Sharp LC-26P50E (serv.man9) Service Manual ▷ View online
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
42
TROUBLE SHOOTING TABLE
(Continued)
EXT3 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.
EXT3-COMPONENT (Y, Pb and Pr) in
trouble.
EXT3-Y/C in trouble.
NO
Is composite video
signal sent to pin
(5) of A/V-IN-
TERMINAL
(J1202)?
Check external
connection, input
setting, A/V-IN-
TERMINAL (J1202)
and peripheral
circuits.
Is IN3-Y signal sent
to pin (6) of A/V-IN-
TERMINAL (J1201),
and is Cb/C/r signal
sent to pins (4) and
(6) of A/V-IN-
TERMINAL (J1201)?
NO
Check external
connection, input
setting, A/V-IN-
TERMINAL
(J1201/1202) and
peripheral circuits.
Is Y/C signal sent
to pins (3) and (4)
of S-TERMINAL
(J1200)?
NO
Check external
connection, input
setting, S-
TERMINAL
(J1200) and
peripheral circuits.
NO
Is the composite
video signal (IN3-
V) sent to input
terminal pin (3) of
IC1203 (V-
SELECTOR)?
Check A/V-IN-
TERMINAL
(J1202) and
peripheral circuits.
Is component signal
(IN3-Y/Cb/Cr) sent to
input terminal pins
(33), (35) and (37) of
IC1203 (V-
SELECTOR)?
NO
Check A/V-IN-
TERMINAL
(J1201/1202) and
peripheral circuits.
Is Y/C signal (IN3-
Y/C) sent to input
terminal pins (5)
and (7) of IC1203
(V-SELECTOR)?
NO
Check S-
TERMINAL
(J1200) and
peripheral circuits.
YES
YES
YES
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.
Are component signals
(Y, Cb and Cr) sent
from output terminal
pins (60), (59) and (58)
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.
Are component
signals (Y, Cb and
Cr) sent to input
terminal pins (246),
(232) and (225) of
IC3300 (V-
PROCESSOR)?
NO
Check IC3300 (V-
PROCESSOR),
Q3700 Ð Q3705
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
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.
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
43
TROUBLE SHOOTING TABLE
(Continued)
EXT4 (HDMI) 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 "EXT4".
2) Have you checked the type of video signal sent from HDMI-connected external device?áááConfirm the type (it should be "RGB", "YCbCr 4:4:4" or
"YCbCr 4:2:2").
3) Is ANT-cable disconnected, or incorrectly connected?áááConnect it correctly as per the operation manual.
NO
YES
Check IC1904 (HDMI-
RECEIVER) and peripheral
circuits.
Is digital signal sent to pins (59)
and (58) Ð (71) and (70) of
IC1904 (HDMI-RECEIVER)?
YES
NO
NO
YES
Check the connection
between HDMI-
CONNECTOR (SC1900) and
pins (59) and (58) Ð (71) and
(70) of IC1904 and peripheral
circuits.
Is digital signal sent to pins (16)
and (15) Ð (3) and (1) of HDMI-
CONNECTOR SC1900?
Check the soldering of pins
(16) and (15) Ð (3) and (1) of
HDMI-CONNECTOR
SC1900, and check that
HOTP-CONT signal is sent
from microcomputer
(IC2001).
NO
Is the type of video signal
(Signal Type) from HDMI-
connected external device
set?
From MENU-Option-HDMI
Setup-Signal Type, select a
signal type ("RGB", "YCbCr
4:4:4" or "YCbCr 4:2:2").
NO
Is "EXT4" selected with
button on the remote control?
Select "EXT4" with
button on the remote control.
YES
YES
YES
Are Y, Pr and Pb signals sent
to pins (39), (41) and (43) of
IC1203 (V-SELECTOR)?
NO
NO
YES
Are Y, Cb and Cr signals sent
from pins (60), (59) and (58)
of IC1203 (V-SELECTOR)?
Check IC1203 and
peripheral circuits.
NO
YES
YES
Are Y, Cb and Cr signals sent
to pins (246), (232) and (225)
of IC3300 (V-PROCESSOR)?
Check output of IC1203,
Q3700 Ð Q3705 and
peripheral circuits.
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.
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
NO
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)?
Check IC4502 and peripheral
circuits.
YES
NO
Is digital RGB signal sent to pins (14) and (21) - (42) and (49) of LCD-CONNECTOR SC4651/4652?
YES
Check the LCD panel.
Check IC4502, LCD-
CONNECTOR,
SC4651/4652 and peripheral
circuits.
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
44
TROUBLE SHOOTING TABLE
(Continued)
NO
No picture and no sound
NO
NO
YES
! "#
YES
YES
$#
%
NO
&
YES
$#
%
%
NO
YES
YES
"#
'
%
! "#
YES
()*
+
LED flashing timing chart
!,
- . -
/.
. '
0
-
/.
. '
0
%
- &
/.
. '
1+ ,2
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
45
TROUBLE SHOOTING TABLE
(Continued)
NO
The backlight does not light.
Do all fluorescent lamps fail to light?
Check the fluorescent lamps that do not
light.
YES
Replace the fluorescent lamps that do not
light.
Replace the blown fuse(F703) or R1765
and turn on the power. If the backlight still
fails to light, check the area that has
shorted out.
YES
YES
Mainly check T7501, T7502 and their
peripheral circuits as well as Z7501and its
peripherals.
In POWER UNIT:
Check the fuse of the circuit for
INVERTER-UNIT.
Has the F703 2.0A in the POWER-UNIT
blown? Is the value for R1765 1½ correct?
YES
In the POWER-UNIT: Is approximately 380
VDC output to CN702? Check that the
RC701operates properly.
YES
NO
Check the connections of INV-PN7501and
POWER-CN702.
In the INVERTER-UNIT: Is the power
supplied between pins 1and 2 of
CONNECTOR-PN7501? (Pins 1 and 2 on
the measuring point PN7501; 380 VDC)
NO
Is each control signal sent to
CONNECTOR-CN1704 and CN1703 in
the POWER UNIT? (VCC 2(14V), OFL1,
INVáOSC)
NO
NO
Check the OFL1and INVáOSC-LINE of
CONNECTOR-P4101 in the MAIN-UNIT
and UR14V-LINE in the POWER-UNIT.
In the INVERTER-UNIT: Is each control
signal sent to PN7503? (VCC 2(14V)_
1Pin , OFL1_6Pin, INV-OSC_3Pin
RETURN_2Pin)
YES
YES
Replace the Z2501(INV-CTL)(STR-
H2013).
NO
In the INVERTER-UNIT: Is the control
signal of Z2501(INV-CTL)(STR-H2013)
output correctly? (PDRV1/V2(22)(20)Pin)
Check the photocoupler (PC 7501-22) and
the output transformer (T7503-25). Also
check the lamp connector connection.
YES
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