Samsung UA40B7000WM Service Manual page 54

4. Troubleshooting
4-1-7. No Video (Component 1)
Symptom Audio is normal but no picture is displayed on the screen.
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Check the Component source
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Major
Check the Chelsea
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Caution Make sure to disconnect the power before working on the PD board.
CN3001 CN3001
9
Diagnostics
5
4-20
CN3005 CN3005 CN3004 CN3004
CN3011 CN3011
No video
Yes
Check component source and
check the connection of
component cable ?
Yes
Does the signal appear at R3065,
R3064, R3066(Y, Pb, Pr)?
Yes
Does the digital data appear at
RA6004, RA6005, RA6006 (Rout)
RA6007, RA6008, RA6009 (Gout)
RA6001, RA6002, RA6003 (Bout)?
Yes
Does the digital data appear at
pin14~42 of CN7005?
Yes
Check the LVDS cable?
Replace the LCD panel?
Input a component signal.
No
Check the connected cable.
No
Check CN3004
Change the main PCB assy
No
Check IC6001
Change the main PCB assembly
No
Check IC7001
Change the main PCB assembly
No
Please, contact Tech support