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[alsie731]

Yellow spot in the center of my scree - any suggestions on what it is and how to fix

[Eddie]

First instinct is a bad light engine. Maybe start saving for a new TV.

Give some more info though, as I could be wrong. Can you snap a photo and show us?

Yellow spot in the center of my scree - any suggestions on what it is and how to fix

[alsie731]

cannot get a pic of the yellow spot - it really is hard to show it up unless picture is showing white in the center area such as a hockey game (ice area) or a picture that is of a lighter color in that area - area on middle of the screen is around a 6" area almost a circle to a egg shape - will try and get a pic when I can get a program that will show it up - am going to try and remove back of set to vacumm accumulated dust and clean where I can get to - probably the kiss of death - spot at this point is in a way livable - but drives me crazy at times - always looking for it - when shutting off set it does not show yellow spot left on screen - set purchased 1/04 - appreciate greatly your reply Eddie

[Eddie]

To give you an idea of what I think it's the light engine...

This is how LCD projection works.. if your Panasonic is a LCoS, D-ILA, SXRD, or other type of LCD projection:

LCD Projection Technology goes by many different names. This one is LCoS.

639px-Lcos.svg.png (26.49 KiB) Viewed 14511 times

The three color LCD chips (Red, Green, and Blue, or RGB) combine colored images to create picture. If one of those chips should fail... or melt, or become defective... as in your case possibly, the color will show up funny on your screen.

For example, if the blue (B) LCD chip were melted or not letting as much blue light through in the middle (your egg shape), that would cause the area in the egg shape to be a but more yellowish in color.

A bad LCD chip can ruin your day... and you may be better off buying a new TV.

faulty-d-ila-or-lcd-chip.jpg (40.89 KiB) Viewed 14512 times

I hope that answers your question.

cannot get a pic of the yellow spot - it really is hard to show it up unless picture is showing white in the center area such as a hockey game (ice area) or a picture that is of a lighter color in that area - area on middle of the screen is around a 6" area almost a circle to a egg shape - will try and get a pic when I can get a program that will show it up - am going to try and remove back of set to vacumm accumulated dust and clean where I can get to - probably the kiss of death - spot at this point is in a way livable - but drives me crazy at times - always looking for it - when shutting off set it does not show yellow spot left on screen - set purchased 1/04 - appreciate greatly your reply Eddie

[alsie731]

Eddie, me thinks you have hit it right on the button - just got through doing a thorough cleaning (not really much dust) & no change - I have a lot of hours on the set and have gone through 3 bulbs all with a extremely long lifetime where others have not been so lucky - I will have to live with it I guess until it really is unbearable and craps out & will have to start saving for a new one - appreciate very much your diagram and explanation - looks like CRT sets (if that's what the old picture tube ones are) last soooooooooooooo much longer than DLP's do - wonder if LCD ones last longer - opinion please

[Eddie]

I just amended the post above.

Your Panasonic is actually an LCD projection, similar to DLP, but uses 3 colored LCD chips to combine colors instead of a DMD chip to reflect light. CRTs do last longer, but that's because the technology has been around for over half a century in modern use! Just imagine 50 years from now... will DLP technology get better? Or will be abandon it for LCD or Plasma...

My opinion is that DLP and LCD projection technology is really clean and technology should still be researched, but the cost of LCDs and Plasmas are so inexpensive now that a big screen LCD is probably your best bet... but just remember that LCDs look better in bright rooms, while Plasma goes better in darker ones. And they aren't as bulky as the old RPTVs, so you can hang them on your wall.

Eddie, me thinks you have hit it right on the button - just got through doing a thorough cleaning (not really much dust) & no change - I have a lot of hours on the set and have gone through 3 bulbs all with a extremely long lifetime where others have not been so lucky - I will have to live with it I guess until it really is unbearable and craps out & will have to start saving for a new one - appreciate very much your diagram and explanation - looks like CRT sets (if that's what the old picture tube ones are) last soooooooooooooo much longer than DLP's do - wonder if LCD ones last longer - opinion please

[alsie731]

Eddie - I know this is off subject but what you are saying is that plasmas show a better picture in a darker room set up (this is actually what I have) than a LCD one? Do plasmas last as long as a LCD one that say runs 10 hours a day 7 days a week - maybe I can give you some peace now

[alsie731]

Eddie; for some reason I did not realize the new picture you had added was there and that really explain everything in a way that even I can understand - and it is exactly the condition that I am in - Looks like it is a major job if it is possable to fix - I had searched high and low in the web for a answer to the problem with no avail & was lucky to find your site and you to help - hope others with the problem will find you - saw quite a few that had the same or similar problem while searching - again thanks

[ovadoggvo]

alsie731,
I have to tell you that one of your LCD prisms has deteriorated to a point where the heat from the lamp will continue to deteriorate the picture. I would purchase this light engine from discount-merchant.com:

http://www.discount-merchant.com/We-pro ... asonic.htm

That should fix your problem in an instant and have you up and runing like new. You may want to get a handy person to change it out for you. It is not that difficult but It does require someone with some experience in taking apart electronics.

