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I turn it on it just keeps clicking on and off

I have a pansonic th 50px80u when i turn it on it just keeps clicking on and off i tried to count the blinks but they just never stopped , is there a ballast for this tv ?I believe i had this problem several years ago and that is the part that was replaced , i have searched for on but maybe they are calling it a different name

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Dgorksi sorry but no ballast in that model. This actually sounds like a powerboard or mainboard issue. Take the back of your TV and check the boards for obvious damaged components. Post some images of those boards with your question. That way we can see what you see.Adding images to an existing question

Update (11/05/2018)

Sorry, had no idea you already replaced the power board. Have you isolated where the clicking comes from? Relays on the power board? Check a few things and see if you get the right voltages:

When the TV is plugged in:

AC is applied to the standby circuit in the power supply to produce STB12V and STB5V.

The STB12V is routed thru the SS board and it’s returned back to the P board to turn on a switching circuit that outputs the STB5V. If the STB5V is missing, the TV is dead (No power)

The STB5V is output from the P board at pin 5 of connector P7 and it is applied to pin 5 of connector A7 on the A board.

The STB5V is applied to a 3.3V regulator to power the Main CPU (IC1100) on the A board.

When the Main CPU (IC1100) receives 3.3V, it outputs a temporary 2.7V/3.2V command that is provided to pin 6 of connector P7 on the P board. The function of this command is to turn on the circuit that generates the “F+15V” in the P board.

  1. The power command from the power switch on the S board or the remote control receiver on the K board is provided to the Main CPU on the A board thru connector A1. The CPU on the A board outputs the “F_STB_ON” Command and the PANEL_STB_ON” command.
  2. The “F_STB_ON” command is provided to pin 6 of connector P7 of the power supply to develop the F_STB+15V.
  3. The “PANEL_STB_ON” is used to turn on the STB3.3V regulator on the A board. The output voltage is applied to the “Panel” CPU on the A board (Formerly located in the D board).
  4. When the “Panel” CPU on the A board is energized, it outputs the “PANEL_MAIN_ON” Command (3.2V) to pin 11 of connector P25 on the P board.

The PANEL MAIN ON command turns on the power supply circuit that outputs the Vsus, Vda, 15V, and 5V.

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i have already replaced the powerboard, I was thinking it was something else because I dont get the seven or ten blinking lights it just keeps blinking , that was rthe first thing i tried

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I don’t have the answer to your question however, my tv is doing the same thing. It clicks for a while but will eventually turn on. I also noticed that after the tv has been on for a while and is all warmed up, if you turn it off for a short period of time when you turn it back on, since it’s still warm it will turn right back on without the clicking.

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