Problem with Panasonic PT-43LC14: Yellow tint covering most of screen. Convergence ok - Page 8 - AVS Forum
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post #211 of 238 Old 05-22-2013, 12:22 PM
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I put the glass in first and the film in on top of the glass.
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post #212 of 238 Old 05-23-2013, 12:54 PM
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Me 2
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post #213 of 238 Old 06-03-2013, 10:50 AM
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I also got film from the person in this post. My TV is a PT-60LC-13, 60" and the film he sent me was too small so he sent me some uncut film that I could size. Worked great .. FOR A WHILE. Now I have the yellow back again. I was able to keep the original filter and this time around I'm planning on epoxy gluing it to the glass. (I'm looking for high temp optical epoxy)

Is everyone else still OK with their film? I've only had mine done for about 3-4 months.
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post #214 of 238 Old 06-05-2013, 03:23 PM
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No problems since January! Brother is very happy about that!
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post #215 of 238 Old 06-15-2013, 06:02 PM
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I have mostly disassembled my tv and I have the service manual downloaded and printed but it doesn't actually talk about how to disassemble the projector assembly. Like how do I get the actually projector lens and what appears to be some sort of ballast off the top of the projector unit so that I can actually view the polarizing lenses? I should be able to look straight down onto them. I am afraid I am going to or already have removed too many unnecessary parts and will have great difficulty getting everything put back together. Anyone have disassembly pictures? There's nothing helpful on YouTube either...
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post #216 of 238 Old 06-19-2013, 11:28 PM
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Hey, i tried cleaning the filter but i broke the glass. Need replacement glass and filter. Would anyone happen to have one they could sell or know of how to get one for cheap?
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post #217 of 238 Old 06-20-2013, 01:11 PM
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you shouldn't need the glass. the part is like a $200 part so unlikely to find. there is nothing special about the glass far as i know, you could cut a piece from window glass if you really wanted glass in there.

for Jason; look at my previous posts; i have detailed photos about disassembling the light engine step-by-step. the ballast doesn't need to be disassembled and the light box does not need to be removed from the TV just the middle component the light engine.
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post #218 of 238 Old 08-25-2013, 05:11 PM
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After a few months the yellow is back. Slightly different shape than before, but just as annoying!

Looking at the old part, it seemed to burn in the center with a space anound the damaged section that is still clear.

Any ideas how to stop this from happening?

Here's a photo of what my old one looked like:

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post #219 of 238 Old 08-26-2013, 01:23 PM
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i think i noticed a little yellow in my brother's TV a couple nights ago (after about 7 months). I bought two of the filters at the same time. I suspect an add'l piece of glass to knock down the UV from the lamp may help; perhaps a sandwich of glass; i'm not sure which side the light comes from.

for a piece of glass, taking apart a uv-protecting lens filter for a camera ought to do the trick. (use a dremel to cut the ring off then traditional glass cutter to cut down into a rectangle.

I will wait 'til it gets much worse before i monkey with it; maybe it'll make a year. I didn't glue on the filter so it should be a very easy swap this time, i wonder where i put that spare filter

-awr
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post #220 of 238 Old 08-26-2013, 02:11 PM
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It seems like it is always darker on the bottom, and gets clear towards the top... Like the filter is at a slight angle maybe?
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post #221 of 238 Old 08-27-2013, 02:38 PM
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my guess would be just from airflow. the filter picks up microscopic dust and once some dust is there for the light to heat up it's a cascading failure situation like a snowball rolling downhill and getting bigger.
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post #222 of 238 Old 08-27-2013, 05:46 PM
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Quote:
Originally Posted by andrewwynn View Post

my guess would be just from airflow. the filter picks up microscopic dust and once some dust is there for the light to heat up it's a cascading failure situation like a snowball rolling downhill and getting bigger.

