4-2-3. No Video (Tuner_CVBS)
Note
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 Tuner.
•
This may happen when the LVDS cable connecting the Main Board and the Panel is
•
disconnected.
Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
No
Check a set in the ‘Stand-by mode’.
Yes
Check the RF source and check the
connection of RF cable.
No
Input the RF source properly.
Yes
1
Check the Power of Tuner ?
Pin #1 of Tuner : A3.3V_Tuner
-
Pin #4 of Tuner : A1.8V_Tuner
-
No
Change the Main Ass’y.
Yes
2
Check the CVBS data out of IC1400 ?
L903 : Tuner CVBS_OUT
-
CVBS_OUT_TP : IC1400 CVBS_
-
OUT
No
Check IC1400(NT14U).
Change the Main Ass’y.
Yes
2
Check the LVDS clk signal at output of
Main board. (TX)
TX6_CLK : TCON SDA
-
TX8_DATA : TCON SCL
-
No
Check IC1400(NT14U).
Change the Main Ass’y.
Yes
Check the LVDS cable?
Replace the T CON / LCD panel?
No
Please, Contact tech support.
Caution
Make sure to disconnect the power before working on the IP Board.
4-10
4. Troubleshooting
All manuals and user guides at all-guidesbox.com
