Read Sharp LC-70LE741E (serv.man11) Service Manual online
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 57
<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.
EXT1.
NO
Does CVBS signal output from pin [5] of IC510?
(CAPLESS VIDEO AMP with LPF)
(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.
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 LE645, LE648 series, refer to (A)?
In the case of LE646 series, refer to (B)?
In the case of LE646 series, refer to (B)?
(A)
(B)
Check the line between IC507 and TUNER (TU1102).
(Q1106 etc...)
(Q1106 etc...)
Check the line between IC507 and TUNER (TU1104).
(Q1106 etc...)
(Q1106 etc...)
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