Panasonic TH-42PX50U problem - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 7 Old 10-17-2019, 02:59 PM - Thread Starter
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Panasonic TH-42PX50U problem

I've had this panel since 2005 so I've gotten 15 trouble free years out of it. The other day my wife said when she turned it on it had a bunch of colored horizontal lines across the display that eventually went away as the panel heated up. Of course when I turned it on it didn't do it that time. Flash forward a couple of days and now it's doing it every time we turn it on and I noticed a few faint black horizontal lines off and on last night.

Any clue/suggestion on what it could be and can it be fixed (I'm an engineer so I have no problem taking it apart and swapping boards etc) AND this is the biggest question would parts be available?



I'd love to fix this panel as it still has (had lol) a great picture and I don't want a new "smart" TV as I don't like the big companies "privacy policies" as it seems they don't take your privacy seriously and just want to sell your information.
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post #2 of 7 Old 10-18-2019, 08:07 AM
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Originally Posted by theandies View Post
I've had this panel since 2005 so I've gotten 15 trouble free years out of it. The other day my wife said when she turned it on it had a bunch of colored horizontal lines across the display that eventually went away as the panel heated up. Of course when I turned it on it didn't do it that time. Flash forward a couple of days and now it's doing it every time we turn it on and I noticed a few faint black horizontal lines off and on last night.

Any clue/suggestion on what it could be and can it be fixed (I'm an engineer so I have no problem taking it apart and swapping boards etc) AND this is the biggest question would parts be available?



I'd love to fix this panel as it still has (had lol) a great picture and I don't want a new "smart" TV as I don't like the big companies "privacy policies" as it seems they don't take your privacy seriously and just want to sell your information.
I would rather check the used market to get a similar (and) newer model.. Pansonic PX80U for example.. Better contrast, lower power draw, more HDMI Inputs..
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2013 Panasonic TX-P42STW60 PDP
2013 Panasonic TX-P42X60E PDP
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post #3 of 7 Old 10-18-2019, 08:12 AM
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I just saw your comment on the "run hours" thread.. Almost 50k run hours..

That is really alot.. You should get used similar Plasma tvs with more then half of this usage for very low prices..
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2013 Panasonic TX-P42STW60 PDP
2013 Panasonic TX-P42X60E PDP
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post #4 of 7 Old 10-21-2019, 02:12 PM - Thread Starter
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I just saw your comment on the "run hours" thread.. Almost 50k run hours..

That is really alot.. You should get used similar Plasma tvs with more then half of this usage for very low prices..



Yes, I'm very happy with my 2005 purchase. It's been a great panel and will be missed even though it's so outdated technology wise. People would still comment on what a great picture it has (had ) to this day.

I've looked into getting a used plasma on fleabay etc. I'm just a little worried about buying used.
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post #5 of 7 Old 10-21-2019, 02:57 PM
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Yes, Plasma is second hand market only..

Or you can ask some people you know.. someone always knows someone and this someone knows someone that has a Plasma and does not need it anymore..


2013 Panasonic TX-P42STW60 PDP
2013 Panasonic TX-P42X60E PDP
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post #6 of 7 Old 01-10-2020, 11:53 AM - Thread Starter
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So after a few hours of sifting through the internet I've found the service manual, a training manual and of course the operations manual that comes with the TV.
Going through all the information I think I've diagnosed the problem. I can't verify it because I don't have an oscilloscope but I think the D board in my set is bad. The D board is the main panel control board. I found a few on e-bay and have one on the way for $10!!! It appears that e-bay has pretty much every board for my TV pretty cheap so if this doesn't do it I'll keep trying. I might even pick up a good used o-scope, always wanted one so now I have a pretty good excuse......
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Sony 2019 Sony XBR-55A8G
Panasonic TH-42PX50U - 49,203 hours! DIED :-( then resurrected by me on 1/16/2020!!!!!

Various "cheap" TV's in kids room and video game room.
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post #7 of 7 Old 01-16-2020, 02:44 PM - Thread Starter
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FIXED.
The D board didn't cure the issue but when doing the self-test with the "new" D board it gave me an SOS code 6. After reading about the blinking power light or what is called SOS codes ( I did not have the blinking light) I came to the conclusion that it would probably be the SC board. I did some other voltage checks per the manual and was 99% sure it was the SC board without an oscilloscope to really verify. E-bay to the rescue. Ordered a SC board for $14. It arrived today and now I have my old Panasonic back in business for less that $50.

Here is a great web-site for service manual if you are a DYI kind of person like myself. Of course it helps that I'm and electronics engineer.

https://www.manualslib.com/products/...0u-298627.html


Of course this link is for my set but you can search to see if yours is there. Now I have an old POS Sanyo to fix. It's the kids gaming TV.
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Sony 2019 Sony XBR-55A8G
Panasonic TH-42PX50U - 49,203 hours! DIED :-( then resurrected by me on 1/16/2020!!!!!

Various "cheap" TV's in kids room and video game room.
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