No Video (Tuner Dtv) - Samsung UN40C6300SF Service Manual

4-2-5. No Video (Tuner DTV)

※ Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
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
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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6
Diagnostics
5
Caution Make sure to disconnect the power before working on the IP board.
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 IC901 ?
R904 : CH_CLK
R905 : CH_VALID
Yes
Check the LVDS clk signal
at output of Main board.(TX1~TX4)
TX1_CLK : TP1978 ~1979
TX2_CLK : TP1980 ~1981
TX3_CLK : TP19102 ~19103
TX4_CLK : TP19104 ~19105
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 Tuner and IC901(Arsenal).
Change the Main Assy.
Check IC1101(Valencia) and
No
IC1701(Reading).
Change the Main Assy.
No
Please, Contact Tech support.
4. Troubleshooting
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