No Video (Tuner_Cvbs) - Samsung UN40HU6950F 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 • Audio is normal but no picture is displayed on the screen.
• Check the Tuner CVBS source.
Major • Check the Tuner.
checkpoints
• This may happen when the LVDS cable connecting the Main Board and the Panel is
disconnected.
1
Diagnostics
2
2
Caution Make sure to disconnect the power before working on the IP Board.
4-10
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 #1 of Tuner : A3.3V_Tuner
-
Pin #4 of Tuner : A1.8V_Tuner
-
Yes
Check the CVBS data out of IC1400 ?
L903 : Tuner CVBS_OUT
-
CVBS_OUT_TP : IC1400 CVBS_
-
OUT
Yes
Check the LVDS clk signal at output of
Main board. (TX)
TX6_CLK : TCON SDA
-
TX8_DATA : TCON SCL
-
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 Change the Main Ass'y.
Check IC1400(NT14U).
No
Change the Main Ass'y.
Check IC1400(NT14U).
No
Change the Main Ass'y.
No Please, Contact tech support.