Sharp LC-19SH7E Service Manual / Specification ▷ View online
2008-03-14
LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
45
<External input AV1(Component)>No picture on the display (10)
↓
Does not the picture of the component video signal input to Component go out?
TERMINAL_UNIT:
↓
MAIN_UNIT:
↓YES
↓YES
< During external connection > No picture on the monitor (1)
↓
No picture appears on SCART1 - connected monitor during the tuner (U/V) reception.
↓
TERMINAL_UNIT:
↓
↓NO
↓NO
Is Component Y/Pb/Pr signal sent to pin (2)/Y, (4)/Pb, (6)/Pr of
AV1(CN552) ?
AV1(CN552) ?
NO
Check the setting of an external input device that connects of
CN552.
CN552.
Refer to “The picture doesn't appear in all modes.”
Is Component Y/Pb/Pr signal sent to pin (AE21)/Y, (AD22)/Pb,
(AF22)/Pr of IC U400?
(AF22)/Pr of IC U400?
NO
Check the line between IC U400 and CN552.
Is CVBS signal output into pin (19) of CN500 (SCART1)?
YES
Check the setting of an external input device that connects of
CN500.
CN500.
Refer to “The picture doesn't appear in all modes.”
Is TUNER_CVBS signal output into pin (21) of CN500 (SCART1)?
YES
Check the line between CN500 and TU200.
Checklist:
1) Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? …Set it to “CVBS”, “Y/C”, “RGB”, “AUTO”.
2) Is ANT-CABLE disconnected or connected improperly? …Connect it correctly as per the operation manual.
3) The picture is sent to the monitor in a CVBS signal if the source during display is ATV/DTV, CVBS or Y/C of SCART1, AV3.
1) Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? …Set it to “CVBS”, “Y/C”, “RGB”, “AUTO”.
2) Is ANT-CABLE disconnected or connected improperly? …Connect it correctly as per the operation manual.
3) The picture is sent to the monitor in a CVBS signal if the source during display is ATV/DTV, CVBS or Y/C of SCART1, AV3.
When sent by component, etc., that signal is not sent to the monitor.
4) When the monitor picture is not sent and is not displayed on the monitor, refer to “No picture” for each terminal.
5) The video output from SCART1 is not the monitor output (output of the picture now watching).
5) The video output from SCART1 is not the monitor output (output of the picture now watching).
The picture of the last selected TV channel is always sent to SCART1. (Specification)
LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
46
< During external connection > No picture on the monitor (2)
AVOUT:
↓
No picture from SCART1 appears on AVOUT-connected monitor.
NOTE: Normally, if the screen during display is sent to SCART1, no picture is sent to AVOUT.
NOTE: Normally, if the screen during display is sent to SCART1, no picture is sent to AVOUT.
↓
TERMINAL_UNIT:
↓
↓NO
↓NO
Is CVBS signal output into pin (2) of CN501?
YES
Check the setting of an external input device that connects of
CN501.
CN501.
Refer to “The picture doesn't appear in all modes.”
Is CVBS signal output from pin (A13) of IC U400 into pin (2) of
CN501 ?
CN501 ?
YES
Check the line between CN501 and IC U400.
Checklist:
1) Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? …Set it to “CVBS”, “Y/C”, “AUTO”.
2) The picture is sent to the monitor in a CVBS signal if the source during display is TV, CVBS or Y/C of SCART1, AV3.
1) Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? …Set it to “CVBS”, “Y/C”, “AUTO”.
2) The picture is sent to the monitor in a CVBS signal if the source during display is TV, CVBS or Y/C of SCART1, AV3.
When sent by component, etc., that signal is not sent to the monitor.
3) When the monitor picture is not sent and is not displayed on the monitor, refer to “No picture” for each terminal.
4) The video output from SCART1 is not the monitor output (output of the picture now watching).
4) The video output from SCART1 is not the monitor output (output of the picture now watching).
The picture of the last selected TV channel is always sent to SCART1. (Specification)
2008-03-14
LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
47
26” TROUBLESHOOTING TABLE
Power unit operation check.
↓
LINE_FILTER_UNIT:
↓ YES
POWER_UNIT
↓YES
↓YES
↓YES
↓YES
Are the power cord and harness in the unit properly connected?
