Panasonic TH-58PZ800U blue tint in middle of screen - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 9 Old 12-17-2017, 02:31 PM - Thread Starter
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Panasonic TH-58PZ800U blue tint in middle of screen

Hello,

I have a problem with blue pixels appearing in the middle of the screen. I only notice that it appears on white backgrounds but not on all backgrounds that are white. There are many times when there is a white background on the video but no blue tint. The shape of the blue tint area changes as the video plays. I took a picture and have attached it (I know its not the best quality). Does anyone know what could be causing this issue and how to correct? Thank you!
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post #2 of 9 Old 12-17-2017, 03:23 PM
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Take the back cover off and adjust the YSUS screw on the power supply. Be careful not to touch anything but the plastic YSUS screw with your screwdriver. Adjust it a quarter turn at a time and see if it goes away. Remember where it's original setting was.
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post #3 of 9 Old 12-18-2017, 06:35 PM - Thread Starter
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Originally Posted by Test Ickles View Post
Take the back cover off and adjust the YSUS screw on the power supply. Be careful not to touch anything but the plastic YSUS screw with your screwdriver. Adjust it a quarter turn at a time and see if it goes away. Remember where it's original setting was.
Thank you for the response. Do I turn the screw in a specific direction?
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post #4 of 9 Old 12-18-2017, 06:50 PM
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I want to say clockwise will lower the voltage and counter will increase. I could be wrong. Experiment in small increments. You won't hurt anything.
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post #5 of 9 Old 12-18-2017, 06:54 PM
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You can do it with the TV on and a helper. Just be careful not to short anything out with your screwdriver.
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post #6 of 9 Old 01-18-2019, 12:39 PM - Thread Starter
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You can do it with the TV on and a helper. Just be careful not to short anything out with your screwdriver.
I only see a Vsus trim VR on the power supply board. There is another VR pot labeled Vd. How does one find the YSUS screw on the power suppy?
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post #7 of 9 Old 01-18-2019, 02:35 PM - Thread Starter
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I only see a Vsus trim VR on the power supply board. There is another VR pot labeled Vd. How does one find the YSUS screw on the power suppy?
I turned the Vsus trim pot 1/4 turn clockwise and the problem resolved. To confirm the solution, I turned the trim pot back counter clockwise 1/4 turn, and the problem returned. So, it looks like the Vsus trim pot adjustment resolved the problem.
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Last edited by hrpuffnstuff; 01-21-2019 at 04:23 PM.
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post #8 of 9 Old 01-19-2019, 12:27 PM
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I turned the Vsus trim pot 1/4 turn to the right and the problem resolved. To confirm the solution, I turned the trim pot back to the left 1/4 turn, and the problem returned. So, it looks like the Vsus trim pot adjustment resolved the problem.
Good job!
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post #9 of 9 Old 01-12-2020, 05:12 PM
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Thank you both for this post. Turned vsus 1/4 clockwise and the blue blob went away. My 13 year old Panny PX75U lives on. Cheers!!
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