Samsung UN55D6900WF - No Video (Tuner_Cvbs)

4-12
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. -
Major
checkpoints
Check the Tuner CVBS source -
Check the Genoa-P -
This may happen when the LVDS cable connecting the Main Board and the Panel is -
disconnected.
Diagnostics
MAIN BOARD
SMPS BOARD
T-CON
Input the RF source properly.
Check Tuner and IC801(Arsenal).
Change the Main Assy.
Please, contact Tech support.
Change the Main Assy.
Check IC1001(GenoaS) and
IC2001(Parma).
Change the Main Assy.
No
No
No
No
No
Yes
Yes
Yes
Yes
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Check a set in the ‘Stand-by mode’.
No
Yes
Check the RF source and
check the connection of RF cable ?
Check the CVBS data out of IC901 ?
C941 : Tuner CVBS
Check the LVDS cable?
Replace the T-con / LCD panel?
Check the Power of Tuner ?
Pin #4 of Tuner : B3.3V_Tuner
Pin #2 of Tuner : B1.8V_Tuner
Check the LVDS clk signal at output of
Main board ? (TX)
TX2_CLK : LV_TX2_DN/DP
TX4_CLK : LV_TX4_DN/DP
2
1
2
Caution Make sure to disconnect the power before working on the IP board.