Panasonic TH-42PZ700A-yellow shadow

[Baz273]

Hi
I have a problem with my plasma TV I have yellow and blue shadows appearing when the screen is white (white cloudy sky) I went into the service menu and have a picture of the white test screen all the other test pattens are OK.
Other than the yellow & blue shadows the picture quality is good and have no blinking lights on the TV, any suggestions would be appreciated.

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

That looks like either low Ve, -Vad or Vsus voltage. Can you post some pictures of the boards in the set?

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Hi Tom
I haven't taken the back off the TV, can the voltage be adjusted through the service menu or do you have to do it at the board?. I have downloaded the service manual for the TV and there is a section on adjusting the voltages but I'm not sure how to do this its not clear if this can be done through the service menu or not.
cheers

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

Unfortunately you'll have to do it by opening the case up. It can't be done via the service menu on these sets

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

I did reset the TV through the service menu this seemed to reduce the yellow color on white background when watching the TV. I'm not sure with my experience that I could do the adjustment so i guess I will see if it gets worse then get a price on having someone to take a look at the TV its 7 years old and as Panasonic no longer make Plasma TV's I can get the new Panasonic 50 inch led TV for about $1100 so if the cost is to much to repair this TV I will probably just upgrade . Thanks for your help Tom I really appreciate you taking the time.
Cheers

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Tom,what would cause the voltage to change on the power board? would it be better to install a new power board and would this new board need to be set up for the TV or just installed with no adjustments needed?
cheers

[kasfamily]

Re: Panasonic TH-42PZ700A-yellow shadow

to enable continuous service mode with a moving vertical white stripe for a few days

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

Every plasma panel is slightly different, so the Vs is adjusted to match as appropriate.
If you replace your power board, you will have to adjust Vs.
I would not immediately suspect the power board to be at fault. You need to check the voltages first.
If you do decide to upgrade, please give/sell this TV to someone who can fix it or live with the fault.

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

I did have the moving vertical white stripe running but not for long, would this fix the yellow/blue shadow problem?

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

As the fault does not appear to be typical burn in/image retention I don't think it will make any difference.

[kasfamily]

Re: Panasonic TH-42PZ700A-yellow shadow

Panasonic recommend this method.For 5 days was possible to eliminate defective pixels. Does not become worse.

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Just realised when rechecking the test pattens while scrolling through them the light on the power button is green until I get to the white screen where you can see the yellow/blue shadowing the light turns red blinking once every 2-3 seconds then after about 4 minuets the TV turns off and I have to unplug it from the wall socket to restart the TV. Not sure if this indicates a problem or not
According to the power blinking timing chart it says-STB SV SENSE Time out BD-Board

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

It's normal - it's part of the factory burn in test, I think it should turn on after some time automatically. Think that's how PZ80 (similar model) works.

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Tom, If I get time tomorrow I will take off the rear panel and take a photo for you.

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Tom, Haven't taken the back off as yet. I have ordered a digital multi meter as I only had a analog one I was going to check the Ve, -Vad or Vsus voltage as you advised.

The service manual says to (1) first perform Vsus adjustment (2) confirmation of Vscn voltage should be performed after confirmation of the Vad adjustment the when The Vad=140v, voltage of the Vscn is 8v +/- 1v. I guess when I have the back off the voltages will be on the panel label info?

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Anyone know what the SOS codes mean?

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

Those are no SOS codes.
Your TV has 26,000 hours. Wow, that is pretty high. Looks like it has burn in, though :/

[Baz273]

Re: Panasonic TH-42PZ700A-yellow shadow

Yeh thanks to Foxtel they have logos on every program. What do those pic numbers indicate? last time I checked they were PICT:00.00.00.00.00 I thought I read that these are fault codes but could be wrong

[tom66]

Re: Panasonic TH-42PZ700A-yellow shadow

I think it's a software version. SOS info is elsewhere.
Dubious award -- this is only the second Panasonic plasma I've seen with burn in.

[kasfamily]

Re: Panasonic TH-42PZ700A-yellow shadow

Ptct