PL42A450P_PL50A450P _ SAMSUNG PLASMA TV _ ERROR MODES

CHECK POINTS BY ERROR MODE

Check the power input to the Main Board.

Check the voltage in and out between the SMPS ß> Main Board, between the SMPS ß> X, Y Main Board, and between the Logic Boards.
NO POWER
Symptom:

The LEDs on the front panel do not work when connecting the power cord.
The SMPS relay does not work when connecting the power cord.
The unit appears to be dead.

Major check-list

The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:

Check the internal cable connection.
Check the fuses.
Check the output voltage of the SMPS.
Replace the Main Board.

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THE UNIT REPEATEDELY SWITCHES ON & OFF

The SMPS relay is repeatedly turning on and off. In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.

Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if each voltage output is correct.
If the symptom continues even when SMPS is operated alone, replace the SMPS.
If the symptom is not observed when operating the SMPS alone, find any defective assemblies by connecting the cables one by one.

When separating and connecting the cables such as CN810, CN809, CN808, CN807 of the Main SMPS, CN4701 of the X Main Board, and CN5707 of the 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.

NO PICTURE. AUDIO IS NORMAL

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.