LC-32SD1E (serv.man8). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 10

LC-26SD1E/RU, LC-32SD1E/RU

6 – 10

                                            
No picture appears on LCD during the tuner (U/V) reception.

                                            

 

Checklist: 
1) Is “INPUT SOURCE” button 

on the remote control set up correctly? 

••• See the operation manual and set “INPUT SOURCE” to “TV”.

2) Is MENU-PICTURE-Contrast/Brightness set to “MIN”? 

••• Set it to an appropriate level.

3) Is ANT-CABLE disconnected or connected improperly? 

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

YES

Is level of pins (4) and (5) of tuner (TU201) and pins (10) and (11) 
of IC201 (IF-DEMOD) at H?

NO

These are communications lines for control (I2C). Follow the 
path and check whether they are forced to L (PULL_DOWN). 

YES

Is the video signal (IF) sent from pin (8) of tuner (TU201)?

NO

Check the tuner (TU201) and peripheral circuits.

YES

Is video signal sent from pin (17) of IC201 (IF-DEMOD)? 

NO

Check FL201 (SAW-FIL), IC201 and peripheral circuits.

YES

Is the video signal VIN1 (ATUNER-CVBS) sent to pin (191) of 
lC3002 (VCT)? 

NO

Check IC201 (IF-DEMOD), CONNECTOR (P201 /SC2705) and 
peripheral circuits.

YES

Is LVDS video signal (LVDS_0N/0P-3N/3P) sent to pins (141)/
(140) - (129)/(128) of IC3002 (VCTP), and is CLK signal 
(LVDS_CN/CP) sent to pins (132)/(131)? 

NO

Check pins (192)/(170)/(133) of BU3.3V line of IC3002 (VCTP), 
pins (185)/(169)/(142) of 1.8V line and peripheral circuits.

YES

Is LVDS video signal (LVDS_0N/0P-3N/3P) sent to pins (12)/(13) 
-(24)/(25) of CONNECTOR CN1 of LCD-CONT-UNIT, and is CLK 
signal (LVDS_CN/CP) sent to pins (21)/(22)? 

NO

Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).

YES

Is power (LCD5V) supplied to pins (2) - (5) of CONNECTOR CN1 
in LCD-CONT-UNIT? 

NO

Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).

YES

Replace LCD-CONT-UNIT.