I have had my 60" philips magnavox for 7 years and I think the picture tube is going out. The screen gradully got darker and less clear. I have tried increasing the brightness but this does not help but just a little. CAN I FIX IT MYSELF?? How technical of a job is it to replace the picture tube and how much will it probably cost???
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If this is an older rear projection TV as the model number indicates, you can unplug and remove back cover.
Inside you will see three large round black lens---these are for the 3 picture tubes: Clean all the dust and dirt off of them with either a lens cloth or a paper towel with glass cleaner sprayed on the towel.
The lens are the light source for your picture and if dusty the picture will gradually become darker and some what blurry looking.
the projection tubes do wear out over time and there is no fix but to replace them. you might first check to make sure the lenses and mirror are clean, do not use compressed air to clean as you may force dust between the lenses. if the picture is darker at the edges or a different hue then the coolant is likely contaminated and needs changed
The curving is caused by bad digital convergencr chips (2) located on large signal board. They need replaced along with blown pico fuses and the convergence resistors. Chips are huge compared to a regular IC. 2" x 1.5" and they will be bolted on fairly large heatsinks. Cloudy picture is most likely the coolant needs replaced in the picture tubes. This needs to be done approximately every 5 years.
The most likely cause is the blue and green tubes need to have the cooling fluid changed. After many years the blue and green get clouded with algae. The red tube won't have the problem due to the red spectrum kills the algae before it has time to grow.
The way to replace the fluid for is to completely remove each CRT from the set, remove the drain plug, drain the fluid out the tube, disassemble the lens, give it a good cleaning; then reassemble; add fluid; and reinstall in set. If you check with the site www.TvRepairKits.com they are working on a kit that includes the fluid and photo instruction guide.
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. http://servicemanuals.vstore.ca/
You can also check to see if you have bad fluid problems, by looking
down in your crt's with a flashlight when you unplug your set and see
if you can notice any particles that should not be there. Look at all
three and see if there is a difference. It should be clear, if not then
you need to change fluid and clean. It sounds as if one of the picture elements (there are probably 3 for
R-red G-green B-blue) has gone bad and it is most likely the green one.
Sad to say it will probably cost you more to have it fixed than it
would to buy a new TV. Most places will not even look at a TV for less
than $85 or so, then they will add parts and labor... if they can even