Read Sharp LC-90LE757E Service Manual online
LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU
6 – 11
<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)
(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 IC3301 and IC507 .
Check the peripheral circuits of IC3301 ?
Check the peripheral circuits of IC3301 ?
NO
Does CVBS signal input to pin [6] of IC507 ?
YES
Check the peripheral circuits of IC507 .
NO
Check the line between IC507 and TUNER(TU1101).
(Q1106 etc)
(Q1106 etc)
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