Sharp Aquos LC-60LE740E, Service Manual

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LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
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<During external connection> No picture on the monitor
No picture appears on EXT1 connected monitor during the ATV reception.
Does CVBS signal output from pin [19] of EXT1 (SC505)?
YES Check the setting of an external input device that connects with
EXT1.
NO
Does CVBS signal output from pin [5] of IC510?
(CAPLESS VIDEO AMP with LPF) YES Check the line between SC505 and IC510.
NO
Does CVBS signal input to pin [3] of IC510? YES Check the peripheral circuits of IC510.
NO
Does CVBS signal output from pin [2] of IC507? YES Check the line between IC507 and IC510.
NO
Is CVBS_OUT_MUTE [pin (1)] of IC507 at “L”? YES Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
NO
Does CVBS signal input to pin [6] of IC507? YES Check the peripheral circuits of IC507.
NO
In the case of LE840, LE843 series, refer to (A)?
In the case of LE841 series, refer to (B)?
(A) (B)
Check the line between IC507 and TUNER (TU1102).
(Q1106 etc...) Check the line between IC507 and TUNER (TU1104).
(Q1106 etc...)