Sharp LC-26AF3 M/H/X Service Manual page 43

TROUBLE SHOOTING TABLE
When EXT3 is used for external input>
XT3 in trouble.
Confirmation of the settings:
1) Is "INPUT SOURC " button on the remote control set up correctly?áááSee the operation manual and set "INPUT SOURC " to " XT1".
2) Is M NU-PICTUR -CONTRAST/BRIGHTN SS set to "MIN"?áááSet it to an appropriate level.
3) Check the connection to the external deviceáááConnect it correctly as per the operation manual for the device.
Is composite video Check external
signal sent to pin connection, input
NO
(5) of A/V-IN- setting, A/V-IN-
T RMINAL T RMINAL (J1202)
(J1202)? and peripheral
circuits.
YES
Check A/V-IN-
Is the composite
T RMINAL
video signal (IN3-
NO
(J1202) and
V) sent to input
peripheral circuits.
terminal pin (3) of
IC1203 (V-
S L CTOR)?
YES
Is the composite
Check IC1203 (V-
video signal
S L CTOR) and
NO
(CVBS) sent from
peripheral circuits.
output terminal pin
(51) of IC1203 (V-
S L CTOR)?
YES
Is the composite Check IC3300 (V-
video signal PROC SSOR),
NO
(CVBS1) sent to Q3706/Q3707 and
input terminal pin peripheral circuits.
(242) of IC3300 (V-
PROC SSOR)?
YES
Is LVDS signal (TA± - TD±) sent from pins (36) and (37) - (26) and (27) of IC3300 (V-PROC SSOR), and is CLK signal
(RCLK1±) sent from pin (28)/(29)?
Is the digital signal (RMS/GMS/BMS) sent from pins (27) and (34) - (47) and (50) of IC4601 (LVDS-R C IV R), and is SYNC
signal (HS/VS) sent from pin (3)/(5)?
Is digital RGB-right signal (RR**/RG**/RB**) sent from pins (203) and (2) - (16) and (23) of IC4502 (LCD-CONTROL), and is
digital RGB-left signal (LR**/LG**/LB**) sent from pins (26) and (33)- (47) and (54)?
Is digital RGB signal sent to pins (14) and (21) - (42) and (49) of LCD-CONN CTOR SC4651/4652?
No picture (5)
XT3-COMPON NT (Y, Pb and Pr) in
trouble.
Is IN3-Y signal sent Check external
to pin (6) of A/V-IN- connection, input
NO
T RMINAL (J1201), setting, A/V-IN-
and is Cb/C/r signal T RMINAL
sent to pins (4) and (J1201/1202) and
(6) of A/V-IN- peripheral circuits.
T RMINAL (J1201)?
YES
Is component signal Check A/V-IN-
(IN3-Y/Cb/Cr) sent to T RMINAL
NO
input terminal pins (J1201/1202) and
(33), (35) and (37) of peripheral circuits.
IC1203 (V-
S L CTOR)?
YES
Are component signals
Check IC1203 (V-
(Y, Cb and Cr) sent
S L CTOR) and
NO
from output terminal
peripheral circuits.
pins (60), (59) and (58)
of IC1203 (V-
S L CTOR)?
YES
Are component Check IC3300 (V-
signals (Y, Cb and PROC SSOR),
NO
Cr) sent to input Q3700 Ð Q3705
terminal pins (246), and peripheral
(232) and (225) of circuits.
IC3300 (V-
PROC SSOR)?
YES
YES
YES
YES
YES
Check the LCD panel.
43
LC-26AF3 M/H/X
LC-32AF3 M/H/X
LC-37AF3 M/H/X
(Continued)
XT3-Y/C in trouble.
Is Y/C signal sent Check external
to pins (3) and (4) connection, input
NO
of S-T RMINAL setting, S-
(J1200)? T RMINAL
(J1200) and
YES
peripheral circuits.
Is Y/C signal (IN3- Check S-
Y/C) sent to input T RMINAL
NO
terminal pins (5) (J1200) and
and (7) of IC1203 peripheral circuits.
(V-S L CTOR)?
YES
Is Y/C signal (Y/C-
Check IC1203 (V-
SIG) sent from output
S L CTOR) and
NO
terminal pins (52)
peripheral circuits.
and (50) of IC1203
(V-S L CTOR)?
YES
Is Y/C signal Check IC3300 (V-
(CVBS2/C-SIG1) PROC SSOR),
NO
sent to input Q3708/Q3709 and
terminal pins (244) peripheral circuits.
and (231) of
IC3300 (V-
PROC SSOR)?
YES
Check IC3300, pins
NO
(28) and (29) for
RCLK signal, and
peripheral circuits.
Check IC4601, pins
NO
(3) and (5) for
HS/VS signal, and
peripheral circuits.
Check IC4502 and
NO
peripheral circuits.
Check IC4502,
NO
LCD-
CONN CTOR,
SC4651/4652 and
peripheral circuits.