LC-42LE320E - Sharp TV Service Manual (repair manual). Page 126

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

126  

< 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) 

SCART2:  

 

     

↓

  

No picture from SCART1 appears on SCART2-connected monitor. 
NOTE:  Normally, if the screen during display is sent to SCART2, no picture is sent to SCART2.

 

↓

  

 

 

 

 

 

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 (19) of CN152 (SCART2)?

 

YES 

 

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

 

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

 

Is CVBS signal output from pin (AP31) of IC U401 into pin (19) of 
CN152 (SCART2)?

 

YES 

 

Check the line between CN152 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 SCART1-2, 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)