No Picture On The Display - Sharp LC-32X20E Service Manual

The picture doesn't appear in all modes.
MAIN UNIT:
Is LVDS signal output from 1st_channel and 2nd_channel of IC3301(VIDEO PROCESSER) in each mode?
TA1_P/M (A14/B14), TB1_P/M (A15/B15), TC1_P/M (A16/B16), TD1_P/M (A18/B18), TE1_P/M (A19/B19), TCLK1_P/M (A17/B17), TA2_P/M
(A20/B20), TB2_P/M (C20/D19), TC2_P/M (D20/E19), TD2_P/M (F20/G19), TE2_P/M (G20/H19), TCLK2_P/M (E20/F19)
Is the above-mentioned LVDS signal output to connector P2601?
Is LCD controller's control signal normal?
PANEL_UNIT:
Similarly, is the LVDS signal input to connector CN1 of the panel
module?
Check the panel module.
Does not the picture come out when VHF/UHF is received?
TERMINAL UNIT:
Is IF signal output from pin (17) of TUNRE (TU7501)?
Is IF signal input to pin (1) and (2) of IC7504 (IF-DEMO)?
Is picture signal input from pin (17) of IC7504 to pin (9) of IC506
(VIDEO_SELECTOR)?
Is CVBS signal (MAIN_Y/V) output from pin (52) of IC506 to pin
(68) of connector SC501?
MAIN UNIT:
Is CVBS signal (MAIN_Y/V) input to pin (68) of connector
SC1101?
Is CVBS signal (MAIN_Y/V) input to pin (Y4) of IC3301
(VIDEO_PROCESSOR)?
Refer to "The picture doesn't appear in all modes."

No picture on the display (1)

YES
YES
YES
YES
No picture on the display (2)
YES
YES
YES
YES
YES
YES
LC-32X20E/S/RU, LC-37X20E/S/RU
NO
Check IC3301 and its peripheral control circuits.
(IC2002, IC8101, IC3501, IC3502, etc.)
NO Check the line between IC3301 and P2601.
NO control signals R/L_LINE, U/D_LINE, TEMP1/2/3_LINE,
DET_PNL12V, ROMSEL0_LINE, ROMSEL1_LINE, and it peels
off and whether normality is checked.
NO Wire harness (LW) is checked.
NO Check whether I2C is normally accessed between named
TU7501 and IC7507 (COFDM).
NO Check the FL7502 (VIF_SAW) and their peripheral circuits.
NO Check the line between IC7504 and IC506.
(Q7505, IC7508, etc.)
NO Check the line between IC506 and SC501.
NO Check the connector SC501/SC1101.
NO Check the line between SC1101 and IC3301.
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