Sharp LC-32SA1E (serv.man2) Service Manual ▷ View online
LC-26SA1E/RU, LC-32SA1E/RU
6 – 19
<When EXT3 is used for external input> No picture on the display (5)
No EXT3-Y/C 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 “EXT3”.
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS set to “MIN”?
••• Set it to an appropriate level.
3) Check the connection to the external device
••• Connect it correctly as per the operation manual for the device.
Is Y/C signal sent to pins (11) and (7) of S-TERMINAL (J1201)?
NO
Check external connection, input setting, S-TERMINAL (J1201)
and peripheral circuits.
and peripheral circuits.
YES
Is Y3 signal (IN3-Y) sent to Input terminal pin (6) of IC1201
(SW)?
(SW)?
NO
Check S-TERMINAL (J1201) and peripheral circuits.
YES
Is Y/C signal (VIN7/VIN8) sent to input terminal pins (184) and
(183) of IC3002 (VCT)?
(183) of IC3002 (VCT)?
NO
Check CONNECTOR (SC2703/P1102), IC3002 (VCT) 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)?
(140) - (129) and (128) of IC3002 (VCTP), and is 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.
(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)?
(24) and (25) of CONNECTOR CN1 in LCD-CONT-UNIT, and is
CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
NO
Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).
YES
Is power (LCD5V) supplied to pins (2) - (5) of CONNECTOR CN1
in LCD-CONT-UNIT?
in LCD-CONT-UNIT?
NO
Is LCD5V supplied to pin (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).
Check HARNESS WIRE (LV).
YES
Replace LCD-CONT-UNIT.
LC-26SA1E/RU, LC-32SA1E/RU
6 – 20
<When EXT4 is used for external input> No picture on the display (6)
No EXT4 (15pin-D-SUB terminal) output of the external input
system.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
••• See the operation manual 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 commer-
cially 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.
YES
Is “EXT4” selected with “INPUT SOURCE” button
on the
remote control?
NO
Select “EXT4” with “INPUT SOURCE” button
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)?
and (3) of EXT4-TERMINAL (SC2303)?
NO
Check D-SUB-adaptor and external connection.
YES
Is D-SUB-COMPONENT signal (PCV_R/G/B=VIN19/20/21) sent
to pins (174), (173) and (172) of IC3002 (VCT)?
to pins (174), (173) and (172) of IC3002 (VCT)?
NO
Check EXT4-TERMINAL 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)?
(140) - (129) and (128) of IC3002 (VCTP), and is 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.
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)?
(24) and (25) of CONNECTOR CN1 in LCD-CONT-UNIT, and is
CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
NO
Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).
YES
Is power (LCD5V) supplied to pins (2) - (5) of CONNECTOR CN1
in LCD-CONT-UNIT?
in LCD-CONT-UNIT?
NO
Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).
Check HARNESS WIRE (LV).
YES
Replace LCD-CONT-UNIT.
LC-26SA1E/RU, LC-32SA1E/RU
6 – 21
<When EXT5 is used for external input> No picture on the display (7)
No EXT5 (HDMI) 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 “EXT5”.
2) Have you checked the type video signal sent from HDMI-connected external device?
••• Confirm the type (it should “RGB”, “YCbCr 4:4:4” or
“YCbCr 4:2:2”).
3) Have you checked the type of Color 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.
YES
Is “EXT5” selected with “INPUT SOURCE” button
on the
remote control?
NO
Select “EXT5” with “INPUT SOURCE” button
on the remote
control.
YES
Is the type of video signal (Signal Type) from HDMI-connected
external device set?
external device set?
NO
From MENU-Option-HDMI Setup-Signal Type, select a signal
type (“RGB”, “YCbCr 4:4:4” or “YCbCr 4:2:2”).
type (“RGB”, “YCbCr 4:4:4” or “YCbCr 4:2:2”).
YES
Is the type of color signal (Color Matrix) from HDMI-connected
external device set?
external device set?
