No Component Video(Component) - Samsung 820DXn Service Manual

4. Troubleshooting

4-6. No Component Video(Component)

Symptom The LED power turns on but the screen is blank when the Component cable is connected.
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Check the Component cable connections.
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Major
Check whether the LVDS cable is connected correctly to the panel.
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checkpoints
Check whether the lamp connector of the panel is connected correctly to the IP board.
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Diagnostics
Does 3.3V appear at ZD114 ~ 118?
R178(Pr) ⑪, R180(Y) ⑫, R1013 (Pb)
Does the TX** signal appear at Pin 14
Check the cable between the main
board and panel and replace the LCD
Caution Make sure to disconnect the power before working on the IP board.
4-10
Yes
Does the waceform appear at
⑬?
Yes
and 15 of CN403?
Yes
panel.
CN403
R178,R180, R182
ZD114 ZD115~113
Main Board Front
No
No
No
Press the power button and
check the LED.
Reconnect the component
cable.
The scaler (IC408) is
abnormal.
Replace the main board.