Sharp LC-37GD9EK (serv.man10) Service Manual ▷ View online
53
LC-26GA5E
LC-32GA5E
LC-32GD9E
LC-37GD9E
Troubleshooting Table (continued)
37
LC-32/37GD8E/RU
LC-32/37BT8E/RU
TROUBLESHOOTING TABLE
(Continued)
NO
NO
NO
YES
YES
Is "EXT4" selected with
button on the remote control?
button on the remote control?
Select "EXT4" with button
on the remote control.
on the remote control.
YES
Is D-SUB-COMPONENT signal
(PCV_R/G/B) sent to pins (1),
(2) and (3) of EXT4-TERMINAL
(SC2303)?
(PCV_R/G/B) sent to pins (1),
(2) and (3) of EXT4-TERMINAL
(SC2303)?
Check D-SUB-adaptor and
external connection.
external connection.
Is D-SUB-COMPONENT signal
(PCV_R/G/B=VIN19/20/21))
sent to pins (174), (173) and
(172) of IC3002 (VCT)?
(PCV_R/G/B=VIN19/20/21))
sent to pins (174), (173) and
(172) of IC3002 (VCT)?
Check EXT4-TERMINAL and
peripheral circuits.
peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent from pins (141) and (140) - (129) and (128) of IC3002 (VCTP), and is
CLK signal (LVDS_CN/CP) sent from pins (132) and (131)?
CLK signal (LVDS_CN/CP) sent from pins (132) and (131)?
NO
Check pins (192), (170) and
(133) of BU3.3V power line and
pins (185), (169) and (142) of
BU1.8V power line of IC3002
(VCTP), and peripheral circuits.
(133) of BU3.3V power line and
pins (185), (169) and (142) of
BU1.8V power line of IC3002
(VCTP), and peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (12) and (13) - (24) and (25) of CONNECTOR CN1 in LCD-
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
NO
Check CONNECTOR (P2305,
CN1) and Hareness Wire (LV).
CN1) and Hareness Wire (LV).
YES
Is power (LCD5V) supplied to pins (2) – (5) of CONNECTOR CN1 in LCD-CONT-UNIT?
NO
Replace LCD-CONT-UNIT.
<When EXT4 is used for external input>
No EXT4 (15pin-D-SUB-terminal)
output of the external input system.
output of the external input system.
Checklist:
1) Is "INPUT SOURCE" button on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT4".
2) Connect the included D-SUB-Adapter-Cable to the COMPONENT terminal of an external device. ··· See the operation manual (use a commercially
available Component-Cable to connect to the external device).
3) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
1) Is "INPUT SOURCE" button on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT4".
2) Connect the included D-SUB-Adapter-Cable to the COMPONENT terminal of an external device. ··· See the operation manual (use a commercially
available Component-Cable to connect to the external device).
3) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
No picture on the display (6)
YES
Check HARNESSWIRE (LV).
Is IC 1705 supplying LCD 5V?
NO
YES
Check IC1705 and peripheral parts.
YES
NO
Change IC1705.
Is LCD5V supplied to pins (31) -
(28) of CONNECTOR (P2305)?
54
LC-26GA5E
LC-32GA5E
LC-32GD9E
LC-37GD9E
Troubleshooting Table (continued)
38
LC-32/37GD8E/RU
LC-32/37BT8E/RU
TROUBLESHOOTING TABLE
(Continued)
NO
NO
NO
YES
YES
Is "EXT5" selected with
button on the remote control?
button on the remote control?
Select "EXT5" with button
on the remote control.
on the remote control.
YES
Is the type of video signal
(Signal Type) from HDMI-
connected external device set?
(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").
Setup-Signal Type, select a
signal type ("RGB", "YCbCr
4:4:4" or "YCbCr 4:2:2").
Is the type of colour signal
(Colour Matrix) from HDMI-
connected external device set?
(Colour Matrix) from HDMI-
connected external device set?
From Option-HDMI Setup-
Colour Matrix, select a color
signal type ("AUTO", "ITU601"
or "ITU709").
Colour Matrix, select a color
signal type ("AUTO", "ITU601"
or "ITU709").
