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    LC-32SD1EA/RUA, LC-32ST1EA/RUA

5 – 1

LC-32SD1EA

Service Manual

 

               

Are the power cord and harness in the unit properly connected?

NO

Connect the power cord and harness properly, and turn on the 
power.

YES

Is F701 normal?

NO

Are both ends of C704, C705 short-circuited when checking their 
resistance values?

YES

NO

YES

Replace F701.   

Is a voltage of BU5V applied to pin (20) of P701?
(Set the main power SW to OFF.) 

C704 

••• Check VA701, VA702 and D701.

C705 

••• Check IC704 and 705.

YES

               

NO

Is a voltage of approx.
8 - 15V to pin (4) of 
IC705?

NO

Check IC705, IC708, D725 and Q724.

YES

Check short circuit of 5V line (D737, 
C752, etc.). 

Is it a symptom that the relay clatters twice as soon as the main 
power SW is set to ON and the power is not supplied?

NO

YES

Does the same symptom appear even if R858 (2.7k) is 
removed and the power is supplied again?

NO

Check IC704, D728, D762 and D736. If there are no problems, 
check the resistance value between pins (1) and (6) of P704.
When the value is low (several 

Ω - several hundred Ω), 

disconnect P704. If the value is still low, the parts of 24V line are 
defective. When the resistance value is several k

Ω, check the 

inverter unit.

YES

Check Q724, D731, D734, IC707, D751, D753, D754, 
D741, D759 and D746.

Does a relay noise sound? (Once)

NO

Are PCON1 and 2 [pins (1) and (2) of P702] at Hi (3V or more)?

YES

YES

NO

Check peripheral circuits of D738, R828 and D735.

Check peripheral circuits of Q712, Q713, Q721, Q723 
and RY701.

There is a possibility that control by P-CON is not performed 
properly. Check whether the “PCON1” and “PCON2” signals are 
sent from pins (97) and (91) of IC1710 (FPGA) of MAIN-UNIT.

LC-32SD1EA/RUA, LC-32ST1EA/RUA

5 – 2

                       
Do all the fluorescent tubes light up?

NO

Check the individual fluorescent 
tubes for light-up failure

YES

Replace any defective fluorescent
tubes with new ones.

YES

Is the power supplied to the inverter 
unit?

NO

Check the connection between
power unit and inverter unit.

YES

Is the fuse in the inverter unit circuit 
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

YES

Check drive trans and their peripheral
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?

NO

Check the circuit connected with the
VCC terminal on the inverter control
IC.

YES

Are there control signals (INV-ON, 
OFL, OSC) at CN7502 on the
inverter unit?

NO

Check pins (5), (7) and (8) of IC1710
(main PWB).

YES

Is the specified control signal inputted 
at INV-CTL-IC on the inverter unit?

NO

Check the line between CN7502 and
INV-CTL-IC.

YES

Are the DRIVE-FET at the primary 
side of DRIVE-TRANS functioning?

NO

Replace INV-CTL-IC or check its
peripheral circuits.

YES

Is the secondary circuit of DRIVE-
TRANS functioning?

NO

Replace the DRIVE-TRANS for
the fluorescent tubes, or check their
peripheral circuits.

    LC-32SD1EA/RUA, LC-32ST1EA/RUA

5 – 3

                                            
No EXT2-Composite 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 “EXT2”.

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 composite video signal sent to pin (41) of SCART2 (J1101)?

NO

Check external connection, input setting, SCART2 (J1101) and
peripheral circuits. 

YES

Is composite video signal (VIN-2) sent to input terminal pin (4) of
IC2702 (SW)? 

NO

Check CONNECTOR (SC2703/P1102), SCART2 (J1101) and 
peripheral circuits.

YES

Is composite video signal (CVBS2=VIN2) sent to input terminal 
pin (190) of IC3002 (VCT)? 

NO

Check IC2702 (SW) and peripheral circuits.

YES

Is LVDS signal (LVDS_0N/0P-3N/3P) sent from pins (141) and 
(140) - (129) and (128) of IC3002 (VCT), and is CLK signal 
(LVDS_CN/CP) sent from pins (132) and (131)? 

NO

Check pins (192), (170) and (133) of BU 3.3V power line and 
pins (185), (169) and (142) of BU1.8V power line of IC3002 
(VCT), and peripheral circuits.

YES

Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (13) and (12) - 
(25) and (24) of CONNECTOR CN1 in LCD-CONT-UNIT, and is 
CLK signal (LVDS_CN/CP) sent to pins (22) and (21)? 

NO

Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).

YES

Is power (LCD5V) supplied to pins (1) - (4) of CONNECTOR CN1 
in LCD-CONT-UNIT?

NO

Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).

YES

Replace LCD-CONT-UNIT.

LC-32SD1EA/RUA, LC-32ST1EA/RUA

5 – 4

                                            
No EXT2-RGB 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 “EXT2”.

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 RGB signal sent to pins (36), (32) and (28) of SCART2 
(J1101)?

NO

Check external connection, input setting, SCART2 (J1101) and 
peripheral circuits. 

YES

Is RGB signal (R2/G2/B2=VIN_15/16/17) sent to Input terminal 
pins (178), (177) and (176) of IC3002 (VCT)? 

NO

Check CONNECTOR (SC2703/P1102), SCART2 (J1101) and 
peripheral circuits. 

YES

Is LVDS signal (LVDS_0N/0P-3N/3P) sent from pins (141) and 
(140) - (129) and (128) of IC3002 (VCT), and is CLK signal 
(LVDS_CN/CP) sent from pins (132) and (131)? 

NO

Check pins (192), (170) and (133) of BU 3.3V power line and 
pins (185), (169) and (142) of BU1.8V power line of IC3002 
(VCT), and peripheral circuits.

YES

Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (13) and (12) - 
(25) and (24) of CONNECTOR CN1 in LCD-CONT-UNIT, and is 
CLK signal (LVDS_CN/CP) sent to pins (22) and (21)? 

NO

Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).

YES

Is power (LCD5V) supplied to pins (1) - (4) of CONNECTOR CN1 
in LCD-CONT-UNIT?

NO

Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).

YES

Replace LCD-CONT-UNIT.