Sharp LC-32GA8 Service Manual page 39

LC-32/37GA8E/RU
LC-32/37BV8E/RU
Troubleshooting Table (continued)
TROUBLESHOOTING TABLE
<When EXT3 is used for external input>
No EXT3 output of the external
input system.
Checklist:
1) Is "INPUT SOURCE" button
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.
YES
Is composite video signal sent to
pin (1) of A/V-IN-TERMINAL
(J1201)?
YES
Is composite video signal (IN3-
CVBS) sent to input terminal pin
(4) of IC1201 (SW)?
YES
Is composite video signal
(CVBS=VIN7) sent to input
terminal pin (184) of IC3002
(VCT)?
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)?
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)?
YES
Is power (LCD5V) supplied to pins (2) – (5) of CONNECTOR CN1 in LCD-CONT-UNIT?
YES
No picture on the display (5)
on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT3".
NO
Check external connection,
input setting, A/V-IN-TERMINAL
(J1201) and peripheral circuits.
NO
Check A/V-IN-TERMINAL
(J1201) and peripheral circuits.
NO
Check CONNECTOR
(SC2703/P1102), IC3002 (VCT)
and peripheral circuits.
Replace LCD-CONT-UNIT.
(Continued)
No EXT3-Y/C output of the
external input system.
YES
Is Y/C signal sent to pins (11)
and (7) of S-TERMINAL
(J1201)?
YES
Is Y3 signal (IN3-Y) sent to input
terminal pin (6) of IC1201 (SW)?
YES
Is Y/C signal (VIN7/VIN8) sent to
input terminal pins (184) and
(183) of IC3002 (VCT)?
YES
34
39
LC-26GA5E
LC-32GA8/LC-32BV8
LC-32GA5E
LC-37GA8/LC-37BV8
NO
Check external connection,
input setting, S-TERMINAL
(J1201) and peripheral circuits.
NO
Check S-TERMINAL (J1201)
and peripheral circuits.
NO
Check CONNECTOR
(SC2703/P1102), IC3002 (VCT)
and peripheral circuits.
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.
NO
Check CONNECTOR (P2305,
CN1) and Harness Wire (LV).
NO
Is LCD5V supplied to pins (31)
– (28) of CONNECTOR
(P2305)?
Check Harness Wire (LV).