Samsung LA32C630 Series, Service Manual

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4-12
4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Tuner CVBS source.
-
Check the Tuner, Check the Valencia.
-
Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
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Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check the LVDS cable?
Replace the T-con / LCD panel?
Yes
Yes
Yes
Yes
Yes
No
No
Check a set in the ‘Stand-by mode’.
Please, Contact Tech support.
Input the RF source properly.
Check the RF source and
check the connection of RF cable ?
No
Change the Main Assy
32” : BN94-02620B
40” : BN94-02620F
46” : BN94-02620G
55” : BN94-02620H
Check Tuner and IC901.
Change the Main Assy.
Check IC1101 and IC1701.
Change the Main Assy.
No
No
No
Check the Power of Tuner ?
Pin #5 of Tuner : B33V_Tuner
Pin #3 of Tuner : B5V_Tuner
Check the CVBS data out of IC901 ?
L1003 : CVBS data
Check the LVDS clk signal at output of
Main board ? (TX1~TX4)
TP1916 ~1919
TP1940 ~1942
7
5
Caution Make sure to disconnect the power before working on the IP board.