SMPS Panel voltages must be adjusted after changing SMPS-PCB or PDP module.
SMPS MAIN VOLTAGE ADJUSTMENT POINT
SMPS DC/DC ADJUSTING POINT
Use base chassis of PDP panel as GND point.
TROUBLESHOOTING
- 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 power of the unit seems to be out of order.
The SMPS relay or the LEDs on the front panel do not work when connecting the power cord if the cables are improperly connected or the Video Board or SMPS is out of order. In this case, check the following:
- Check the internal cable connection status inside the unit.
- Check the fuses of each part.
- Check the output voltage of SMPS.
- Replace the Main Board.
- The SMPS relay is repeatedly turned 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 ASSYs by connecting the cables one by one.
When separating and connecting the cables such as CN809 of the Main SMPS, CN1, CN2, CN3, CN4 and CN5 of DC-DC SMPS, CN of the X Drive Board, and CN of the Y Drive Board, a spark may be generated by the electric charge of the high capacity capacitor. Therefore, wait some time after separating the power cord from the unit.
- Audio is normal but no picture is displayed on the screen.
- This may happen when the Video Board is normal but the X, Y Drive Board, Logic Board, or Y Buffer Boards are out of order.
- The output voltage of the Main SMPS or the DC-DC SMPS is out of order.
- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.
When separating and connecting the cables such as CN809 of the Main SMPS, CN1, CN2, CN3, CN4 and CN5 of the DC-DC SMPS, CN of the X Drive Board, and CN of the Y Drive Board, a spark may be generated by the electric charge of the high capacity capacitor. Therefore, wait some time after separating the power cord from the unit.
Video is normal but there is no sound.- When the speaker connectors are disconnected or damaged.
- When the sound processing part of the Video Board is out of order.
- Speaker defect.
A normal/cable network analog broadcast screen is blank or abnormal.
- Check the antenna connection settings. (Antenna 1 - NTSC (Cable), 64QAM, 256QAM, Antenna 2 - NTSC (Air), 8VSB (ATSC))
- Check the tuner output signal (CVBS).
- Check the power input of the Main board.