But why only the blue? Mine only lasted a three months.
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post #223 of 238 Old 08-28-2013, 01:48 PM
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if i had to guess on the blue; the shorter higher power wavelengths associated with blue/near UV.
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post #224 of 238 Old 08-28-2013, 02:18 PM
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Do you think we just need a better quality film for the polarizer? If we knew the specs to use we could find something. Any idea how we could figure that out?
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post #225 of 238 Old 08-29-2013, 10:12 AM
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I just repaired my TV, here is my email to Jim who sent me the polarizer. Please disregard any spelling errors. I used to repair TV's for about 7 years, during the hayday of RPLCDTV's. SO I have seen quite a few of this. I have been out of the game for a while and didn't know a cheap source for the part.

"the dirty deed is done. And I mean dirty.... I spent plenty of time cleaning dust out as I'm sure you did as well.

In my professional opinion, the location of the air filter that feeds the fan that cools the LCD panels and polarizers (that was a mouthful) is poorly placed and difficult to clean without full disassembly. The root of our woes, blue has the highest energy waves, and is most critical to keep cool.

Sony had a real big batch of this same problem on their LCD projection sets....reeaallll bad. I changed out SO MANY Sony light engines and EVERY ONE had the same yellow blotchy picture......

They had a recall put out on them where we removed the light engine, and put some new ductwork that put the air filter (for the LCD panels and polarizers) in a very accessible place, all you had to do was remove the back and vacuum that filter (after the recall)

I don't know about your air filter (on the bottom of the light engine directly under the lense) but mine was fully clogged, when I attempted to vacuum the filter it was so old and rotten that it ripped badly (frowny face).

SOOOOoooo, I took some foam padding and cut it to size (kind of sloppily) and squeezed it under there after everything was in its place.

If you want a picture I can get one easily. I would suggest that to avoid this problem in future, all owners of this set replace that filter with one they can easily pull out and vacuum.

Thanks again for the cheap fix! It is much appreciated, I have been dealing with this for MONTHS!

I did crack the glass while using a razor to scrape it.... oh well, I just took it out and put in the filter as suggested.

Thanks again!"

So in a nutshell, I believe it is a clogged air filter that causes the hottest polarizer to burn out, the flow of air is from the bottom up, and the top of the polarizer is always burning first, probably because there is justI enough airflow to cool the bottom of the polarizer (the polarizer is upside down in reference to the picture).
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post #226 of 238 Old 08-30-2013, 07:27 AM
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Very interesting!!! Any chance you can post pics of how you replaced the filter?

What kind of material could you use to make the replacement filter? Could I cut a piece out of some other filter, like a furnace filter or one from a vacuum cleaner?
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post #227 of 238 Old 09-15-2013, 08:58 AM
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OK I know you’re all wanting to know how my TV is doing…smile.gif

Jim was kind enough to send me another hunk of polarizer, so I went to do the repair again.
The polarizer from the previous repair was burnt as expected, but this time it was a different shape to the burn mark, and the film had warped.




When I removed the bad film, there was condensation under it, and it was the exact shape of the burn.





Not sure what to make of that. for now I’m back up and running though, looks as good as new (again)!

-ßob
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post #228 of 238 Old 09-26-2013, 11:00 AM
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I read all the posts and contacted Anchor Optics to inquire about their Vermillion color polarizer film (stock# AX27803).

Unfortunately, this item is no longer available. I have been searching to find other vendors without any luck.

 

Does anyone know where I can buy this film?

 

thanks,

jim

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post #229 of 238 Old 09-27-2013, 09:24 PM
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Superlemur will sell you a hunk for $10
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post #230 of 238 Old 09-30-2013, 05:16 PM
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Mine pooped out again as well. It is yellow on the bottom.

I hesitated to post any photos of the air filter modification on the chance it didn't work, well it didn't. It clogged up fast.

I will see if I can get another filter from Superlemur as well. I am seriously wondering if it is an airflow issue....

