No Video (Tuner_Cvbs) - Samsung UN40D6400UF Service Manual

4. Troubleshooting

4-1-4. No Video (Tuner_CVBS)

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 Tuner CVBS source
-
Major Check the Genoa-P
-
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.
4-12
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 Power of Tuner ?
Pin #4 of Tuner : B3.3V_Tuner
Pin #2 of Tuner : B1.8V_Tuner
Yes
Check the CVBS data out of IC901 ?
C941 : Tuner CVBS
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.
No
Change the Main Assy.
No
Check Tuner and IC801(Arsenal).
Change the Main Assy.
Check IC1001(GenoaS) and
No
IC2001(Parma).
Change the Main Assy.
No
Please, contact Tech support.