Samsung UN40HU6950F, Service Manual, Page: 35 / 81

4-2-4. No Video (Tuner DTV)
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. •
Major
checkpoints
Check the DTV source. •
Check the Tuner. •
This may happen when the LVDS cable connecting the Main Board and the Panel is •
disconnected.
Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
No Check a set in the ‘Stand-by mode’.
Yes
Check the RF source and check the
connection of RF cable.
No Input the RF source properly.
Yes
1
Check the ‘signal strength’ in Self
Diagnosis menu Strength is enough ?
No Check the D-TV source.
Yes
2
Check the Power of Tuner ?
Pin #1 of Tuner : A3.3V_Tuner
-
Pin #4 of Tuner : A1.8V_Tuner
-
No Change the Main Ass’y.
Yes
2
Check the LVDS clk signal at output of
Main board. (TX)
TX6_CLK : TCON SDA
-
TX8_DATA : TCON SCL
-
No
Check IC1400(NT14U)
Change the Main Ass’y.
Yes
Check the LVDS cable?
Replace the T CON / LCD panel?
No Please, Contact tech support.
Caution Make sure to disconnect the power before working on the IP Board.
4-13
4. Troubleshooting