NO
NO
YES
YES
Is TMDS data (RX`
± signal)
sent to pins (1) – (12) of EXT5
(HDMI) terminal (SC1901)?
(HDMI) terminal (SC1901)?
Is I2C signal (SDA/SCL signal)
sent to pins (16) and (15) of
EXT5 (HDMI) terminal? Check
external connection and
peripheral circuits.
sent to pins (16) and (15) of
EXT5 (HDMI) terminal? Check
external connection and
peripheral circuits.
Is 8bit-DIGITAL signal (HDMI-
R/G/B) sent from pins (110) –
(144) of IC1905 (HDMI-
RECEIVER)?
R/G/B) sent from pins (110) –
(144) of IC1905 (HDMI-
RECEIVER)?
Check power supply (3.3/1.8V)
pins (99) and (74) of IC1905,
SDA/SCL signal pins (29) and
(30), and peripheral circuits.
pins (99) and (74) of IC1905,
SDA/SCL signal pins (29) and
(30), and peripheral circuits.
NO
YES
Is 8bit-DIGITAL signal (HDMI-
R/G/B) sent to pins (73) – (50) of
IC3002 (VCT)?
R/G/B) sent to pins (73) – (50) of
IC3002 (VCT)?
Check SDA3/SCL3 signal pins
(27) and (28), interface between
IC1905 and IC3002, and
peripheral circuits.
(27) and (28), interface between
IC1905 and IC3002, and
peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent from pins (141) and (140) - (129) and (128) of IC3002 (VCTP), and is
CLK signal (LVDS_CN/CP) sent from pins (132) and (131)?
CLK signal (LVDS_CN/CP) sent from pins (132) and (131)?
NO
Check pins (192), (170) and
(133) of BU3.3V power line and
pins (185), (169) and (142) of
BU1.8V power line of IC3002
(VCTP), and peripheral circuits.
(133) of BU3.3V power line and
pins (185), (169) and (142) of
BU1.8V power line of IC3002
(VCTP), and peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (12) and (13) - (24) and (25) of CONNECTOR CN1 in LCD-
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
NO
Check CONNECTOR (P2305,
CN1) and Hareness Wire (LV).
CN1) and Hareness Wire (LV).
Is power (LCD5V) supplied to pins (2) – (5) of CONNECTOR CN1 in LCD-CONT-UNIT?
NO
Replace LCD-CONT-UNIT.
<When EXT5 is used for external input>
No EXT5 (HDMI) output of the
external input system.
external input system.
Checklist:
1) Is "INPUT SOURCE" button on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT5".
2) Have you checked the type of video signal sent from HDMI-connected external device? ··· Confirm the type (it should be "RGB", "YCbCr 4:4:4" or
"YCbCr 4:2:2").
3) Have you checked the type of Colour Matrix sent from HDMI-connected external device? ··· Confirm the type (it should be “ITU601’ or “ITU709”.)
4) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
1) Is "INPUT SOURCE" button on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT5".
2) Have you checked the type of video signal sent from HDMI-connected external device? ··· Confirm the type (it should be "RGB", "YCbCr 4:4:4" or
"YCbCr 4:2:2").
3) Have you checked the type of Colour Matrix sent from HDMI-connected external device? ··· Confirm the type (it should be “ITU601’ or “ITU709”.)
4) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
No picture on the display (7)
YES
YES
Check HARNESSWIRE (LV).
Is IC 1705 supplying LCD 5V?
NO
YES
Check IC1705 and peripheral parts.
YES
NO
Change IC1705.
Is LCD5V supplied to pins (31) -
(28) of CONNECTOR (P2305)?
55
LC-26GA5E
LC-32GA5E
LC-32GD9E
LC-37GD9E
40
LC-32GD9E
LC-37GD9E
TROUBLESHOOTING TABLE
(Continued)
NO
NO
NO
YES
YES
Is "EXT6" selected with
button on the remote control?
button on the remote control?
Select "EXT6" with button
on the remote control.
on the remote control.
YES
Is the type of video signal
(Signal Type) from HDMI-
connected external device set?
(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").
Setup-Signal Type, select a
signal type ("RGB", "YCbCr
4:4:4" or "YCbCr 4:2:2").
