Question about Panasonic PT-51HX40 51" Rear Projection Television

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Picture is getting darker and darker

I've had my TV for 6 years and 2 months and have enjoyed it a great deal. I've just noticed (in the last month) that the picture is dark. I've adjusted the contrast, color and brighnss, with no luck. The tv has not been moved outside of this room. Thank you so much for any ideas. A tv man today told me just buy a new one, there is no way to repair it.

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Re: Picture is getting darker and darker

If the tv has never been service before you could have dust on the 3 tubes,this will decrease the brightness to the screen. try taking the front or back off & see if you can see the top of the picture tubes. remember to unplug the tv & to clean spray the cleaner on the colth , then clean the tup of the tube. never spary on the tube itself. hope this works for you.

Posted on Nov 04, 2006

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Our LG tv has started making a vibrating whistling sound when you first cut it on, you can hear it get faster and faster then slowly goes away.. Also over the past few months I've notices the picture

the picture getting darker means the lamp has aged and u need to replace it another thing u need ti replace the mirrors in the light tunnel of the light engine they have faded secondly the noise means the colour wheel has aged you need to replace it u will have to replace the whole light engine cos the color wheel comes inbuilt the light engine and u will be ok ontact lg dealer in your area

Jul 19, 2013 | Projection Televisions

1 Answer

Screen getting dark

If you have never changed the lamp this is more than likely the issue, as the tv ages the lamp looses brightness. Most lamps are rated for 3000-5000 hrs of use. Replace the lamp assembly part # UX21514 and you will notice a much brighter picture. You do not mention if the tv plays the right colors on the entire screen. These have had light engine issues.
Good luck with it

Apr 07, 2009 | Hitachi 50VX915 Rear Projection Television

1 Answer

Darker picture

Clean the lenes inside of the TV and the mirror and screen (a little dust build up on these three things adds up quick!) also if you smoke that can build up too! these tvs have too be cleaned inside

Nov 28, 2008 | Hitachi 57F500 57" Rear Projection...

1 Answer

Color fading in picture

you need to replace the coolant in thr CRTs( picture tubes) Vert common problem in phillips. You can get the enitre repair kit at the following link which has the coolant and instruction CD for phillips coolanrt change. Heres the link its under the repair kit section.

Jul 21, 2008 | Philips Magnavox 9P6034C 60" Rear...

2 Answers

Picture getting darker

The tv has a room light sensor,
shine a bright light at it , does picture get brighter?
other wise when it is cool open the bulb door , is it coated or blackened, Don't touch bulb at all.

and a heavy covering of dust on internal mirrors will cause the same effect.
you will need help to clean it.

Jan 26, 2008 | Sony Grand WEGA KDF-55WF655 36" Rear...

1 Answer


Your CRT coolant needs to be changed. Thats whats giving you the dim picture. You can also clean the projection mirror on the inside this often helps. But the coolant will need to be changed to get back the bright crisp picture. Hope this helps.

Jan 20, 2008 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

No picture

I hope youre lucky enough for that to be the only time, but mine has been doing this for over a year, getting progressively worse. As of the last 2 days, it has to sit over night b4 it will show an image again. Good luck with this B.S. tv. (Just spent $250 on new bulb last month too, had set 2 yrs. )

May 20, 2007 | Zenith E44W46LCD 44" Rear Projection...

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