LC-60LE857E (serv.man3). March 2013 - Sharp TV Service Manual (repair manual). Page 53

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LC-60LE855E/K,60/70LE857E/RU,858E,70LE857K
6 – 7
No picture on the display (2)
Does not the picture come out when VHF/UHF is received?
In the case of LE855.858 series , refer to (A)
(B)
In the case of LE857 series , refer to (B)
(A)
Does  video signal (CVBS) output from pin[9] of TUNER(TU1105) ?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does video signal (TUNER_CVBS) input to pin [AN29/
CPU_CVBS0P] of IC3303(Digital AV decode & Main CPU) ?
NO
Check the line between TU1105 and IC3301.
(Q1106, etc...)"
YES
Refer to “No picture on the display (1)”
(B)
Does  video signal (CVBS) output from pin[9] of TUNER(TU1101) ?
NO
Check the tuner and its peripheral circuits.
Replace as required.
YES
Does video signal (TUNER_CVBS) input to pin [AN29/
CPU_CVBS0P] of IC3303(Digital AV decode & Main CPU) ?
NO
Check the line between TU1101 and IC3301.
(Q1106, etc...)"
YES
Refer to “No picture on the display (1)”
No picture on the display (3)
Does not the picture come out when DTV is received?
Refer to “No sound (during the reception of TV(DIGITAL) broadcasting)”
No picture on the display (4)
Does not the picture come out when DTV(Satellite) is received?
Refer to “No sound (during the reception of TV(DIGITAL-Satellite) broadcasting)”
[External input EXT1] No picture on the display (5)
Does not the picture of the CVBS signal input to EXT1 go out?
Does CVBS signal input to pin[20] of EXT1 (SC505) ?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Does CVBS signal input to pin [AR30/CPU_CVBS2P] of IC3301
 (Digital AV decode & Main CPU)
NO
Check the line between SC505 and IC3301.
YES
Refer to “o picture on the display (1)”

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