Is the type of colour signal
(Colour Matrix) from HDMI-
connected external device set?
(Colour Matrix) from HDMI-
connected external device set?
From Option-HDMI Setup-
Colour Matrix, select a color
signal type ("AUTO", "ITU601"
or "ITU709").
Colour Matrix, select a color
signal type ("AUTO", "ITU601"
or "ITU709").
NO
NO
YES
YES
Is digital signal (RX`
± signal)
sent to pins (1) – (12) of EXT6
(HDMI) terminal (SC1902)?
(HDMI) terminal (SC1902)?
Is I2C signal (SDA/SCL signal)
sent to pins (16) and (15) of
EXT6 (HDMI) terminal? Check
external connection and
peripheral circuits.
sent to pins (16) and (15) of
EXT6 (HDMI) terminal? Check
external connection and
peripheral circuits.
Is 8bit-DIGITAL signal (HDMI-
R/G/B) sent from pins (110) –
(144) of IC1905 (HDMI-
RECEIVER)?
R/G/B) sent from pins (110) –
(144) of IC1905 (HDMI-
RECEIVER)?
Check power supply (3.3/1.8V)
pins (99) and (74) of IC1905,
SDA/SCL signal pins (99) and
(74), and peripheral circuits.
pins (99) and (74) of IC1905,
SDA/SCL signal pins (99) and
(74), and peripheral circuits.
NO
YES
Is 8bit-DIGITAL signal (HDMI-
R/G/B) sent to pins (73) – (50) of
IC3002 (VCT)?
R/G/B) sent to pins (73) – (50) of
IC3002 (VCT)?
Check SDA3/SCL3 signal pins
(27) and (28), interface between
IC1905 and IC3002, and
peripheral circuits.
(27) and (28), interface between
IC1905 and IC3002, and
peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent from pins (141) and (140) - (129) and (128) of IC3002 (VCTP), and is
CLK signal (LVDS_CN/CP) sent from pins (132) and (131)?
CLK signal (LVDS_CN/CP) sent from pins (132) and (131)?
NO
Check pins (192), (170) and
(133) of BU3.3V power line and
pins (185), (169) and (142) of
BU1.8V power line of IC3002
(VCTP), and peripheral circuits.
(133) of BU3.3V power line and
pins (185), (169) and (142) of
BU1.8V power line of IC3002
(VCTP), and peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (12) and (13) - (24) and (25) of CONNECTOR CN1 in LCD-
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
NO
Check CONNECTOR (P2305,
CN1) and Hareness Wire (LV).
CN1) and Hareness Wire (LV).
YES
Is power (LCD5V) supplied to pins (2) – (5) of CONNECTOR CN1 in LCD-CONT-UNIT?
NO
Is LCD5V supplied to pins (31)
– (28) of CONNECTOR
(P2305)?
Check Hareness Wire (LV).
– (28) of CONNECTOR
(P2305)?
Check Hareness Wire (LV).
YES
Replace LCD-CONT-UNIT.
<When EXT6 is used for external input>
No EXT6 (HDMI) output of the
external input system.
external input system.
Checklist:
1) Is "INPUT SOURCE" button on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT6".
2) Have you checked the type of video signal sent from HDMI-connected external device? ··· Confirm the type (it should be "RGB", "YCbCr 4:4:4" or
"YCbCr 4:2:2").
3) Have you checked the type of Colour Matrix sent from HDMI-connected external device? ··· Confirm the type (it should be “ITU601’ or “ITU709”.)
4) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
1) Is "INPUT SOURCE" button on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT6".
2) Have you checked the type of video signal sent from HDMI-connected external device? ··· Confirm the type (it should be "RGB", "YCbCr 4:4:4" or
"YCbCr 4:2:2").
3) Have you checked the type of Colour Matrix sent from HDMI-connected external device? ··· Confirm the type (it should be “ITU601’ or “ITU709”.)
4) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
No picture on the display (8)
Troubleshooting Table (continued)
56
LC-26GA5E
LC-32GA5E
LC-32GD9E
LC-37GD9E
42
LC-32GD9E
LC-37GD9E
TROUBLESHOOTING TABLE
(Continued)
NO
YES
YES
Do all the fluorescent tubes light up?