Mike
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post #231 of 238 Old 10-01-2013, 06:02 PM
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Mine happend the 1st time right after changing the bulb, i wonder if I got a defective one.
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post #232 of 238 Old 10-20-2013, 09:55 AM
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I have a Panasonic PT-60LC14 with the yellow glob starting in the center. I am mechanical but would you share whatever info, instructions procedures and where to buy what with me. I am retired and would like to fix this TV if possible.

 Thanks for any help

 Dean

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post #233 of 238 Old 01-05-2014, 04:02 PM
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As of January 2014, I still have plenty of polarizer pieces that will repair your yellowed areas on Panasonic models PT-43LC14, PT-50LC14 and PT-60LC14. spanner56@aol.com
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post #234 of 238 Old 06-13-2014, 10:12 AM
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Is anyone out there looking for parts or one of these tvs? I have a 60" version in Cincinnati, Ohio. It looks to be the ballast again. I have 2 lamps for, including the one in the tv. About 15 months ago I cleaned out the entire inside and performed the blue polarizing filter fix (not perfect but pretty good IMO) and put in a rebuilt ballast. After that I swore that it was out on the next problem.

Now it turns itself off after a few minutes with a voltage error. If you want a project here you go .. till, let's say the 19th of June. First come first served.

Cincinnati, Ohio, available till June 19.

PM me ..
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post #235 of 238 Old 06-14-2014, 09:12 PM
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Recently replaced the TV with a 60" plasma. It was still working well, and looking for a home; free for the taking; south east wisconsin area.
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post #236 of 238 Old 08-23-2014, 10:46 AM
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So glad to see that this thread is still alive and kicking. I found this thread a few years ago when searching yellow screen pt-43lc14-k and it has been the best source of info for this problem. Last year I bought two pieces of film from superlemure and FINALLY got around to fixing it yesterday. The fix went well and the colors are back to normal.

The problem I have now is the air filters fell apart with the slightest touch so I removed all the old stuff and put some material suggested by the TV repair guy. What i get, once put back together is the "clean air filter, unit will turn off in one minute" message. So I'm guessing the material i'm using doesn't allow proper airflow and the sensors are reading it as a clogged filter.

I will be doing some searching on my end for a proper replacement material but would like any info you guys might have on this. I have a vacuum cleaner specialist right next door that i will be visiting today in the hopes that they have something that will do the job. I will post any info I find.

Thank you to all who contributed to this thread and a special thanks to superlemure.

Last edited by PT-43LC14-K; 08-23-2014 at 10:51 AM.
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post #237 of 238 Old 08-24-2014, 07:43 PM
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Quote:
Originally Posted by PT-43LC14-K View Post
So glad to see that this thread is still alive and kicking. I found this thread a few years ago when searching yellow screen pt-43lc14-k and it has been the best source of info for this problem. Last year I bought two pieces of film from superlemure and FINALLY got around to fixing it yesterday. The fix went well and the colors are back to normal.

The problem I have now is the air filters fell apart with the slightest touch so I removed all the old stuff and put some material suggested by the TV repair guy. What i get, once put back together is the "clean air filter, unit will turn off in one minute" message. So I'm guessing the material i'm using doesn't allow proper airflow and the sensors are reading it as a clogged filter.

I will be doing some searching on my end for a proper replacement material but would like any info you guys might have on this. I have a vacuum cleaner specialist right next door that i will be visiting today in the hopes that they have something that will do the job. I will post any info I find.

Thank you to all who contributed to this thread and a special thanks to superlemure.
You're on the right track with the vacuum cleaner supplies, look at their generic HEPA filter material. You could also check HD/Lowes in the small gasoline tools department for replacement air filter material.
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post #238 of 238 Old 08-25-2014, 12:01 PM
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I went to the vacuum shop but they had nothing that had a good enough airflow. Vacuums have much more power than the small fan in the filter box of this TV. My new lead is computer repair shops, it seems they sell this exact same foam for PC towers so I'll be checking that out this week.
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