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         2008-03-14 

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 

 89 

< During external connection > No picture on the monitor (1) 

↓

  

No picture appears on SCART1 - connected monitor during the tuner (U/V) reception.

 

↓

  

 

 

 

 

 

TERMINAL_UNIT:

    

    ↓ 

 

 

 

 

 

     

↓NO 

 

 

 

 

 

     

↓NO 

 

 

 
 
 

 

< During external connection > No picture on the monitor (2) 

AVOUT:   

 

     

↓

  

No picture from SCART1 appears on AVOUT-connected monitor. 
NOTE:  Normally, if the screen during display is sent to SCART1, no picture is sent to AVOUT.

 

↓

  

 

 

 

 

 

TERMINAL_UNIT:

    

    ↓ 

 

 

 

 

 

     

↓NO 

 

 

 

 

 

     

↓NO 

 

 

 

 
 
 
 
 

Is CVBS signal output into pin (19) of CN151 (SCART1)?

 

YES 

 

Check the setting of an external input device that connects of 
CN151.

 

Refer to “The picture doesn't appear in all modes.”

 

Is U401 pin (AT31) CVBS signal output into pin (19) of CN151 
(SCART1)?

 

YES 

 

Check the line between CN151 and U401.

Checklist: 
1)  Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? …Set it to “CVBS”, “Y/C”, “RGB”, “AUTO”. 
2)  Is ANT-CABLE disconnected or connected improperly? …Connect it correctly as per the operation manual. 
3)  The picture is sent to the monitor in a CVBS signal if the source during display is ATV/DTV, CVBS or Y/C of SCART1, AV3. 

When sent by component, etc., that signal is not sent to the monitor. 

4)  When the monitor picture is not sent and is not displayed on the monitor, refer to “No picture” for each terminal. 
5)  The video output from SCART1 is not the monitor output (output of the picture now watching). 

The picture of the last selected TV channel is always sent to SCART1. (Specification)

Is CVBS signal output into pin (2) of CN140?

 

YES 

 

Check the setting of an external input device that connects of 
CN140.

 

Refer to “The picture doesn't appear in all modes.”

 

Is CVBS signal output from pin (AP31) of IC U401 into pin (2) of 
CN140 ?

 

YES 

 

Check the line between CN140 and IC U401.

Checklist: 
1)  Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? …Set it to “CVBS”, “Y/C”, “AUTO”. 
2)  The picture is sent to the monitor in a CVBS signal if the source during display is TV, CVBS or Y/C of SCART1, AV3. 

When sent by component, etc., that signal is not sent to the monitor. 

3)  When the monitor picture is not sent and is not displayed on the monitor, refer to “No picture” for each terminal. 
4)  The video output from SCART1 is not the monitor output (output of the picture now watching). 

The picture of the last selected TV channel is always sent to SCART1. (Specification)

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 

90  

 

 

↓ 

 
 

LINE_FILTER_UNIT:               

↓ YES

 

 
 
 
 
 

 

POWER_UNIT                 

     

↓YES

  

 
 
 

↓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,C901,L901,C904,C902,C903,L902,RV903, etc. out 
of order? Moreover, whether the short-circuit with the 
circumference circuit is checked. 
POWER_UNIT: 
BD901, FB905, C910, 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.) 
 
 

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, C943, 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 D962, L931, etc.

 

Are +60V output as for the power on/off switch when it is on?

 

NO 

 

Does the inverter circuit operate normally? 
Check circuit around the second side (L907, Q991, D985, IC902, 
Q903 etc.)

 

         2008-03-14 

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 

 91 

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 

 
 

 

 

 

 

 
 
 
 

Is the audio signal output of pin U36 (AR3), V37 (AL3) of IC U401 
normal? 

NO 

 

Check IC U401 and its peripheral circuits.

Is audio signal input to pin (4)(L), pin (11)(R) of IC U601 (AMP)?

NO 

 

Check the line between IC U605 and IC U601.

Is MUTE circuit [ Shutdown, OFF_MUTE] normal?

 

Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of 
CN601 (AOUDIO-CONNECTOR) normal? 

NO 

 

Check the Mute circuit. (Q601, Q602 etc.) 

Check IC U601 and its peripheral circuits.

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

 

NO 

 

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 

92  

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

↓ 

Does not the sound go out though the picture has come out when TV is received?

 

MAIN UNIT:

  

 

    ↓ 

 

 

↓YES 
 
 
↓YES 

 

 
 
 

 

↓ 

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

 

TEREMINAL UNIT:

   

    ↓ 

 

 
↓YES 

 
 

↓YES 

 
 
 
 

 

↓ 

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

 

TEREMINAL UNIT:

   

    ↓ 

 

 
↓YES 

 
 

↓YES 

 
 
 
 

 
 
 
 
 

Is the IF signal output from pin (16) and pin (17) of TUNER 
(TU102)?

 

NO 

 

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

Refer to “No sound output in all modes”.

 

Is the audio signal properly sent to pin (6) (SCT1_AUL_IN) and pin 
(2) (SCT1_AUR_IN) of SCART1 (CN151)?

Check the setting of an external input device that connects of 
CN151

 

NO 

 

Is the audio signal properly sent to pin (AA32) and pin (AB33) of IC 
U401?

 

NO 

 

Check the line between CN151 and IC U401

Refer to “No sound output in all modes”.

 

Is the IF signal sent to pin (AH35) and pin (AH37) of IC U401?

NO 

 

Check IC U401 its peripheral circuits.

 

Is the audio signal properly sent to pin (6) (SCT2_AUL_IN) and pin 
(2) (SCT2 AUR IN) of SCART2 (CN152)?

Check the setting of an external input device that connects of 
CN152

NO 

 

Is the audio signal properly sent to pin (AC36) and pin (AB37) of IC 
U401?

 

NO 

 

Check the line between CN152 and IC U401

Refer to “No sound output in all modes”.