Samsung UA40C6200UF Service Manual page 70

4. Troubleshooting
4-1-3. No Video (HDMI 1, 2, 3, 4 - Digital Signal)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the HDMI source.
-
Major
Check the HDMI switch, Check the Valencia.
-
checkpoints
Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
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3
Diagnostics
2
Caution Make sure to disconnect the power before working on the IP board.
4-12
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the HDMI source and
check the connection of HDMI cable ?
Yes
Check the signal at Input of Main board ?
D3903
D3905
D3907
D3901
Yes
Check the signal at Output of
'HDMI switch IC' ?
IC601  IC3013
Yes
Check the LVDS clk signal at output of
Main board ?(TX1~TX4)
TX2_BP, TX2_CN, TX2_CP, TX2_CLKN
TX4_BP, TX4_CN, TX2_CP, TX2_CLKN
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
No
Check a set in the 'Stand-by mode'.
No
Input the HDMI signal properly.
Check CN3013, CN3016,
CN3015, CN3010.
No
Check HDMI cable.
Change the Main Assy.
Check IC3013 (HDMI switch).
No
Change the Main Assy.
Check IC1101 and IC7001.
No
Change the Main Assy.
No
Please, Contact Tech support.