Samsung UA40C6200UF Service Manual page 74

4. Troubleshooting
4-1-5. No Video (Tuner DTV)
Symptom Audio is normal but no picture is displayed on the screen.
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Check the DTV source.
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Major
Check the Tuner, Check the Valencia.
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checkpoints
Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
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6
Diagnostics
2
Caution Make sure to disconnect the power before working on the IP board.
4-16
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the connection of RF cable ?
Yes
Check the 'signal strength' in Self Diagnosis
menu Strength is enough ?
Yes
Check the Power of Tuner ?
Pin #5 of Tuner : B33V_Tuner
Pin #3 of Tuner : B5V_Tuner
Yes
Check the CH output of IC6001?
R6003 : CH_CLK
R6004 : CH_VALID
Yes
Check the LVDS clk signal at output of
Main board ? (TX1~TX4)
TX2_BP, TX2_CN, TX2_CP, TX2_CLKN
TX4_BP, TX4_CN, TX2_CP, TX2_CLKN
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
No
Check a set in the 'Stand-by mode'.
No
Input the RF source properly.
No
Check the D-TV source.
No
Change the Main Assy.
No
Check IC6001.
Change the Main Assy.
Check IC7001.
No
Change the Main Assy.
No
Please, Contact Tech support.