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My panasonic plasma th50pz800A decided to shut down whilst switched on, was not in the room at the time to see what happened.I reset the powerboard to the tele now it will not show picture or sound green power light goes on turns red and flashes and have noticed large fault/crack in the centre of the panel behind the glass

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  • smhawthor273 Apr 21, 2009

    Hi Taran,

    Thankyou for your reply, additional info tele is less than 6 months old do you think

    warranty would cover this?? also I was using a surge protect cut out powerboard so how could this happen??

  • smhawthor273 Apr 27, 2009

    Have phoned panasonic support and have had no assistance as yet, they asked for the fault code (how many times red light flashed)through the power button blinking, it was seven times does anyone know what that error code is referring to.



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I'm sad for you and wanna inform you that your picture tube is gone due to powerboard circuit failure.

These board get power from SMPS and they are temperature dependent. So, 7 times blinking indicates power transformer failure. In that condition you need to follow the following procedure :

First, unscrew the back panel of the tv console (should be a bunch of 1/4" hex head screws). There will then be a large white panel at a 45 degree angle held in place by two tabs or maybe even screws. Remove it to see the CRTs. A quick check for the blurry problem is to look directly into the CRTs while the tv is off. DO NOT do it while they are on if you can help it, as it is not good for your eyes.
Shine a white LED flashlight down into each of the CRT's top lenses. Avoid classic incandescent light in this case, since you will be looking for the difference between white and yellow. I you see a white plate inside, good. If the inside looks yellow, and has floating things in it, then the coolant fluid inside is old and bad. You can replace this, but it is a VERY delicate task and MUST be done in certain steps to avoid ruining the electronic boards anywhere within splash zone or drip reach of the lens couplers. The coolant is a special blend available at most tv repair shops, but it's basically clear antifreeze (which you wont likely find in an automotive store).

For the color being off, it is most likely the gain on each CRT being out of whack. First, change all of the user settings (in the on screen menu) for image, color, sharpness, etc to the middle or default.
With the back panel off, somewhere near the bottom of the inside there will be a small black plastic box with wires coming out the sides. This box should have 6 knobs on the front of it (the face facing the rear of the tv); 2 rows of red, green, and blue knobs. These are the screen controls for FOCUS and GAIN. And they should already have some sort of label telling you so.
I placed a mirror in front of my tv so I could see the screen as I adjusted, but you might be able to see it somewhat by hanging a sheet over the front of the screen and looking at it from the inside.
There's a much more in depth method to do this that is described in the service manual (which you are likely to have seen by now; they are usually either stapled to the back of the tv or hanging somewhere inside and easy to see)
But basically, just turn the knobs gently around until the picture looks about right to you. (Remember, if you turn them all up super bright, the CRT will not last very long. Try to keep the knobs near the middle of their turn ability)

If you want to do a full out overhaul of the screen, you'll have to make a lot of adjustments with a bunch of little knobs (variable resistors, really) on the computer board inside. The service manual will tell you what each one corresponds to, but most of them will have a subtle label on the board.

Rate the solution if it was really helpful to you.
Have a nice day!

With Regards,

Posted on Apr 27, 2009

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Hi Smhawthor273,

Regarding the problems you have with your plasma is vey rare......

No sound No picture - Usually power supply, might be an issue with powerfly or Horizontal Output Transistor....

Crack - Is that behind the LCD Screen? If yes, there might be a short circuit and that might have cause this. Now, there might be millions of connect millons and it might have affected any of the connections.

If that's a combination of power supply board / any other board and a crack - It would cost your pocket any way between 300-500 bucks. Even if you decide to Do It Yourself, It would cost you more than 300 bucks.

Is that really worth investing? That investmet wouldn't gauarantee a permanent fix and you would agree.

Now, the best bet would be to call a local tech and pay 45 bucks to check whether he could do anything.

Note - Rare would be the case there is only short circuit.

As far i believe, you have lost the plasma. Spending so many bucks on a dead plasma seems absurd.You can also check.Take a Voltmeter and check the continuity.

I hope my solution would have helped you to fix this,

Even still, you want to Fix, let me know so that i would be able to provide you with cost effective service manual.

Thanks for using Fixya.

Do rate the solution as "Fixya" if 100% satisfied.

Posted on Apr 21, 2009

  • taran_2005
    taran_2005 Apr 21, 2009


    I am dead sure it would be in warranty. All electronic items are usually have a warranty for one year and usually this includes in warranty.

    That might be one of the reasons for short circuit.Might be a wrong selection of surge might not handles the voltage easily and that might have caused a short circuit.

    However, we cannot jump on this conclusion without looking at the plasma.

    I would advise you to call panasonic support as this is only 6 months old. You are aware that this is a short circuit.This would able to have a better assistance from them.

    Let me also inform you as this is under warranty, even if they would charge for parts, i guess it would be less than 100-150 bucks depending on the fault. If that's a minor one, they would repair it without any cost.

    Thanks for using Fixya.

    Do rate the solution as "Fixya" if 100% satisfied.



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