NO
Connect the power cord and harness properly, and turn on the
power.
power.
Is F901/F902 normal?
NO
LINE_FILTER_UNIT:
Isn't RV901,L901,C904,L902,C903,C902,RV903, etc. out of
order? Moreover, whether the short-circuit with the
circumference circuit is checked.
POWER_UNIT:
BD901, FB905, C905, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
Isn't RV901,L901,C904,L902,C903,C902,RV903, etc. out of
order? Moreover, whether the short-circuit with the
circumference circuit is checked.
POWER_UNIT:
BD901, FB905, C905, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
Is BD901 (+320V) output? (Set the main power SW to OFF.)
* When power on/off switch is on ‧‧‧ About +400V
* When power on/off switch is on ‧‧‧ About +400V
Does the PFC circuit operate normally?
(L906, Q901, D902, D903, IC901 and etc. And, the circuit around
the protection circuit etc. is checked.)
(L906, Q901, D902, D903, IC901 and etc. And, the circuit around
the protection circuit etc. is checked.)
NO
Is a voltage of +5V applied to pin (12,13) of connector (CN902)?
(Set the main power SW to OFF.)
(Set the main power SW to OFF.)
Does the switching circuit operate normally?
Check circuit around the primary side (T901, IC931, Q931,
ZD931, ZD930, ZD980, ZD981, etc.), the secondary side (D935,
L980, etc.), the AC_DET circuit (IC932, IC982, etc.), and the
protection circuit.
Check circuit around the primary side (T901, IC931, Q931,
ZD931, ZD930, ZD980, ZD981, etc.), the secondary side (D935,
L980, etc.), the AC_DET circuit (IC932, IC982, etc.), and the
protection circuit.
NO
Are +24V output as for the power on/off switch when it is on?
NO
Does the inverter circuit operate normally?
Check circuit around the primary side (T902,Q951,Q952,IC951,
D951,D952, etc.), the secondary side (D955, L932, ZD967,
IC952, IC953, etc.), the STANDBY circuit (Q988, etc.), and the
protection circuit.
Check circuit around the primary side (T902,Q951,Q952,IC951,
D951,D952, etc.), the secondary side (D955, L932, ZD967,
IC952, IC953, etc.), the STANDBY circuit (Q988, etc.), and the
protection circuit.
Similarly, is +12V output as for the power on/off switch when it is
on?
on?
NO
Check +12V circuit of D956, L931, etc.
LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
48
The sound is not emitted from the speaker though the picture has come out.
↓
No sound output in all modes?
TEREMINAL UNIT:
↓
↓YES
↓YES
↓YES
↓YES
↓YES
No sound (during the reception of TV(ANALOG) broadcasting)
↓
Does not the sound go out though the picture has come out when UHF/VHF is received?
TEREMINAL UNIT:
↓
↓YES
↓YES
Is the audio signal output of pin (H26) (AL0) and pin (H25) (AR0) of
IC U400 normal?
IC U400 normal?
NO
Check IC U400 and its peripheral circuits.
Is audio signal input to pin (2)(L), pin (14)(R) of IC U600 (AMP)?
NO
Check the line between IC U605 and IC U600.
Is MUTE circuit [AMP_MUTE_LINE, POWERUP_LINE] normal?
Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of
CN600 (AOUDIO-CONNECTOR) normal?
CN600 (AOUDIO-CONNECTOR) normal?
NO
Check the AMP_MUTE_LINE and POWERUP_LINE. (Q600,
etc.)
etc.)
NO
Check IC U600 and its peripheral circuits.
Check Speaker Box (right and left) and wire harness.
Is the SIF signal output from pin (21) of TUNER (TU201)?
Is the SIF signal sent to pin (AB25) and pin (AB26) of IC U400?
NO
Check the tuner and its peripheral circuits. Replace as required.
NO
Check IC U400 its peripheral circuits.
Refer to “No sound output in all modes”.
Is the audio signal output of pin (17) (PGA2OUTL) and pin (18)
(PGA2OUTR) of IC U605 normal?
(PGA2OUTR) of IC U605 normal?
NO
Check IC U605 and its peripheral circuits.
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