Sharp LC-40LE830E/RU Service Manual page 67

No picture appears on EXT1 connected monitor during the DTV reception.
Does CVBS signal output from pin [19] of EXT1 (SC505)?
Does CVBS signal output from pin [5] of IC510 (CAPLESS
VIDEO AMP with LPF)?
Does CVBS signal input to pin [3] of IC510?
Does CVBS signal output from pin [2] of IC507?
Is CVBS_OUT_MUTE [pin (1)] of IC507 at "H"?
Does CVBS signal input to pin [4] of IC507?
Does CVBS signal output from pin (AJ20/CPU_VDAC1_OUT) of
IC3303 (Digital AV decode & Main CPU)?
Refer to "No picture on the display (3) (4)".
Does not the signal input to Network go out?
Does the signal in/output to pins (1), (2), (3), (6) of LAN-jack
(J9501)?
Do signals in/output to pins of IC3303 (Digital AV decode & Main
CPU)?
Pins [AD32&AD31/CPU_DATMDI_RJ45_TPN, AE32&AE31/
CPU_DATMDI_RJ45_RPN]
Check IC3303 and its peripheral circuits.
<During external connection> No picture on the monitor
NO
NO
NO
NO
NO
NO
NO
[External input Network] No picture on the display
YES
YES
YES Check the setting of an external input device that connects with
EXT1.
YES Check the line between SC505 and IC510.
YES Check the peripheral circuits of IC510.
YES Check the line between IC507 and IC510.
YES Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
YES Check the peripheral circuits of IC507.
YES Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
NO Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
NO Check the line between IC3303 and J9501.
(T9501 etc...)
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LC-40/46LE830E, RU/831E, S