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.
NO SOUND - PICTURE IS NORMAL
- When the speaker connectors are disconnected or damaged.
- When the sound processing part of the Main Board is not functioning.
- Speaker defect.
NO VIDEO
- Check the antenna connection settings (Air: NTSC / ATSC, Cable: NTSC)
- Check the CVBS cable connection.
- Check the power input of the Main board.
The above stated faults are almost common to all Plasma TVs, irrespective of Brand and Screen Size.
