Color fade It seems the yellow in the picture has faded, possibly the "colors" in general. Is their a replacement part?

Does it come and go? Or is it like this all the time? If you bump the side of the TV does it change the symptoms? Thanks Lou

Hello
The color of HP LJ 2600n fades due to following reasons
1. the color cartridge near to empty 2. due to dust on reflection mirrors inside the printer
if the color cartridges are OK, then you need help of HP technician support, because cleaning of mirrors is very technical in nature for 2600n.
Dusty Environments can lead to Laser Scanner Contamination. The dust layer on the mirrors prevents proper transmission of the laser output in the imaging system leading to faded colors on the printed page. The initial stages of this failure typically occur in the magenta or yellow color planes as faded or light color. Often the left side is more faded than the middle.
You may need to contact the nearest Authorized Service Tech and get teh Laser Scanner replaced with the new released service part that has a mirror in a location where the dust ideally cannot reach easily.
Also, please ensure that the printer is relocated from the current location to a more dust free zone.
Hope this helps, if so do rate the solution

Apparently you might need to because scanners are most times not reserviceablw when problems of faded output and discolouration is evident.

Properly clean the surface of the scanner and leave your scanning image application to default settings

sounds like your color wheel is fading.

Likely the picture tubes are getting weak from old age. Not much you can do about this.

the most likely cause is the coolant needs to be replaced in the CRTs. Very common problem. You can get the Phillips CRT coolant kit at the following link which contains the coolant and step by step instructions. Its listed under the repair kit category.
http://servicemanuals.vstore.ca/

What you are describing is a bad print head. You can try running the eliminate light stripes several times, and jet substitution, but most likely the print head will have to be replaced to remedy your problem.
You can try googling. Phaser printer print heads or phaser printheads.
There seems to be a secondary market appearing for those print heads. I can tell you from Xerox, if you have no maintenance agreement, they cost $750 per print head.
Honestly, having worked on about every type of color printer known to man, the new solid ink phaser printers, produce a dry ink image of 2400 x 2400 dpi with ink particles that align end to end. The resolution of those printers are remarkable and can be purchased for less than the price of one of those new print heads.
Now for reliable, albeit somewhat not as sharp a color image, but still exceptional, you really can not beat an HP.
The ink stick technology really no longer has the color vividness advantage it initially had. The inks that align end to end, have ended that advantage and are sure a lot cheaper to operate per page.

Sounds like your coolant in the tubes need to be repalced. This is a common problem as the set gets older. Check with www.TvRepairKits.com for the supplies and instruction guide. 

There are a few possible causes for this

-Picture tube has become weak after long useage
-A fault with the automatic degauss circuit could be causing the color problems.
-The color drive circuits may be out of adjustment.

I don't have instructions for you on how to fix this, I would recommend you either buy premium assistance or contact
another expert with long tv experience to possibly get details
on how to correct this problem.

I would recommend you contact your dealer for repairs if you have warranty. If you don't have warranty it may be cheaper to ask around.

I think you are on the right track with the drum unit.