NO
From Option-HDMI Setup-Color Matrix, select a color signal type
(“AUTO”, “ITU601” or “ITU709”)
(“AUTO”, “ITU601” or “ITU709”)
YES
Is TMDS data (RX*
±signal) sent to pins (1) - (12) of EXT5 (HDMI)
terminal (SC1901)?
NO
Is I2C signal (SDA/SCL signal) sent to pins (16) and (15) of
EXT5 (HDMI) terminal?
Check external connection and peripheral circuits.
EXT5 (HDMI) terminal?
Check external connection and peripheral circuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent from pins (110) - (144)
of IC1905 (HDMI-RECEIVER)?
of IC1905 (HDMI-RECEIVER)?
NO
Check power supply (3.3/1.8V) pins (99) and (74) of IC1905,
SDA/SCL signal pins (29) and (30), and peripheral circuits.
SDA/SCL signal pins (29) and (30), and peripheral circuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent to pins (73) - (50) of
IC3002 (VCT)?
IC3002 (VCT)?
NO
Check SDA3/SCL3 signal pins (27) and (28), interface between
IC1905 and lC3002, and peripheral circuits.
IC1905 and lC3002, 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)?
(140) - (129) and (128) of IC3002 (VCTP), and is 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.
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)?
(24) and (25) of CONNECTOR CN1 in LCD-CONT-UNIT, and is
CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
NO
Check CONNECTOR (P2305,CN1) and HARNESS WIRE (LV).
YES
Is power (LCD5V) supplied to pins (2) - (5) of CONNECTOR CN1
in LCD-CONT-UNIT?
in LCD-CONT-UNIT?
NO
Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).
Check HARNESS WIRE (LV).
YES
Replace LCD-CONT-UNIT.
LC-26SA1E/RU, LC-32SA1E/RU
6 – 22
<26/32”> Backlight failure to light up
Do all the fluorescent tubes light up?
NO
Check the individual fluorescent
tubes for light-up failure
tubes for light-up failure
YES
Replace any defective fluorescent
tube (s) with new one (s).
tube (s) with new one (s).
YES
Is the power supplied to the inverter
unit?
unit?
NO
Check the connection between
power unit and inverter unit.
power unit and inverter unit.
YES
Is the fuse in the inverter unit circuit
functioning?
functioning?
NO
Replace the blown-out fuse on the
inverter unit.
Turn on the power again.
If the fuse gets blown out again,
check the short-circuited
inverter unit.
Turn on the power again.
If the fuse gets blown out again,
check the short-circuited
YES
Check drive trans and their peripheral
circuits as well as drive FET and their
peripheral circuits.
circuits as well as drive FET and their
peripheral circuits.
YES
Is the VCC power supplied to the
inverter control IC on the inverter
unit?
inverter control IC on the inverter
unit?
NO
Check the circuit connected with the
VCC terminal on the inverter control
IC.
VCC terminal on the inverter control
IC.
YES
Are there control signals (INV-ON,
INV-BRT, PWM-SEL) at CN3 on the
inverter unit?
INV-BRT, PWM-SEL) at CN3 on the
inverter unit?
NO
Are there the INV-ON and INV-BRT
signals at P704 on the power unit,
and the (INV-ON and INV-BRT)
signals at SC1702 on the main PWB?
signals at P704 on the power unit,
and the (INV-ON and INV-BRT)
signals at SC1702 on the main PWB?
NO
Check pins (97) and (91) of IC1710
(main PWB).
(main PWB).
YES
Is the specified control signal inputted
at INV-CTL-IC on the inverter unit?
at INV-CTL-IC on the inverter unit?
NO
Check the line between CN3 and
INV-CTL-IC.
INV-CTL-IC.
YES
Are the DRIVE-FET at the primary
side of DRIVE-TRANS functioning?
side of DRIVE-TRANS functioning?
NO
Replace INV-CTL-IC or check its
peripheral circuits.
peripheral circuits.
YES
Is the secondary circuit of DRIVE-
TRANS functioning?
TRANS functioning?
NO
Replace the DRIVE-TRANS for
the fluorescent tubes, or check their
peripheral circuits.
the fluorescent tubes, or check their
peripheral circuits.
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