Sharp LC-26SB25E Service Manual ▷ View online
2008-03-14
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
41
No sound from external input devices (4)
↓
Does not the sound of the audio signal input to VGA go out?
MAIN UNIT:
↓
↓YES
↓YES
No sound from external input devices (5)
↓
Does not the sound of the audio signal input to HDMI1/2/3 go out?
↓
↓YES
Is the audio signal properly sent to pin (2) (VGA_AudioLIN) and pin
(3) (VGA_AudioRIN) of CN555?
(3) (VGA_AudioRIN) of CN555?
NO
Check the connection to CN555 and the external input device.
Refer to “No sound output in all modes”.
Is the audio signal properly sent to pin (K25) (VGA_LIN) and pin
(K26) (VGA_RIN) of IC U400?
(K26) (VGA_RIN) of IC U400?
NO
Check the line between CN555 and IC U400.
Refer to “No sound output in all modes”.
Is picture of the signal input from HDMI1/2/3 displayed?
NO
Refer to “Does not the picture of the HDMI signal input to
HDMI1/2/3 go out?”.
HDMI1/2/3 go out?”.
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
42
The audio signal is not output (1)
↓
The audio signal of UHF/VHF is not output from SCART1.
TEREMINAL UNIT:
↓
↓NO
↓NO
The audio signal is not output (2)
↓
The audio signal of UHF/VHF/MONITOR is not output from SCART2.
TEREMINAL UNIT:
↓
↓NO
↓NO
The audio signal is not output (3)
↓
No audio signal output from LINE_AUDIO_OUTPUT terminal.
TEREMINAL UNIT:
↓
↓NO
↓NO
Is audio signal output from IC U400 sent to pin (2)(LRCLK) and pin
(3)(DIN) and pin (4)(BCLK) and pin(13)(MCLK) of IC U602?
(3)(DIN) and pin (4)(BCLK) and pin(13)(MCLK) of IC U602?
Is audio signal output from IC U602 sent to pin (3)(SCT1_AUL-
OUT) and pin(1)(SCT1_AUR-OUT) of SCART1(CN500)?
OUT) and pin(1)(SCT1_AUR-OUT) of SCART1(CN500)?
YES
Check the connection to SCART1 and external devices.
YES
Check the line between IC U400 and IC U602.
Check IC U400 and its peripheral circuits.
Is the audio signal output from IC U400 of pin (E26) (AL2) and pin
(F25) (AR2) sent to pin (2)(1IN-) and pin (6)(2IN-) of IC U603?
(F25) (AR2) sent to pin (2)(1IN-) and pin (6)(2IN-) of IC U603?
Is audio signal output from IC U603 sent to
pin(3)(SCT2_AUL_OUT) and pin(1)(SCT2_AUR_OUT) of
pin(3)(SCT2_AUL_OUT) and pin(1)(SCT2_AUR_OUT) of
YES
Check the connection to SCART2 and external devices.
YES
Check the line between IC U400 and IC U603.
Check IC U400 and its peripheral circuits.
Is the audio signal output from IC U400 of pin (E26) (AL2) and pin
(F25) (AR2) sent to pin (2)(1IN-) and pin (6)(2IN-) of IC U603?
(F25) (AR2) sent to pin (2)(1IN-) and pin (6)(2IN-) of IC U603?
Is audio signal output from IC U603 sent to pin (2)(L_OUT) and pin
(4)(R_OUT) of LINE_AUDIO_OUT connector(CN556)?
(4)(R_OUT) of LINE_AUDIO_OUT connector(CN556)?
YES
Check the connection to LINE_AUDIO_OUT and external
devices.
devices.
YES
Check the line between IC U400 and IC U603.
Check IC U400 and its peripheral circuits.
2008-03-14
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
43
The audio signal is not output (4)
↓
No audio signal output from SPDIF_OUTPUT terminal.
TEREMINAL UNIT:
↓
↓NO
The audio signal is not output (5)
↓
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
↓
↓YES
↓YES
↓YES
Check IC U400 and its peripheral circuits.
Is ASPDIF audio signal output from pin (B22) of IC U400 to pin (6)
of connector CN553?
of connector CN553?
YES
Check the connection to SPDIF_OUT and external devices.
Is the audio signal output from IC U601 to pin (2) (HPOUTL) and
pin (3) (HPOUTR) of headphone terminal CN602?
pin (3) (HPOUTR) of headphone terminal CN602?
Is the HPDET signal input into pin (C20) of IC U400 from pin (7) of
a headphone terminal (CN602)?
a headphone terminal (CN602)?
NO
Check the connection to CN602 and external headphone is plug
in well.
in well.
NO
Check the line between IC U601 and CN602.
Check IC U400 and its peripheral circuits.
Is the audio signal output from IC U400 of pin (F26) (AL1) and pin
(G25) (AR1) sent to pin (2)(VIN1) and pin (6)(VIN2) of IC U601?
(G25) (AR1) sent to pin (2)(VIN1) and pin (6)(VIN2) of IC U601?
NO
Check the line between IC U400 and IC U601.
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
44
No picture on the display (1)
↓
The picture doesn't appear in all modes.
MAIN UNIT:
↓
↓NO
YES
↓YES
PANEL_UNIT:
↓YES
↓YES
No picture on the display (2)
↓
Does not the picture come out when VHF/UHF is received?
TERMINAL UNIT:
↓
MAIN_UNIT:
↓YES
↓YES
Is LCD controller's control signal normal?
Is the above-mentioned LVDS signals output to connector CN750?
NO
Check the line between IC U400 and CN750.
NO
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
PANEL_VCC_ON/OFF, and it peels off and whether normality is
checked.
PANEL_VCC_ON/OFF, and it peels off and whether normality is
checked.
Check the panel module.
Similarly, is the LVDS signal input to connector of the panel
module?
module?
NO
Wire harness is checked.
Is LVDS signal output from 1st_channel and 2nd_channel of IC U400 in each mode?
(A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CLK1N/CLK1P),(A4N/A4P),(A5N/A5P),(A6N/A6P),(A7N/A7P),(CLK2N/CLK2P)
(A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CLK1N/CLK1P),(A4N/A4P),(A5N/A5P),(A6N/A6P),(A7N/A7P),(CLK2N/CLK2P)
Check IC U400 and its peripheral control circuits.
Is picture signal input from pin (21) of TUNER (TU200) to pin
(AC26) of IC U400?
(AC26) of IC U400?
Is TUNER_CVBS signal output from pin (21) of TUNER (TU200)?
NO
Check whether I2C is normally accessed between TU200 and IC
U231 and IC U400.
U231 and IC U400.
NO
Check the line between IC U400 and TU200.
Refer to “The picture doesn't appear in all modes.”
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