LC-37GA9EK (serv.man8). Troubleshooting Tables - Sharp TV Service Manual (repair manual). Page 8

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39
 LC-26GA5E
 LC-32GA5E
  LC-32GA9E/LC-32BV9E
  LC-37GA9E/LC-37BV9E
Troubleshooting Table (continued)
35
LC-32/37GA9E
LC-32/37BV9E
TROUBLESHOOTING TABLE
 (Continued)
<When EXT2 is used for external input>
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.
No EXT2-RGB output of the external input 
system.
No EXT2-Y/C output of the external input 
system.
NO
Is composite video 
signal sent to pin 
(41) of SCART2 
(J1101)?
Check external 
connection, input 
setting, SCART2 
(J1101) and 
peripheral circuits.
Is RGB signal sent 
to pins (36), (32) 
and (28) of 
SCART2 (J1101)?
NO
Check external 
connection, input 
setting, SCART2 
(J1101) and 
peripheral circuits.
Is Y/C signal sent 
to pins (41) and 
(36) of SCART2 
(J1101)?
NO
Check external 
connection, input 
setting, SCART2 
(J1101) and 
peripheral circuits.
YES
YES
YES
NO
Is composite video 
signal (VIN_2) 
sent to input 
terminal pin (4) of 
IC2702 (SW)?
Check 
CONNECTOR 
(SC2702/P1101),
SCART2 (J1101) 
and peripheral 
circuits.
Is RGB signal 
(R2/G2/B2=VIN_1
5/16/17) sent to 
input terminal pins 
(178), (177) and 
(176) of IC3002 
(VCT)?
NO
Check 
CONNECTOR 
(SC2702/P1101),
SCART1 (J1101) 
and peripheral 
circuits.
Is Y/C signal 
(VIN1=Y2/C2) sent 
to input terminal 
pins (190) and 
(178) of IC3002 
(VCT)?
NO
Check 
CONNECTOR 
(SC2702/P1101),
SCART2 (J1101) 
and peripheral 
circuits.
YES
NO
Is composite video 
signal
(CVBS2=VIN2)
sent to input 
terminal pin (190) 
of IC3002 (VCT)?
Check IC2702 
(SW) and 
peripheral circuits.
YES
NO
YES
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)?
Check pins (192), (170) and (133) of BU3.3V 
power line and pins (185), (169) and (142) of 
1.8V power line of IC3002 (VCTP), and 
peripheral circuits.
YES
YES
Replace LCD-CONT-UNIT.
YES
NO
NO
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?
Is LCD5V supplied to pins (31) – (28) of 
CONNECTOR (P2305)?
Check Harness Wire (LV).
No picture on the display (4)
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