Check the individual fluorescent
tubes for light-up failure.
tubes for light-up failure.
NO
Is the specified control signal
inputted at IC7501 (INV-CTL) on the
inverter unit?
inputted at IC7501 (INV-CTL) on the
inverter unit?
Check the line between CN7502 and
IC7501.
IC7501.
NO
Are the Q7501 and Q7502
transistors at the primary side of
T7501 functioning?
transistors at the primary side of
T7501 functioning?
Replace IC7501 (INV-CTL) or check
its peripheral circuits.
its peripheral circuits.
NO
Is the secondary circuit of T7501
functioning?
functioning?
Replace T7501 or the T75**
transformer for the fluorescent tubes,
or check their peripheral circuits.
transformer for the fluorescent tubes,
or check their peripheral circuits.
Replace any defective fluorescent
tube (s) with new one (s).
tube (s) with new one (s).
NO
YES
Replace the blown-out F7501 fuse on
the inverter unit. Turn on the power
again. If the fuse gets blown out
again, check the short-circuited spot.
the inverter unit. Turn on the power
again. If the fuse gets blown out
again, check the short-circuited spot.
Check T7501 and T7502 and their
peripheral circuits as well as IC7501
and Z7601 and their peripheral
circuits.
peripheral circuits as well as IC7501
and Z7601 and their peripheral
circuits.
NO
YES
YES
Is the power supplied to CN7501 on
the inverter unit?
the inverter unit?
Is the F7501 fuse in the inverter unit
circuit functioning?
circuit functioning?
Check the connection between
power unit and inverter unit.
power unit and inverter unit.
NO
NO
Are there the INV-ON/OFF and INV-
BRT signals at P704 on the power
unit, and the INV-OFL and INV-OSC
signals at P1701 on the main PWB?
BRT signals at P704 on the power
unit, and the INV-OFL and INV-OSC
signals at P1701 on the main PWB?
Check pins (18), (27) and (28) of
IC1710 (main PWB) and pin (16) of
IC3003.
IC1710 (main PWB) and pin (16) of
IC3003.
YES
YES
YES
YES
Are there control signals (INV-OFL,
INV-OSC, INV-ON/OFF, INV-BRT) at
CN7501 and CN7502 on the inverter
unit?
INV-OSC, INV-ON/OFF, INV-BRT) at
CN7501 and CN7502 on the inverter
unit?
NO
Check the circuit connected with the
VCC terminal on the inverter control
IC (IC7501).
VCC terminal on the inverter control
IC (IC7501).
Is the VCC power supplied to the
inverter control IC (IC7501) on the
inverter unit?
inverter control IC (IC7501) on the
inverter unit?
Backlight failure to light up
41
LC-32GD9E
LC-37GD9E
TROUBLESHOOTING TABLE
(Continued)
Note: The SD signal (576i and 480i) alone passes through the FRC circuit. (The HD signal does not go through.)
Does the image appear with the HD signal,
but not with the SD signal?
but not with the SD signal?
Does anything unusual (whitish or blackish
screen, block noise, for example) appear
on the screen?
screen, block noise, for example) appear
on the screen?
Does the image look unusual with the
power switch turned on?
power switch turned on?
YES
YES
YES
YES
YES
Is the power supplied to IC3301 (FRC)?
Is there the FRC-IN signal input at pins
(142) and (13) of IC3301? Check the
soldering condition.
Is there the FRC-IN signal input at pins
(142) and (13) of IC3301? Check the
soldering condition.
Is there the specified RESET signal input
at pin (39) of IC3301 (FRC)? (60 ms delay
design)
at pin (39) of IC3301 (FRC)? (60 ms delay
design)
Replace IC3301 (FRC).
Check IC3302 (RESET).
Check the connection between pin (208) of
IC3002 (VCTP) and pin (13) of IC3301
(FRC) as well as that between pin (4) of
IC3302 and pin (6) of IC3301.
IC3002 (VCTP) and pin (13) of IC3301
(FRC) as well as that between pin (4) of
IC3302 and pin (6) of IC3301.
FRC circuit failure
Troubleshooting Table (continued)
Click on the first or last page to see other LC-37GD9EK (serv.man10) service manuals if exist.