LC-46DH77E (serv.man5). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 6

LC-42DH77E/RU/S/V, LC-46DH77E/RU/S/V

4 – 6

                                             

                                            
Is the LVDS signal output from IC8101 (DIGITAL_AV_DECODER_&_MAIN_CPU_&_VIDEO PROCESSER) respectively?
TA1_P/M (AC25/AC26), TB1_P/M (AD25/AD26), TC1_P/M (AE25/AE26), TD1_P/M (AE24/AF24), TE1_P/M (AE23/AF23), TCLK1_P/M (AF25/
AF26), TA2_P/M (AE22/AF22), TB2_P/M (AE21/AF21), TC2_P/M (AE20/AF20), TD2_P/M (AE18/AF18), TE2_P/M (AE17/AF17), TCLK2_P/M 
(AE19/AF19)

YES

NO

Check IC8101 and its peripheral control circuits.
(IC2003, IC9101, IC8301, IC8302, X8102, etc.)

Is the above-mentioned LVDS signal output to connector 
SC2601?

NO

Check the line between IC8101 and SC2601.

                                             

YES

Similarly, is LCD controller's control signal normal? 

NO

Please check each control signal of L/R, U/D, HV_MODE, 
ROMSEL_0/1, TEMP3/2/1, OS_EN, SHIP_EN, and PE.

PANEL_UNIT:                       

YES

Is the LVDS signal input to connector LW of the panel module?

NO

Wire harness (LW) is checked. 

 YES

Check the panel module.

                                            

                                            
Is the video signal (TUNER_CVBS) output from pin (6) of 
TUNER (TU7501)?

NO

Check whether I2C signal normally communicates between 
TU7501 and IC7508 (COFDM - DEMOD.)

YES

Is the video signal (TUNER_CVBS) sent to pins (24) of IC503 
(AV_SW.)?

NO

Check the line between TU7501 and IC503.
(IC7503, etc.)”

YES

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