No Video (Video Cvbs 1, 2) - Samsung UN40D6400UF Service Manual

4. Troubleshooting

4-1-6. No Video (Video CVBS 1, 2)

N 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 Video CVBS source.
-
Major Check the Tuner, Check the Valencia.
-
checkpoints This may happen when the LVDS cable connecting the Main Board and the Panel is
-
disconnected.
Diagnostics
1
2
2
Caution Make sure to disconnect the power before working on the IP board.
4-18
MAIN 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 CVBS signal
at Input of IC801(Arsenal) ?
AV1 R501 : AV1_CVBS
AV2 R505 : AV2_CVBS
Yes
Check the CVBS clk signal at output of
IC801 (Arsenal)?
R807 : ASN_CVBS_CLK
Yes
Check the LVDS clk signal at output of
Main board ? (TX)
TX2_CLK : LV_TX2_DN/DP
TX4_CLK : LV_TX4_DN/DP
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
SMPS BOARD
T-CON
No
Check a set in the 'Stand-by mode'.
No
Input the RF source properly.
Check CN502 or CN501.
No
Change the Main Assy.
Check IC1001(GenoaS) and
No
IC2001(Parma).
Change the Main Assy.
Check IC1001(GenoaS) and
No
IC2001(Parma).
Change the Main Assy.
No
Please, contact Tech support.