It's only $259 for the whole light engine that from Panasonic would cost nearly $1000..

It's definately worth fixing in this economy.

[alsie731]

"WOW" what great pictures of the unit (light engine assembly) & am tempted to try it myself - it has to be the unit that the bulb shines into but it cannot be that simple to replace or in your opinion could it be? - wish it was just a couple of screws to remove and a slide out and in with the new one type job - just hope the Panny will continue being viewable for a reasonable time before I am forced to make a decision - part cost plus payment to a tech to fix versus a new set - being retired cannot get the toys as easy as before -

[SteveJones]

How long does it take for a job like this?

[wuzzletodd]

Hi , I am a 16+ yr TV tech, It takes about 2hrs for an exp tech to replace. Not hard to do, Just alot of things to take apart. Be VERRY careful when unplugging wires not to break off locking tabs,pull connectors off boards,or bending pins. First time, Then lable the wires and mark the connectors.I know this sounds stuped but, let me tell you how many of customers tried to repair their TV and got shocked...UNPLUG IT FIRST. And be gental,some screws may hold the light engine located in front of TV. Some fir into slots in the chassy. Pull up easy while pulling out. While you have it apart replace and filters and clean the dust out by usind a can of air."DO NOT turn can upside down"freezing cold will dammage some parts. If you smoke clean your TV at least once a month. Heat caused this problem.keeping your TV clean will prolong the life of your TV. Good luck, Todd

[wuzzletodd]

Also note, this Tv does NOT have a color wheel. It has 3 lcd panels. TV's that have 1 lcd panel use color wheels. Like Samsung.

[ovadoggvo]

alsie731,
The process is not hard, but as Todd says... be very carefull and take notes. It will take a standard person with no experience 3-4 hours to do... Take your time.. Don't attack it all at the same time as you may get tired and frustrated, which may cause you to rush through it. That's when problems occur.

If you have a digital camera, take pictures before you take out connectors and cables as Pictures are worth a thousand words when puting it back together.

I don't see anyone having problem replacing it. If you want difficult, try reparing a digital camera!

Good luck! Keep us posted.

[alsie731]

Just have been following suggestions as this thread goes along - #1 Setting aside a few bucks for a new set #2 Waiting for yellow spot to get bigger (and much to my amazement it has not) and happy & sad also that it is really livable still and has not put me in a position to jump either way - I know when the time comes I will order the part and give it a shot and try it myself - Also contemplating getting a bigger set to replacing it and moving the Panny to the den - If I wasn't retired and on a fixed income I would have gotton the 65" Plasma and ordered the part and given it a shot of doing it myself by now - my downside is that I've always lacked patience and rushed things but with instructions given me by you just might get me to try it ezactly as suggested - Really appreciate all advice given - At this point just waiting for something to happen to push me to do it

[timhannan]

I am getting on this a bit late as I see post is from 2009. I have a similar problem with my tv also. Interestling enough, I bought mine in Jan. of 2004 the same as the person that started this post. My problems started soon after I replaced the bulb for the fourth time. I cleaned the lense the light goes through with just a paper towel as it was very dusty and I felt the picture was not nearly as bright recently. Thought it might be the age of the bulb. Accidently ordered the wrong bulb ty-la1500 instead of the 1000. the company i bought it from sent me the correct wiring harness and both them and Panasonic said the wattage was the same. After talking with Panasonic tech support, they recommended me to an authorized repair center. I called them and they said that it could be a programming error and would cost about $100 to reset it. They said it could be the optical block but it is rare for them to fail in panasonics. He was talking about $600 for the new piece plus labor. i mentioned they cost from a discount supplier of about $250 and they said they would put it in if that was what it needed and labor would be about $80-100. somebody mentioned the light engine being the problem in an earlier post. Is that a different part? Is that the one more likely to break? Any comments are greatly appreciated. Thanks for the help. Tim

[CarlfUp]

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