Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
Glad to see you got your fixed, I've been off this forum for awhile so sorry I didn't get back to you sooner. Mine was actually the ribbon cable end which connected to the D board -- just became slightly unplugged which caused this problem. Just pushing it back in place fixed it.
consult20
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Last Activity: 09-10-2012, 01:13 PM
Joined: 11-28-2011
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Toshiba 40RF350U LCD - Vertical Colored Lines
I've researched the "vertical colored lines" problem with this Toshiba LCD, and based on everything I've read it seems to be related to bad ribbon cable connections from the LCD panel to the PCB. It seems like a really common problem with this particular model.
But I'd appreciate some input on this since there are actually two things going on with it. When the tv is first powered on, there are vertical colored lines in the center and on the right side of the screen (see first pic). Then, after about 20 mins or so, the center vertical lines disappear (see second pic). As... -
Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
The Panasonic is impressive, and the picture is outstanding -- and it's still working flawlessly so I put it all back together now.
I know what you mean about cheap caps, a real weak point on a a lot of LCDs and plasmas it seems. At least they're cheap and easy to replace, even buying the best quality available.
Thanks again Tom, you really know your stuff!...Leave a comment:
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Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
If this ever happens again, I'll use tape on that connector as well -- good idea. I have no experience with LG at all, but yes it seems a lot of people don't think highly of their tv's. I've fixed LCD's from Polaroid, Vizio, and Samsung, and plasmas from Panasonic and Samsung. Had a 42" Sanyo plasma that wasn't worth fixing since the buffers and Y-main all went out. Too bad the manufacturers can't come up with a way to prevent the buffers from taking out the Y-main, seems like it shouldn't be that difficult to...Leave a comment:
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Re: FIXED!! Panasonic TH-42PZ80U Plasma Red Screen Issues
Tom,
The plasma is definitely working flawlessly again thanks to your excellent analysis of the problem. I ran it for several hours yesterday, and a couple hours this morning without incident.
And you were right about the location of the logic board, it was behind the A board fastened to a bracket with 8 screws. The bracket itself was held in place with 4 screws. And there were 10 connectors I had to unplug from the A board in order to get it out of the way.
Thank...Leave a comment:
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Re: FIXED!! Panasonic TH-42PZ80U Plasma Red Screen Issues
Tom,
You were spot on with the problem, it was a connector on the main logic board that had come loose. I had to remove the A board and bracket in order to get to the D board (logic board). I noticed immediately one of the connectors wasn't fully seated, so I simply plugged it back in securely and re-assembled the A board with a couple screws, and it's been working fine for over an hour. It had gotten to the point where it would go "red screen" within 5 minutes, so I'm very confident that it's now...Leave a comment:
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Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
I attached pics of the back of the tv, and a pic from the service manual identifying each board.
The problem is definitely heat related -- I put a small fan behind the tv blowing directly on the A board, and it ran fine for over an hour. Then I turned off the fan and the "red screen" issue showed up within 5 minutes.
I'm not sure how to proceed at this point, I'd appreciate any more advice on this....Leave a comment:
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Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
Yes the fans are all clean and work fine, the TV inside is very clean, almost no dust at all.
It does seem heat related since it only happens after the TV has been running awhile. But I'll make sure all connections are clean and secure first, and then will see if it happens again.
And I'll post some pics on Monday of the inside back of the TV, thanks again for the input and suggestions.Leave a comment:
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Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
Tom,
Yes this seems like a really a strange phenomenon, hard to explain so pictures were a must.
Is the control board also known as the main logic board?
Thanks again for your help.Leave a comment:
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Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
Tom,
Ok the TV just went into "red screen" mode, and yes the user controls are also affected by the red screen mosaic symptoms. See attached pics for examples. Thanks again....Leave a comment:
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Re: Panasonic TH-42PZ80U Plasma Red Screen Issues
Tom,
I just turned on the TV and will check to see how it affects the user interfaces like volume, menu, etc., and will post additional pics (it will take some time for the TV to go into "red screen" mode).
When I was taking pictures originally of this problem, another symptom is that when I change channels the screen goes completely solid red until the next channel tunes in (about 1 second or less). Attached is a picture I previously snapped quickly while changing channels.
...Last edited by consult20; 02-11-2012, 04:23 PM.Leave a comment:
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Panasonic TH-42PZ80U Plasma Red Screen Issues
Thanks in advance for any insight as to what may be the problem with this TV.
When the TV is first powered on, it works fine. Then after some time (may vary from 1/2 hour to several hours), the pictures gets very red -- almost looks like a red mosaic picture. I took some pictures of the red screen issues and have included links to the pics. Does this look like a problem with the Y-SUS or X-SUS board?
Thanks again for your help....
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