Samsung LA22B450C4H, Service Manual

Page: 203 / 265

4-7
4. Troubleshooting
4-1-4. No Video (HDMI 1, 2 - Digital Signal)
Symptom Audio is normal but no picture is displayed on the screen.
-
Major
checkpoints
Check the HDMI source.
Check the HDMI switch, Check the Chelsea.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
-
-
Diagnostics
Check CN6009, CN6002, CN6004
Check HDMI cable
Change the Main Assy
No
Yes
Power Indicator is off.
Lamp(Backlight) Off, no video?
Yes
Check the HDMI source and check
the connection of HDMI cable?
No
Input the HDMI signal properly
Yes
Yes
Check the LVDS cable?
Check the T-Con B’d?
Replace the LCD panel?
Please, Contact Tech support
No
Does the signal appear at
CN6009 (Pin#12 , #7 )(HDMI1)
CN6002 (Pin#12 , #7 )(HDMI2)
CN6004 (Pin#12 , #7 )(HDMI3)
(HDMI RX_Clk , RX_Data)?
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
No
Check IC4010 (Saturn4)
Change the Main Assy
3
2
No Check a set
in the ‘Stand-by mode’.
Caution Make sure to disconnect the power before working on the IP board.