Question about Philips Magnavox 51MP392H Rear Projection Television

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Picture tube fluid

Im in my second year of consumer electronics & we dont get alot of projection tvs to work on but my tv at home needs fluid & if you could tell me how I can do it myself.

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Re: picture tube fluid

Magnavox are good at fluid breaking down especially blue and sometimes red. Yes you would have to be very carefull not to waste on boards, because of set CRT's are tilt this mean when you open it will start to leak. The best bet if you are willing to try yourself is to prop up set somehow to make crt's level and when you take lense off you can look underneath and open the bottom lense cover up and expose the old crt fluid and then you will need some type of suction pump to suck out the old fluid. Once you have old fluid out then you can clean inside crt and make sure you clean good. Then replace with new fluid and go in reverse and clean all that touches crt. Hope this helps!

Posted on Sep 17, 2007

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I have an LG 65 inch TV. Owned it about a year and a half. While watching it the picture will go off for a second or two. It happens every few minutes. What is the problem?. The sound stays on.

make this test and fix it. God bless you

The Basics

Before we explore more complex tv troubleshooting techniques, we need to examine the basics. First, we need to verify the TV is securely plugged into a power outlet. Don't laugh, but failure to plug-in the TV is the number one reason reported why electronics do not work. Second, you need to verify the remote has fresh batteries. This can easily be overlooked. The remote can be working one minute and not working the next, so replace the batteries Finally, verify that all cables and connections are correctly and securely attached.

Lamp Problems

Rear-Projection TVs have a lamp, which picks up the picture and projects it on the TV screen. A burned-out or connected lamps are two of the most common problems for Rear-Projection TVs. First, you will want to confirm the bulb is still good. If the bulb is bad then then replace it immediately. Second consult your user manual and verify the lamp and lamp cover are installed properly. Most Rear-Projection TVs have warning light which notify you when there are lamp problems. Again consult the user's manual to see what each light means.


Temperature is a common reason why many Rear-projection TVs do not perform well when they get to hot. You may start to see your TV shutting down automatically when it overheats. Here are a couple of things you can do to prevent overheating. First make certain any TV ventilation ports are free and clear of debris and dust. Second make sure the TV has enough room for airflow. Third, the temperature in the room should be around 72 degrees. Due to the high degree of heat generated by a rear-projection TVs, it is not advisable to watch TV on a hot days when you don't run the air condition. This could cause damage to your TV.

Configuration Problems

Improperly configuring TV setting can cause problems. Verify the TV settings are set correctly. First, brightness and contrast should not be set to high or to low because this can cause poor picture images. Second, adjust the color on the TV when the picture displays colors poorly. Third, if you are having sound issues then check to make sure the volume is not muted or turn down all the way.

Nov 04, 2013 | Projection Televisions

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I have a hitachi 54' projection tv model num.57SWX20B i purchased about 8 years ago brand new. when turned on operayes fine for about 5 mins. then i lose my picture to multicolored lines after a couple...

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.


69189a5.pngSOLUTION #1

For more more examples and find a fix using this link on Fixya

Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

TV set after fluid change



You can see some more examples and find a fix using this link on Fixya

Apr 20, 2011 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

I have just put$600.00 into this TV. I had it home 2 days and it is still messed up. The repairman now tells me that I need 3 picture tubes, and they are $175.00a piece. Is there somewhere I can buy these...

You don't need to replace the tubes you need to replace the Fluid in the lens that are on top of the projection tube contact me at for more help on changing the fluid on this set

Big Screen TV & Electronic Repair Charles Smith  4351 Sea Horse Ave. North Port, Fl  34286  Call (941) 961-9649 Today!!!!

Mar 20, 2011 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

I have a PTV916 Model # 60P8341A. I cleaned the lenses and the mirror inside the TV however, I can see alot of dust inside the actual lens. Is it possible to clean the inside of the lenses?

ll projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.

CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

TV set after fluid change



You can see some more examples and find a fix using this link on Fixya

Jan 13, 2011 | Philips 50P8341 50" Rear Projection...

2 Answers

Screen gets red tint then tv turns off

I had the same problem with mine. After A LOT of research, I never found a good solution, except that strange things seem to happen when TVs get too hot. On my Sony, there is a solid panel behind the cloth-covered lower front panel. I removed the solid panel and drilled a series of holes in it to allow more air circulation around the projection tubes. This seems to have corrected the problem, at least for the time being.

Oct 05, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Blue screen

It sounds like the cooling fluid in your picture tube(s) has become dicolored - this can be seen if you dismantel the unit and view the picture tubes directly - they will appear foggy - replacing the fluid can be a time consumming and expencive task.

Sep 18, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

What next?

Check your tubes look to see if any of projection fluid is leaking,or if any has leaked onto chassis,alot of these tvs also had problem with that, also recheck second ribbon connection make sure it is in good ,they had trouble with ribbons and the connector plugs.

Dec 19, 2008 | RCA HD52W59 HDTV Projection Television

1 Answer

Toshiba 50A61 Horizontal Lines in picture

You have bad connections somewere need to look further for sure

Nov 08, 2008 | Toshiba 50A61 50" Rear Projection...

1 Answer


Good Day;
It sounds like the CRT COOLANT needs replacement, it is a fluid that trys too keep the picture tubes cool , but it some times get "dirty". The fluid is called 'PROJECTION TV COOLANT', it contains; High Concentration of Ethylene Glycol. You can purchase at M.A.T. Electronics; (215) 354-7667, in PA. Part Number 212072-16.
BUY at least 2 containers. CAUTION: remove tubes from TV, just alot of plugs,remove plugs, clean "fluid" chamber, replced discarted fluid. Good Luck, big IRISH. PS more INFO; come back.

Mar 28, 2008 | Hitachi 53FDX01B 53" Rear Projection...

1 Answer

Loud pop, and no more picture???

I don't know if this will you but I just experienced a similiar problem with a sony kp-53s35.
It turns out that a fluid leaked out of a rubber boot on one of the guns( I have no idea what the fluid is or why it is corrosive), down to a circuit board and started to desolve a jumper wire. when it had eaten away enough of the wire, the residue or solution was conductive enough to cause an arc to a ground bus bar that ran along the circuit board. The TV still worked but would crack and pop like firecrackers inside.
I was able to increase the distance to the ground source by bending the bar away. Then I scraped and scrubbed the board with contact cleaner to remove residue and replaced jumper wire.
Has worked fine since.

Dec 28, 2007 | Sony KP-53S35 53" Rear Projection...

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