Samsung UN F5500AF Series Service Manual page 41

No Video (Tuner_CVBS)
„
*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.
• Check the Tuner CVBS source.
• Check the Tuner.
Major
checkpoints
• This may happen when the LVDS cable connecting the Main Board and the Panel is
disconnected.
1
Diagnostics
2
3
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 RF source and check the
connection of RF cable ?
Yes
Check the Power of Tuner ?
Pin #4 of Tuner : B3.3V_Tuner
Pin #1 of Tuner : B1.8V_Tuner
Yes
Check the CVBS data out of IC1001 ?
C807 : Tuner CVBS
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 Change the Main Ass'y.
Check IC1001(X12).
No
Change the Main Ass'y.
Check IC1001(X12).
No
Change the Main Ass'y.
No Please, Contact Tech support.
4. Troubleshooting
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