Sharp LC-19LE320E Service Manual ▷ View online
2008-03-14
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
101
<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
Is Component Y/Pb/Pr signal sent to pin (2)/Y, (4)/Pb, (6)/Pr of
AV1(CN111) ?
AV1(CN111) ?
NO
Check the setting of an external input device that connects of
CN111.
CN111.
Refer to “The picture doesn't appear in all modes.”
Is Component Y/Pb/Pr signal sent to pin (AU26)/Y, (AT27)/Pb,
(AP27)/Pr of IC U401?
(AP27)/Pr of IC U401?
NO
Check the line between IC U401 and CN111.
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
102
< 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
< During external connection > No picture on the monitor (2)
SCART2:
↓
No picture from SCART1 appears on SCART2-connected monitor.
NOTE: Normally, if the screen during display is sent to SCART2, no picture is sent to SCART2.
NOTE: Normally, if the screen during display is sent to SCART2, no picture is sent to SCART2.
↓
TERMINAL_UNIT:
↓
↓NO
↓NO
Is CVBS signal output into pin (19) of CN151 (SCART1)?
YES
Check the setting of an external input device that connects of
CN151.
CN151.
Refer to “The picture doesn't appear in all modes.”
Is U401 pin (AT31) CVBS signal output into pin (19) of CN151
(SCART1)?
(SCART1)?
YES
Check the line between CN151 and U401.
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)
Is CVBS signal output into pin (19) of CN152 (SCART2)?
YES
Check the setting of an external input device that connects of
CN152.
CN152.
Refer to “The picture doesn't appear in all modes.”
Is CVBS signal output from pin (AP31) of IC U401 into pin (19) of
CN152 (SCART2)?
CN152 (SCART2)?
YES
Check the line between CN152 and IC U401.
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 SCART1-2, 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 SCART1-2, 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-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
103
37” TROUBLESHOOTING TABLE
Power unit operation check.
↓
LINE_FILTER_UNIT:
↓ YES
POWER_UNIT
↓YES
↓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,C901,L901,C904,C902,C903,L902,RV903, etc. out
of order? Moreover, whether the short-circuit with the
circumference circuit is checked.
POWER_UNIT:
BD901, FB905, C910, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
Isn't RV901,C901,L901,C904,C902,C903,L902,RV903, etc. out
of order? Moreover, whether the short-circuit with the
circumference circuit is checked.
POWER_UNIT:
BD901, FB905, C910, 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.)
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, C943, etc.), and the
protection circuit.
Check circuit around the primary side (T902,Q951,Q952,IC951,
D951,D952, etc.), the secondary side (D955, C943, 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 D962, L931, etc.
Are +70.6V output as for the power on/off switch when it is on?
NO
Does the inverter circuit operate normally?
Check circuit around the second side (L907, Q991, D985, IC902,
Q903 etc.)
Check circuit around the second side (L907, Q991, D985, IC902,
Q903 etc.)
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
104
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
Is the audio signal output of pin U36 (AR3), V37 (AL3) of IC U401
normal?
normal?
NO
Check IC U401 and its peripheral circuits.
Is audio signal input to pin (4)(L), pin (11)(R) of IC U601 (AMP)?
NO
Check the line between IC U605 and IC U601.
Is MUTE circuit [ Shutdown, OFF_MUTE] normal?
Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of
CN601 (AOUDIO-CONNECTOR) normal?
CN601 (AOUDIO-CONNECTOR) normal?
NO
Check the Mute circuit. (Q601, Q602 etc.)
Check IC U601 and its peripheral circuits.
Check Speaker Box (right and left) and wire harness.
NO
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