Read Sharp LC-90LE757E Service Manual online
LC-70LE747E/RU,80LE657E/RU,90LE757E/K/RU
6 – 12
<During external connection> No picture on the monitor
No picture appears on EXT1 connected monitor during the DTV 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 “H”
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 [4] of IC507?
YES
Check the peripheral circuits of IC507.
NO
Does CVBS signal output from pin(AU30/CPU_VDACX_OUT) of
IC3301(Digital AV decode & Main CPU) ?
IC3301(Digital AV decode & Main CPU) ?
YES
Check the line between IC3301 and IC507.
Check the peripheral circuits of IC3301.
Check the peripheral circuits of IC3301.
NO
Refer to “No picture on the display (3)(4)”.
[External input Network] No picture on the display
Does not the signal input to Network go out?
Does the signal in/output to pins(1),(2),(3),(6) of LAN-jack
(J9401)?
(J9401)?
NO
Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
(power-LED of hub, LINK-LED of hub)
YES
Do signals in/output to pins of IC3301 (Digital AV decode & Main
CPU)?
Pins [AU18&AT18/CPU_DATMDI_RJ45_TNP, AU17&AT17/
CPU_DATMDI_RJ45_RNP]
CPU)?
Pins [AU18&AT18/CPU_DATMDI_RJ45_TNP, AU17&AT17/
CPU_DATMDI_RJ45_RNP]
NO
Check the line between IC3301 and J9401.
(T9401 etc)
(T9401 etc)
YES
Check IC3301 and its peripheral circuits.
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