LC-70LE741E (serv.man11). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 10

LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E

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Is the LVDS signal output from IC3303 (DIGITAL_AV_DECODER_&_MAIN_CPU) respectively?
[LVDS0_D0N/P (B15/A15), LVDS0_D1N/P (B16/A16), LVDS0_D2N/P (B17/A17), LVDS0_CLKN/P_74MHz (B18/A18), LVDS0_D3N/P (B19/A19), 
LVDS0_D4N/P (B20/A20), LVDS1_D0N/P (C15/D15), LVDS1_D1N/P (E15/E16), LVDS1_D2N/P (C17/D17), LVDS1_CLKN/P_74MHz (E17/E18), 
LVDS1_D3N/P (C19/D19), LVDS1_D4N/P (E19/E20)]

  

YES

NO

Check IC3303 and its peripheral control circuits.
(IC2001, IC3501, IC3502, X3301, etc.)

Do above-mentioned LVDS signals output from connector 
(P2601)?

NO

Check the line between IC3303 and P2601.

  

YES

Similarly, is LCD controller's control signal normal?

NO

Please check each control signal of DET_POW (DET_PNL12V), 
PE (PNL_EN).

YES

LCD Controller Unit: 
Do LVDS signals input to connector (LW) of LCD Controller Unit?

NO

 Wire harness (LW) is checked.

YES

Check the panel module.

In the case of LE740,LE743 series, refer to (A).
In the case of LE741 series, refer to (B).

(B)

(A)

Does video signal (IFTU_AIF+/CVBS) output from pin [9] 
of TUNER (TU1102)?

NO

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

YES

Does video signal (TUNER_CVBS) input to pin [AK24/
CPU_CVBS0P] of IC3303 (Digital AV decode & Main 
CPU)?

NO

Check the line between TU1102 and IC3303. (Q1106, etc...)

YES

Refer to “No picture on the display (1)”.

Does video signal (IFTU_AIF+/CVBS) output from pin [9] of 
TUNER (TU1104)?

NO

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

YES

Does video signal (TUNER_CVBS) input to pin [AK24/
CPU_CVBS0P] of IC3303 (Digital AV decode & Main CPU)?

NO

Check the line between TU1104 and IC3303. (Q1106, etc...)

YES

Refer to “No picture on the display (1)”.