Sharp LC-40LE820E, Service Manual

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LC-40/46/52LE820E, LC-40/46LU820E
7 – 11
<During external connection> No picture on the monitor
No picture appears on EXT1connected monitor during the ATV/DTV reception.
Is CVBS signal output into pin (2) of EXT1 (SC505)?
YES Check the setting of an external input device that connects with
EXT1.
NO
Is CVBS signal output to pin (2) of IC504? YES Check the line between SC505 and IC504.
NO
Is TU_OUT_CVBS_MUTE [pin (1) of IC504] at “H”? YES Check the peripheral circuits of IC3302.
NO
Is CVBS signal input to pin (6) of IC504? YES Check the IC504 and their peripheral circuits.
NO
Is CVBS signal output to pin (A27) of IC3302 (Digital AV decode
& Main CPU)? YES Check the line between IC504 and IC3302.
NO
In the case that No picture appears on EXT1connected monitor during the ATV reception., refer to (A)
In the case that No picture appears on EXT1connected monitor during the DTV reception., refer to (B)
(A) (B)
Refer to “No picture on the display (2)” Refer to “No picture on the display (3)”
[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), (4) of LAN-jack
(J9501)?
NO Check the interface device and peripheral circuits. (power-LED of
hub, LINK-LED of hub)
YES
Does the signal in/out to pins (12, 11/TX+-), (10, 9/RX+-) of
IC9501? NO Check the line between J9501 and IC9501.
YES
Does the signal in/output to pins [18, 19, 47, 29, 41, 27, 23, 22/
ONDA6~13], [21, 20, 35, 36, 38, 39, 34/ONDD8~14], [28, 33/
N_ONDCE0, N_ONDCE1] of LAN-jack (J9501)? NO Check IC9501 and its peripheral circuits.
YES
Does the signal in/output to pins [A8, B8, C9, C8, A7, F10, A4,
B4/ONDA6~13], [D13, F13, D11, E11, F12, E12, E13/
ONDD8~14], [C6, B3/N_ONDCE0, N_ONDCE1] of IC3302 (Digi-
tal AV decode & Main CPU)? NO Check the line between X9501 and IC9501.
Check the crystal X9501. (SCA219WJ)
YES
Check IC9501 and its peripheral circuits.