No Video (Tuner_Cvbs) - Samsung UE40F6320AW Service Manual

4. Troubleshooting

4-2-3. No Video (Tuner_CVBS)

Note
Refer to the next page to check the location such a CN201 or IC201 SVC Manual mentioned.
Symptom
Major
checkpoints
Diagnostics
Caution
4-10
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• Audio is normal but no picture is displayed on the screen.
• Check the Tuner CVBS source.
• Check the Tuner.
• This may happen when the LVDS cable connecting the Main Board and the Panel is
disconnected.
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and check the
connection of RF cable.
Yes
Check the Power of Tuner ?
Pin #4 of Tuner : B3.3V_Tuner
-
1
Pin #1 of Tuner : B1.8V_Tuner
-
Yes
Check the CVBS data out of IC1001 ?
2
C807 : Tuner CVBS
Yes
Check the LVDS clk signal at output of
Main board. (TX)
2
TX2_CLK : ODD_TXCLK_DN/DP
-
TX4_CLK : EVEN_TXCLK_DN/DP
-
Yes
Check the LVDS cable?
Replace the T CON / LCD panel?
Make sure to disconnect the power before working on the IP Board.
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No Check a set in the 'Stand-by mode'.
No Input the RF source properly.
Change the Main Ass'y.
No
Check IC1001(X12).
No
Change the Main Ass'y.
Check IC1001(X12).
No
Change the Main Ass'y.
No Please, Contact tech support.