Samsung UN F5500AF Series Service Manual page 44

4. Troubleshooting
No Video (Tuner DTV)
„
*Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
• Audio is normal but no picture is displayed on the screen.
Symptom
• Check the DTV 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.
4-12
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 'signal strength' in Self
Diagnosis menu Strength is enough ?
Yes
Check the Power of Tuner ?
Pin #4 of Tuner : B3.3V_Tuner
Pin #1 of Tuner : B1.8V_Tuner
Yes
Check the LVDS clk signal at output of
Main board.(TX)
TX2_CLK : ODD_TXCLK_DN/DP
TX4_CLK : EVEN_TXCLK_DN/DP
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 Ass'y.
Check IC1001(X12)
No
Change the Main Ass'y.
No Please, Contact Tech support.