Samsung LE19C45 Series, Service Manual

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4-10
4. Troubleshooting
4-1-5. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the Tuner CVBS source.
-
Check the Tuner, Check the Chelsea.
-
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
Change the Main Assy
No
Yes
Does the DC B5V_PW, TU33V_PW
appear at pin #3, 5 of tuner?
No
Yes
Is power inductor LED off?
Lamp(Backlight) on and no video?
Yes
Check the RF source
and the connection.
No
Input the RF source properly.
Yes
Check Tuner
Change the Main Assy
Yes
Check the LVDS cable?
Check the T-Con B’d?
Replace the LCD panel?
Please, Contact Tech support
No
Does the CVBS data appear at R836?
Does the digital data appear at
OD(D3+),
ODD_TXCLK-(D3-)?
No
Check IC1102(SETD-10).
Change the main Assy.
4
2
No Check a set
in the ‘Stand-by mode’.
Caution Make sure to disconnect the power before working on the IP board.