Sharp LC-26P50E (serv.man9) Service Manual ▷ View online
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
38
TROUBLE SHOOTING TABLE
(Continued)
<On input of the tuner (U/V)>
No picture appears on LCD during the tuner (U/V) reception.
Confirmation of the settings:
1) Is "INPUTSOURCE" button
on the remote control set up correctly? ¥¥¥ See the operation manual and set "INPUTSOURCE" to "TV".
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS set to "MIN"? ¥¥¥ Set it to an appropriate level.
3) Is ANT-cable disconnected, or incorrectly connected? ¥¥¥ Connect it correctly as per the operation manual.
NO
NO
Is the video signal (IF) sent
from pin (11) of tuner
(TU1100)?
Check the tuner (TU1100)
and peripheral circuits.
NO
YES
YES
YES
Is video signal sent from pin
(17) of IC1104 (IF-DEMOD)?
Check SF1102 (SAW-FIL),
IC1104 and peripheral
circuits.
NO
Is the video signal (CVBS-
TUNER) sent to pin (17) of
IC1203 (V-SEL)?
YES
Is CVBS signal sent from pin (51) of IC1203?
Check IC1100 (VCA),
IC1203 (V-SEL) and
peripheral circuits.
Check 9V power line pins (6), (47) and (57) of IC1203 (V-SEL) and
peripheral circuits.
NO
YES
Is CVBS1 signal sent to pin (242) of IC3300 (V-PROCESSOR)?
Check IC3300 (V-PROCESSOR), Q3706/3707 and peripheral
circuits.
NO
YES
Is LVDS video signal (TA1± - TD1±) sent from pins (36)/(37) -
(25)/(27) of IC3300 (V-PROCESSOR), and is CLK signal
(RCLK1±) sent from pin (28)/(29)?
Check IC3300 (V-PROCESSOR) or peripheral circuits.
NO
YES
Is R/G/B digital video signal (RMS/GMS/BMS) sent from pin [27-
34]/[37-42]/[47-50] of IC4601 (LVDS-RECEIVER), and is SYNC
signal (HS/VS) sent from pin (3)/(5)?
Check IC4601 (LVDS-RECEIVER) and peripheral circuits.
NO
YES
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)?
YES
Check LCD connector SC4651/SC4652 or LCD-PANEL-UNIT.
Check IC4502 (LCD-CTL) and peripheral circuits.
No picture (1)
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
39
TROUBLE SHOOTING TABLE
(Continued)
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LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
40
TROUBLE SHOOTING TABLE
(Continued)
EXT1 in trouble.
Confirmation of the settings:
1) Is "INPUT SOURCE" button
on the remote control set up correctly?áááSee the operation manual and set "INPUT SOURCE" to "EXT1".
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS 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.
EXT1-RGB in trouble.
EXT1-Y/C in trouble.
NO
Is composite video
signal sent to pin
(20) of SCART1
(SC1201)?
Check external
connection, input
setting, SCART1
(SC1201) and
peripheral circuits.
Is RGB signal sent
to pins (15), (11)
and (7) of SCART1
(SC1201)?
NO
Check external
connection, input
setting, SCART1
(SC1201) and
peripheral circuits.
Is Y/C signal sent
to pins (20) and
(15) of SCART1
(SC1201)?
NO
Check external
connection, input
setting, SCART1
(SC1201) and
peripheral circuits.
YES
YES
YES
NO
Is the composite
video signal (IN1-
V) sent to input
terminal pin (65) of
IC1203 (V-
SELECTOR)?
Check SCART1
(SC1201) and
peripheral circuits.
Are RGB signals
(R1, G1 and B1)
sent to input terminal
pins (25), (21) and
(23) of IC1203 (V-
SELECTOR)?
NO
Check SCART1
(SC1201) and
peripheral circuits.
Is Y/C signal (IN1-
Y/C1) sent to input
terminal pins (67)
and (69) of IC1203
(V-SELECTOR)?
NO
Check SCART1
(SC1201) and
peripheral circuits.
YES
YES
YES
NO
Is the composite
video signal
(CVBS) sent from
output terminal pin
(51) of IC1203 (V-
SELECTOR)?
Check IC1203 (V-
SELECTOR) and
peripheral circuits.
Is RGB signal
(R/G/B-SIG) sent
from output terminal
pins (54), (56) and
(55) of IC1203 (V-
SELECTOR)?
NO
Check IC1203 (V-
SELECTOR) and
peripheral circuits.
Is Y/C signal (Y/C-
SIG) sent from
output terminal
pins (52) and (50)
of IC1203 (V-
SELECTOR)?
NO
Check IC1203 (V-
SELECTOR) and
peripheral circuits.
YES
YES
YES
YES
NO
Is the composite
video signal
(CVBS1) sent to
input terminal pin
(242) of IC3300 (V-
PROCESSOR)?
Check IC3300 (V-
PROCESSOR),
Q3706/Q3707 and
peripheral circuits.
Is RGB signal
(R/G/B-SIG3) sent
to input terminal
pins (54), (48) and
(43) of IC3701
(A/D-CONV)?
NO
NO
Check pins (54),
(56) and (55) of
IC1203 (V-SEL),
Q3712/11/10 and
peripheral circuits.
Check pins (66)
and (64) for AD-
HS/VS signal,
IC3701 (A/D-
CONV) and
peripheral circuits.
Is Y/C signal
(CVBS2/C-SIG1)
sent to input
terminal pins (244)
and (231) of
IC3300 (V-
PROCESSOR)?
