LC-70LE741E (serv.man11). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 58

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LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 58
<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)?
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 IC3303 and IC507.
Check the peripheral circuits of IC3303.
NO
Does CVBS signal input to pin [4] of IC507?
YES
Check the peripheral circuits of IC507.
NO
Does CVBS signal output from pin (AJ20/CPU_VDAC1_OUT) of 
IC3303 (Digital AV decode & Main CPU)?
YES
Check the line between IC3303 and IC507.
Check the peripheral circuits of IC3303.
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 
(J9501)?
NO
Check the interface device and peripheral circuits.
(power-LED of hub, LINK-LED of hub)
YES
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] 
NO
Check the line between IC3303 and J9501.
(T9501 etc...)
YES
Check IC3303 and its peripheral circuits.

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