Read Sharp LC-46LE820E (serv.man4) Service Manual online
LC-40/46/52LE820E, LC-40/46LU820E
7 – 7
No picture on the display (1)
The picture doesn't appear in all modes.
Is the LVDS signal output from IC3302 (DIGITAL_AV_DECODER_&_MAIN_CPU_&_VIDEO PROCESSER) respectively?
LVDS0_D0N/P (D14/C14), LVDS0_D1N/P (D15/C15), LVDS0_D2N/P (D16/C16), LVDS0_CLKN/P_83MHz (D17/C17), LVDS0_D3N/P (D18/C18),
LVDS0_D4N/P (D19/C19), LVDS1_D0N/P (B14/A14), LVDS1_D1N/P (B15/A15), LVDS1_D2N/P (B16/A16), LVDS1_CLKN/P_83MHz (B17/A17),
LVDS1_D3N/P (B18/A18), LVDS1_D4N/P (B19/A19)
YES
NO
Check IC3302 and its peripheral control circuits.
(IC2002, IC3501, IC3502, X3302, etc.)
(IC2002, IC3501, IC3502, X3302, etc.)
Is the above-mentioned LVDS signal output to connector P2601?
NO
Check the line between IC3302 and P2601.
YES
Similarly, is LCD controler's control signal normal?
NO
Please check each control signal of DET_POW (DET_PNL12V),
PE. (PNL_EN)
PE. (PNL_EN)
YES
PANEL_UNIT:
Is the LVDS signal input to connector LW of the panel module?
Is the LVDS signal input to connector LW of the panel module?
NO
NO Wire harness (LW) is checked.
YES
Check the panel module.
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
Is the video signal (TUNER_CVBS) output from pin (16) of
TUNER (TU1101)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
Replace as required.
YES
Is the video signal (TUNER_CVBS) sent to pin (AD29/
TU_CVBS) of IC3302 (Digital AV decode & Main CPU)?
TU_CVBS) of IC3302 (Digital AV decode & Main CPU)?
NO
Check the line between TU1101 and IC3302. (Q1106, etc.)
YES
Refer to “The picture doesn't appear in all modes.”
No picture on the display (3)
Does not the picture come out when DTV is received?
Refer to “No sound (during the reception of TV (DIGITAL) broadcasting).”
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