Samsung PN50C450B1DXZC, Service Manual, Page: 42 / 73

4-6 Samsung Electronics
Troubleshooting

No Picture (When audio is normal)
Symptom Audio is normal but no picture is displayed on the screen.
Major
Checklist
- This may happen when the Main Board is functioning but the X, Y Main Board, Logic Board,
or Y Buffer Boards are not.
- The output voltage of the Main SMPS.
- This may happen when the LVDS cable connecting the Main Board and the Logic Board is
disconnected.
Caution
When separating and connecting the cables such as SMPS and X-Main Board, Y-Main Board
a spark may be generated by the electric charge of the high capacity capacitor. Therefore, wait
some time after disconnecting the power cord from the unit.
Yes
Replace the Logic Board
No
Replace the LVDS Cable
No
Yes
Check the LVDS connector.
Is it connected correctly?
Check the LED operation of
Logic Board. Is it normally operating?
(Normal : Blink once a second)
Replace the Main Board
No Picture (When audio is normal)
Replace the SMPS
No
Yes
Check the each output of the SMPS.
Are all voltages normal?