Sharp LC-46LE831E (serv.man16) Service Manual ▷ View online
LC-40/46LE830E, RU/831E, S
6 – 9
No sound from external output device (3)
No sound from DIGITAL AUDIO OUTPUT terminal.
Does audio signal output from pin [1] of sound output terminal
(D527)?
YES
Check D527 and peripheral circuits.
NO
Does audio signal output from pin [4] of IC503?
YES
Check the line between IC503 and D527.
NO
Is AUDIO_MUTE (MUTE_A_ALL) [23 pin] of IC2001 (UCOM) at
“H”?
“H”?
YES
Check the peripheral circuits of IC503 and AUDIO_MUTE.
(Q505 etc...)
(Q505 etc...)
NO
Does audio signal input to pin [2] of IC503?
YES
Check IC503 and peripheral circuits.
NO
Does audio signal (OPT_OUT) output from pin [AA31/
CPU_ASPDIF] of IC3303 (Digital AV decode & Main CPU)?
CPU_ASPDIF] of IC3303 (Digital AV decode & Main CPU)?
YES
Check the line between IC3303 and IC503.
NO
Check IC3303 and its peripheral circuits.
No sound from external output device (4)
Does not the sound of the audio signal output to HDMI1 go out?
Does audio signal output from pin [14] of SC1503 (HDMI1 termi-
nal)?
YES
Check SC1503 and peripheral circuits.
NO
Does audio signal output from pin [39/HECP] of IC1504 (HDMI-
SW)?
SW)?
YES
Check the line between IC1504 and SC1503.
NO
Does audio signal input to pin [36/SPDIF_IN] of IC1504?
YES
Check IC1504 and peripheral circuits.
NO
Does audio signal (HDMI_OPT_OUT) output from pin [AA31/
CPU_ASPDIF] of IC3303 (Digital AV decode & Main CPU)?
CPU_ASPDIF] of IC3303 (Digital AV decode & Main CPU)?
YES
Check the line between IC3303 and IC1504.
NO
Check IC3303 and its peripheral circuits.
LC-40/46LE830E, RU/831E, S
6 – 10
No picture on the display (1)
The picture doesn't appear in all modes.
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.)
(IC2001, IC3501, IC3502, X3301, etc.)
Do above-mentioned LVDS signals output from connector
(P2601)?
(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).
PE (PNL_EN).
YES
LCD Controller Unit:
Do LVDS signals input to connector (LW) of 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.
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
In the case of LE830 series, refer to (A).
In the case of LE831 series, refer to (B).
In the case of LE831 series, refer to (B).
(B)
(A)
Does video signal (IFTU_AIF+/CVBS) output from pin [9]
of TUNER (TU1102)?
of TUNER (TU1102)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
Replace as required.
YES
Does video signal (TUNER_CVBS) input to pin [AK24/
CPU_CVBS0P] of IC3303 (Digital AV decode & Main
CPU)?
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)?
TUNER (TU1104)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
Replace as required.
YES
Does video signal (TUNER_CVBS) input to pin [AK24/
CPU_CVBS0P] of IC3303 (Digital AV decode & Main CPU)?
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)”.
LC-40/46LE830E, RU/831E, S
6 – 11
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)”.
No picture on the display (4)
Does not the picture come out when DTV (Satellite) is received?
Refer to “No sound (during the reception of TV (DIGITAL-Satellite) broadcasting)”.
[External input EXT1] No picture on the display (5)
Does not the picture of the CVBS signal input to EXT1 go out?
Does CVBS signal input to pin [20] of EXT1 (SC505)?
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
YES
Does CVBS signal input to pin [AK22/CPU_CVBS2P] of IC3303
(Digital AV decode & Main CPU)?
(Digital AV decode & Main CPU)?
NO
Check the line between SC505 and IC3303.
YES
Refer to “No picture on the display (1)”.
[External input EXT1] No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
Does Y/C video signal input to pins [20/Y, 15/C] of EXT1
(SC505)?
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
YES
Does Y/C signal input to pins [AK22/CPU_CVBS2P, AK19/
SC_PR0P] of IC3303 (Digital AV decode & Main CPU)?
SC_PR0P] of IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between SC505 and IC3303.
YES
Refer to “No picture on the display (1)”.
LC-40/46LE830E, RU/831E, S
6 – 12
[External input EXT1] No picture on the display (7)
Does not the picture of the R/G/B signal input to EXT1 go out?
Do RGB signals input to pins [15/RGB_IN_RED/C, 11/
RGB_IN_GREEN and 7/RGB_IN_BLUE] of EXT1 (SC505)?
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
YES
Do RGB signals from EXT1 (SC505) input to pins [AK19/
SC_PR0P, AM19/SC_PB0P and AM18/SC_Y0P] of IC3303 (Dig-
ital AV decode & Main CPU)?
SC_PR0P, AM19/SC_PB0P and AM18/SC_Y0P] of IC3303 (Dig-
ital AV decode & Main CPU)?
NO
Check the line between SC505 and IC3303.
YES
Refer to “No picture on the display (1)”.
[External input EXT2] No picture on the display (8)
Does not the picture of the CVBS signal input to EXT2 go out?
Does CVBS signal input to pin [5] of EXT2 (J511)?
Is CVBS_PLUG [4/CVBS1_PLUG] of J511 at “L”?
NO
Check the setting of an external input device that connects with
EXT2.
EXT2.
YES
Does CVBS signal input to pin [AJ23/CPU_CVBS1P] of IC3303
(Digital AV decode & Main CPU)?
(Digital AV decode & Main CPU)?
NO
Check the line between J511 and IC3303.
YES
Refer to “No picture on the display (1)”.
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