NO
NO
Check IC3300 (V-
PROCESSOR),
Q3708/Q3709 and
peripheral circuits.
YES
YES
YES
Is digital signal
(R/G/B-8bit) sent to
input terminal pins
(45/69) - (55/46) of
IC3300 (V-
PROCESSOR)?
Is LVDS signal (TA± - TD±) sent from pins (36) and (26) - (27) and (31) of IC3300 (V-PROCESSOR), and is CLK signal
(RCLK1±) sent from pin (28)/(29)?
Check IC3300, pins
(28) and (29) for
RCLK signal, and
peripheral circuits.
YES
NO
Is digital RGB signal sent to pins (14) and (21) - (42) and (49) of LCD-CONNECTOR SC4651/4652?
Check IC4502,
LCD-
CONNECTOR,
SC4651/4652 and
peripheral circuits.
YES
NO
NO
Is the digital signal (RMS/GMS/BMS) sent from pins (27) and (34) - (47) and (50) of IC4601 (LVDS-RECEIVER), and is SYNC
signal (HS/VS) sent from pin (3)/(5)?
Check IC4601, pins
(3) and (5) for
HS/VS signal, and
peripheral circuits.
YES
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)?
YES
Check the LCD panel.
Check IC4502 and
peripheral circuits.
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
41
TROUBLE SHOOTING TABLE
(Continued)
EXT2 in trouble.
Confirmation of the settings:
1) Is "INPUT SOURCE" button
on the remote control set up correctly?áááSee the operation manual and set "INPUT SOURCE" to "EXT2".
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS 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.
EXT2-RGB in trouble.
EXT2-Y/C in trouble.
NO
Is composite video
signal sent to pin
(20) of SCART2
(SC1200)?
Check external
connection, input
setting, SCART2
(SC1200) and
peripheral circuits.
Is RGB signal sent
to pins (15), (11)
and (7) of SCART2
(SC1200)?
NO
Check external
connection, input
setting, SCART2
(SC1200) and
peripheral circuits.
Is Y/C signal sent
to pins (20) and
(15) of SCART2
(SC1200)?
NO
Check external
connection, input
setting, SCART2
(SC1200) and
peripheral circuits.
YES
YES
YES
NO
Is the composite
video signal (IN2-
V) sent to input
terminal pin (77) of
IC1203 (V-
SELECTOR)?
Check SCART2
(SC1200) and
peripheral circuits.
Are RGB signals
(R2, G2 and B2)
sent to input terminal
pins (31), (27) and
(29) of IC1203 (V-
SELECTOR)?
NO
Check SCART2
(SC1200) and
peripheral circuits.
Is Y/C signal (IN2-
Y/C2) sent to input
terminal pins (79)
and (1) of IC1203
(V-SELECTOR)?
NO
Check SCART2
(SC1200) and
peripheral circuits.
YES
YES
YES
NO
Is the composite
video signal
(CVBS) sent from
output terminal pin
(51) of IC1203 (V-
SELECTOR)?
Check IC1203 (V-
SELECTOR) and
peripheral circuits.
Is RGB signal
(R/G/B-SIG) sent
from output terminal
pins (54), (56) and
(55) of IC1203 (V-
SELECTOR)?
NO
Check IC1203 (V-
SELECTOR) and
peripheral circuits.
Is Y/C signal (Y/C-
SIG) sent from
output terminal
pins (52) and (50)
of IC1203 (V-
SELECTOR)?
NO
Check IC1203 (V-
SELECTOR) and
peripheral circuits.
YES
YES
YES
YES
NO
Is the composite
video signal
(CVBS1) sent to
input terminal pin
(242) of IC3300 (V-
PROCESSOR)?
Check IC3300 (V-
PROCESSOR),
Q3706/Q3707 and
peripheral circuits.
Is RGB signal
(R/G/B-SIG3) sent
to input terminal
pins (54), (48) and
(43) of IC3701
(A/D-CONV)?
NO
NO
Check pins (54),
(56) and (55) of
IC1203 (V-SEL),
Q3712/11/10 and
peripheral circuits.
Check pins (66)
and (64) for AD-
HS/VS signal,
IC3701 (A/D-
CONV) and
peripheral circuits.
Is Y/C signal
(CVBS2/C-SIG1)
sent to input
terminal pins (244)
and (231) of
IC3300 (V-
PROCESSOR)?
NO
NO
Check IC3300 (V-
PROCESSOR),
Q3708/Q3709 and
peripheral circuits.
YES
YES
YES
Is digital signal
(R/G/B-8bit) sent to
input terminal pins
(45/69) - (55/46) of
IC3300 (V-
PROCESSOR)?
Is LVDS signal (TA± - TD±) sent from pins (36) and (37) - (26) and (27) of IC3300 (V-PROCESSOR), and is CLK signal
(RCLK1±) sent from pin (28)/(29)?
Check IC3300, pins
(28) and (29) for
RCLK signal, and
peripheral circuits.
YES
NO
Is digital RGB signal sent to pins (14) and (21) - (42) and (49) of LCD-CONNECTOR SC4651/4652?
Check IC4502,
LCD-
CONNECTOR,
SC4651/4652 and
peripheral circuits.
YES
NO
NO
Is the digital signal (RMS/GMS/BMS) sent from pins (27) and (34) - (47) and (50) of IC4601 (LVDS-RECEIVER), and is SYNC
signal (HS/VS) sent from pin (3)/(5)?
Check IC4601, pins
(3) and (5) for
HS/VS signal, and
peripheral circuits.
YES
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)?
YES
Check the LCD panel.
Check IC4502 and
peripheral circuits.
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