is on  ‧‧‧ About +400V 

Does the PFC circuit operate normally? 
(L906, Q901, D902, D903, IC901 and etc. And, the circuit around 
the protection circuit etc. is checked.) 

NO 

 

Is a voltage of +5V applied to pin (12,13) of connector (CN902)? 
(Set the main power SW to OFF.)

 

Does the switching circuit operate normally? 
Check circuit around the primary side (T901, IC931, Q931, 
ZD931, ZD930, ZD980, ZD981, etc.), the secondary side (D935, 
L980, etc.), the AC_DET circuit (IC932, IC982, etc.), and the 
protection circuit.

NO 

 

Are +24V output as for the power on/off switch when it is on?

 

NO 

 

Does the inverter circuit operate normally? 
Check circuit around the primary side (T902,Q951,Q952,IC951, 
D951,D952, etc.), the secondary side (D955, L932, ZD967, 
IC952, IC953, etc.), the STANDBY circuit (Q988, etc.), and the 
protection circuit.

Similarly, is +12V output as for the power on/off switch when it is 
on?

 

NO 

 

Check +12V circuit of D956, L931, etc.

 

LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK 
 

38  

The sound is not emitted from the speaker though the picture has come out.  

↓ 

No sound output in all modes?

 

TEREMINAL UNIT:

   

↓ 

 

 

↓YES 

 

 

↓YES 

 
 

↓YES 

 
 

↓YES 

 
 

↓YES 

 
 
 

No sound (during the reception of TV(ANALOG) broadcasting) 

↓ 

Does not the sound go out though the picture has come out when UHF/VHF is received?

 

TEREMINAL UNIT:

   

↓ 

 
 

↓YES 

 
 

↓YES 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the audio signal output of pin (84) (AUOutL) and pin (85) 
(AUOutL) of IC U4201 normal? 

NO 

 

Check IC U4201 and its peripheral circuits.

Is audio signal input to pin (5)(LIN), pin (6)(RIN) of IC U6102 
(AMP)?

 

NO 

 

Check the line between IC U6101 and IC U6102.

Is MUTE/SHUTDOWN circuit [AMP_MUTE, AMP_STBY] normal?

Is the audio signal output of pin (3,4) (LOUT+) and pin (1,2) 
(ROUT+) of CN6101 (AUDIO-CONNECTOR) normal? 

NO 

 

Check the AMP_MUTE and AMP_STBY. (Q6106, etc.) 

NO 

 

Check IC U6102 and its peripheral circuits.

Check Speaker Box (right and left) and wire harness.

 

Is the SIF signal output from pin (13) of TUNER (TU1101)?

 

Is the SIF signal sent to pin 54(SIFP) and pin 55(SIFM) of IC 
U4201?

 

NO 

 

Check the tuner and its peripheral circuits. Replace as required.

NO 

 

Check IC U4201 its peripheral circuits.

 

Refer to “No sound output in all modes”.

 

Is the audio signal output of pin (9) (OUTL) and pin (11) (OUTR) of 
IC U6101 normal? 

NO 

 

Check IC U6101 and its peripheral circuits.

         2008-03-14 

LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK 

 39 

 

 

↓ 

Does not the sound of the audio signal input to SCART1 go out?

 

Does not the sound of the audio signal input to SCART2 go out?

 

TEREMINAL UNIT:

   

↓ 

 
 
 
 

 
↓YES 

 
 
 
 

 
↓YES                      
 
 

 

↓YES 

 
 

No sound from external input devices (2) 

↓ 

Does not the sound of the audio signal input to YPbPr (Component) go out?

 

MAIN UNIT:

  

 

 

↓ 

 

 

↓YES 
 
 
↓YES 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the audio signal properly sent to pin (6) (YPbPr2_AU_INL) and 
pin (2) (YPbPr2_AU_INR) of SCART1(CN1901)?

 

Is the audio signal properly sent to pin (6) (SCHF_AU_INL) and pin 
(2) (SCHF_AU_INR) of SCART2(CN1902)?

 

Check the setting of an external input device that connects of 
CN1901.

 

NO 

 

Check the setting of an external input device that connects of 
CN1902.

 

NO 

 

Is the audio signal properly sent to pin (1) (NO) and pin (1) (NO) of 
IC U1702/U1701?

 

Is the audio signal properly sent to pin (3) (NC) and pin (3) (NC) of 
IC U1702/U1701?

 

NO 

 

NO 

 

Check the line between CN1901 and IC U1701/U1702.

Check the line between CN1902 and IC U1701/U1702.

Refer to “No sound output in all modes”.

 

Is the audio signal properly sent to pin (8) (YPbPr1_AU_INL) and 
pin (10)( YPbPr1_AU_INR) of CN1201?

 

NO 

 

Check the connection to CN1201 and the external input device.

Refer to “No sound output in all modes”.

 

Is the audio signal properly sent to pin (70) (AUL0) and pin (71) 
(AUR0) of IC U4201?

 

NO 

 

Check the line between CN1201 and IC U4201.

Is the audio signal properly sent to pin (72) (AUL1) and pin (73) 
(AUR1) of IC U4201?

 

Check the line between IC U1701/U1702 and IC U4201.

NO 

 

LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK 
 

40  

 

↓ 

Does not the sound of the audio signal input to PC(VGA) go out?

 

MAIN UNIT:

  

 

 

↓ 

 

 

↓YES 
 
 
↓YES 

                                                                                  
 
 

No sound from external input devices (4) 

↓ 

Does not the sound of the audio signal input to “AV side” go out?

 

MAIN UNIT:

  

 

 

↓ 

 

 

↓YES 
 
 
↓YES 

 
 

No sound from external input devices (5) 

↓ 

Does not the sound of the audio signal input to HDMI 1/”HDMI side” go out?

 

↓ 

 

 

↓YES 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the audio signal properly sent to pin (2) (PC_AU_INL) and pin (3) 
(PC_AU_INR) of CN1703?

 

NO 

 

Check the connection to CN1703 and the external input device.

Refer to “No sound output in all modes”.

 

Is the audio signal properly sent to pin (75) (AUL2) and pin (76) 
(AUR2) of IC U4201?

 

NO 

 

Check the line between CN1703 and IC U4201.

Is the audio signal properly sent to pin (4) (SIDE_AU_INL) and pin 
(6) (SIDE_AU_INR) of CN1206?

 

NO 

 

Check the connection to CN1206 and the external input device.

Refer to “No sound output in all modes”.

 

Is the audio signal properly sent to pin (77) (AUL3) and pin (78) 
(AUR3) of IC U4201?

 

NO 

 

Check the line between CN1206 and IC U4201.

Refer to “No sound output in all modes”.

 

Is picture of the signal input from HDMI 1/HDMI side displayed?

NO 

 

Refer to “Does not the picture of the HDMI signal input to 
 HDMI 1/HDMI side go out?”.