Sharp LC-37AD5E Service Manual page 57

<During external connection>
SCART1:
No picture appears on EXT1 - connected monitor during the tuner
(U/V) reception.
Checklist:
1) Are input terminal on back of TV and "INPUT SOURCE" button
set "INPUT SOURCE" appropriately.
2) Is the Signal Type (item) in MENU-Option-Input Select equal to Signal Type of an external device? ••• Set it to "CVBS", "Y/C" or "RGB".
3) Is ANT-CABLE disconnected or connected improperly? ••• Connect it correctly as per the operation manual.
4) The picture is sent to the monitor in a CVBS signal if the source during display is TV, CVBS or Y/C of EXT1-3.
When sent by component, etc., that signal is not sent to the monitor.
5) When the monitor picture is not sent and is not displayed on the monitor, refer to "No picture" for each terminal.
6) The video output from EXT1 is not the monitor output (output of the picture now watching).
The picture of the last selected TV channel is always sent to EXT1. (Specification)
Is video signal sent to pin (19) of SCART1 (J1101)?
Is video signal (V-OUT1) sent from pin (2) of IC1102 (SW)?
Is video signal (V-OUT1) sent from pin (195) of IC3002 (VCT)?
Is video signal (CVBS) sent to pin (191) of lC3002?
Is video signal (CVBS) sent from pin (17) of IC201 (IF-DEMOD)?
Is video signal (IF) sent from pin (17) of tuner (TU201)?
Check +5V (CONT) power supply pins (1) and (2), I2C line pins
(15) and (14) of tuner (TU201) and peripheral circuits.
No picture on the monitor (1)
NO
NO
NO
NO
NO
NO
on the remote control set up correctly? ••• See the operation manual and
YES Check SCART1, external connection or input setting.
YES Check SCART1 (J1101) and peripheral circuits.
YES Check IC1102 (SW), Connector (SC2702, P1101) and peripheral
circuits.
YES Check power supply of IC3002 and peripheral circuits.
YES Check CONNECTOR (P201, SC2705) and peripheral circuits.
YES Check IC201, FL201 (SAW-FIL), Q211 and peripheral circuits.
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LC-37AD5E