LC-32GD9EK (serv.man10). Troubleshooting Tables - Sharp TV Service Manual (repair manual). Page 6

Check power supply and pins (9) and (10)of IC2704(SW) and 
audio signal input of pins (4) and (11) of IC2704.

Check Q4601... Q4607 and their peripheral circuits.

Check R272 and R273.

Are scrambled images not displayed?

DIGITAL UNIT:
Is audio signal fed to pins (5) and (10) of IC4604 (OP-AMP)?

Are video signals (R/G/B,CVBS) send from the 
C4636/C4637/C4638 and emitters of Q4607?

Check power supply and pin (1) of IC2705(SW).

MAIN UNIT:
Is video signal (CVBS) sent from pin (2) of IC2705(SW).

Are video signals (R/G/B,CVBS) fed from pins (179),(180),(181) 
and (184) of IC3002?

MAIN UNIT:
Is audio signal sent to pin (3) and (13) of IC2704 (SW)?

Is audio signal sent from pins (7) and (8) of IC4604(OP-AMP)?

Check R4002(AD2pin) and IC4001(D-Processor).

Check power supply of IC4604(OP-AMP) and its peripheral circuits.

D-TUNER UNIT:
Is data FED[0:7] sent from pins (3),(4),(5),(6),(8),(9),(10) and (11) 
of P202?

DIGITAL UNIT:
Check 5V output of pin (1) of IC4702.
Check 5V of pin (6) of Q4401.

Check R4011(AC8pin),R4013(AC9pin) and IC4001(D-Processor).

DIGITAL UNIT:
Are video signals (R/G/B,CVBS) sent from 
C4639/C4640/C4641/C4625?

No EXT1-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 "EXT1".
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.

No EXT1-RGB output of the external input 
system.

No EXT1-Y/C output of the external input 
system.

Is composite video 
signal sent to pin 
(20) of SCART1 
(J1101)?

Check external 
connection, input 
setting, SCART1 
(J1101) and 
peripheral circuits.

Is RGB signal sent 
to pins (15), (11) 
and (7) of SCART1 
(J1101)?

Check external 
connection, input 
setting, SCART1 
(J1101) and 
peripheral circuits.

Is Y/C signal sent 
to pins (20) and 
(15) of SCART1 
(J1101)?

Check external 
connection, input 
setting, SCART1 
(J1101) and 
peripheral circuits.

Is composite video 
signal (VIN_1) 
sent to input 
terminal pin (6) of 
IC2702 (SW)?

Check 
CONNECTOR 
(SC2702/P1101),
SCART1 (J1101) 
and peripheral 
circuits.

Is RGB signal 
(R1/G1/B1=VIN_6/
5/9) sent to input 
terminal pins 
(187), (175) and 
(182) of IC3002 
(VCT)?

Check 
CONNECTOR 
(SC2702/P1101),
SCART1 (J1101) 
and peripheral 
circuits.

Is Y/C signal 
(VIN1=Y1/C1) sent 
to input terminal 
pins (190) and 
(187) of IC3002 
(VCT)?

Check 
CONNECTOR 
(SC2702/P1101),
SCART1 (J1101) 
and peripheral 
circuits.

Is composite video 
signal
(CVBS1=VIN2)
sent to input 
terminal pin (190) 
of IC3002 (VCT)?

Check IC2702 
(SW) and 
peripheral circuits.

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)?

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.

Replace LCD-CONT-UNIT.

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)?

Check CONNECTOR (P2305, CN1) and 
Harness Wire (LV).

Is power (LCD5V) supplied to pins (2) – (5) of CONNECTOR CN1 in LCD-CONT-UNIT?

 Check HARNESSWIRE (LV).

 Is IC1705 supplying LCD 5V?

 Check IC1705 and peripheral parts.

 Change IC1705.

 Is LCD5V supplied to pins (31) - (28) of 

 CONNECTOR (P2305)?