magnavox tv

anthonybensonNovember 9, 2008

Hello I have a magnavox 54" big screen TV the color or brightness is so bad that you can only watch the TV at night. I would really like to make the repairs myself service charge the repair guy gave me was really outrageous. Please help thanks

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jdbillp

How old is the TV?

    Bookmark   November 10, 2008 at 8:37AM
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anthonybenson

Please forgive me on my last post i forgot the the model chassis # it is PTV745-AHOL

    Bookmark   November 10, 2008 at 4:45PM
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anthonybenson

The date stamp on the tv is 1996

    Bookmark   November 11, 2008 at 9:15PM
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anthonybenson

Can anybody help me out, Thanks

    Bookmark   November 18, 2008 at 3:51PM
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jdbillp

Are you a service tech?

    Bookmark   November 19, 2008 at 2:17PM
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kenmwatha

I have a 54" Magnavox PTV835 manufactured in 2000- I started having problems with it a few weeks ago when the picture would shrink to a fraction of the size of the screen and get so bright you could not make out the details- this would go away after leaving it on for several minutes-now it won't turn on at all-no picture-no sound-any ideas as to how I can fix this? I would appreciate any help I can get.

    Bookmark   November 19, 2008 at 7:26PM
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jdbillp

If you guys aren't tv service techs, with the proper test equipment and proper schematics, the idea of fixing it yourself is a pipedream.

    Bookmark   November 19, 2008 at 11:51PM
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rockstar90

It could be the CRT Coolant is bad thats what could cause dark picture and bad color but i wouldn't recommend you changing it your self cause you could mess up the alinement of the three crt guns. Magnavox and philips have that problem of crt coolant growing algae in the coolant. Thats what happen to mine but after i replaced the coolant the picture was perfect.

    Bookmark   November 21, 2008 at 11:15AM
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anthonybenson

I'm not a service tech, but I'm pretty good at working on electronic item If can find out how to get the coolant and instruction on how to install the coolant in the CRT, I think I will be fine. So, where can I find the coolant and instruction. I try to fix before I have to throw it away. Television expensive these days. Thanks

    Bookmark   November 26, 2008 at 7:17PM
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rockstar90

You can get the coolant from here http://www.mcmelectronics.com/product/20-4275

This is what i read on changing coolant,
I suggest doing 1 tube at a time so you won't have to do a major re-convergence adjustment also mark things before you remove something. Remove the green crt first. remove the high voltage lead from the splitter, then the yoke and convergence plugs then the ground wires going from the crt ground strap to the crt board.Lay the assembly down with the drain plug facing up( you will have to support the crt neck with a block of wood)I use a turkey baster with a plastic straw taped to the end. Remove the drain plug and suck out the coolant and empty into a plastic container.I use an old milk carton. When most of the coolant is removed remove the lens assembly. Then remove the half moon shaped plastic from the reservoir . suck out the remaining cooland and use a paper towel to sop up the remaining debris. You can also use rubbing alcohol to clean out the coolant fluid to kill off bacteria. Reinstall the half moon and lens. Fill the reservoir allowing a little room for expansion.Reinstall the tube then doing the customer convergence meaning line the tube you just worked on backup with the other tubes convergence. Do the blue and red tube the same way. good luck

    Bookmark   December 4, 2008 at 9:49AM
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anthonybenson

Thanks, I will order the crt coolant tomorrow. Hopefully by next week I will be up and running watching football. I will keep you posted on my progress. Again Thanks

    Bookmark   December 5, 2008 at 11:43PM
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