Question about Philips Magnavox 51MP392H Rear Projection Television

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TV no-picture Turn it on and just a click. I hear crackling. Removed the back and see acrhing in the end of the middle tube. The other two glow. I can see the arching inside end of the tube. Bad Tube? Want to know cost to see if this thing is trash or not. Thanks

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Hello cooperjason,

You may have a short between the grid and the cathode of one of your tubes. This is repairable if you happen to have a CRT tester. It can remove the short and allow you to balance the three tubes once you have repaired the problem. There is information on the web about how you can clear the grid / cathode short by using a charged capacitor across the grid and cathode pins of the CRT.

I would suggest, though, that you get a qualified TV repair person to do the work on this TV. Since the voltages involved are rather dangerous.


I hope this helps,

Thank you
Shuttle83

Posted on Sep 14, 2008

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I have a zenith projection tv model r56w36. It won't stay on. When I remove the back panel and turn it on, I see a bright flash coming from the middle bulb on the right side of it where It looks


better be very careful here, if a pop or flash near one of the three crts or picture tubes there is serious voltage there.

the tubes each have a sealed wire delivering at least ten thousand volts to each tube===I have heard this before. likely what you have now is the seal they place where the wire enters the tube (2nd Anode) is arcing.

tube has to be removed to get at and reseal that--not a beginner or doit yourself job.

Note: if you keep turning it on sooner or later it will destroy other parts.

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You should not adjust those knobs...Turn them back down - the ones marked "screen"...then power up and turn them up again slowly...if you go too far they will shut off again.

Once you get the tubes back on again as normal you can fix the original issue for dull video.

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Picture of a set that needs the fluid changed.

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TV set after fluid change

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You can get the correct parts, step by step photo instruction guides, and support from www.TvRepairKits.com or click here

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Whoever seabelow is, doesn't know about tv repair. You have a projection tv with 3 picture tubes. It doesn't have a color wheel. Maybe he is a tv salesman needing commission. Anyhow your tv has a major problem. The sqreeching noise you hear is probably a picture tube arcing. What happens is connections on the circuit board break free and the high voltage goes too high causing the tube to fail and spark. If you want to confirm this you can remove the rear cover which uses star type screws. Then remove the 6-8 screws from each side by speakers. Pop off front cover and remove small door in middle of set. Get extension cord and stay back from set. When you plug it in and apply power you will see which tube is arcing. Unfortunately, if this is a correct diagnosis, you will probably end up replacing the set unless you find a used picture tube to replace the bad one. Even then you still need repair to the deflectoin pcb. This is about a 400.00 repair. Sorry for the bad news but I though you at least deserved a compitent response. Good luck, Russmann.

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1 Answer

Crackling noise on tv


Hi,do you hear any strange noises? If you hear clicking or like wanting to turn on it could be the board that powers the lamp it's called the ballast.When it's not able to provide power to the lamp it will flicker,cause the tv to shut on and off .You will need to replace it.Price varies from $40.00 up to $100.00 This procedure is fast and easy.Have a bless one!


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1 Answer

TV made a big popping sound, and then a crackling


Hi,do you hear any strange noises? If you hear clicking or like wanting to turn on it could be the board that powers the lamp it's called the ballast.Here's the instructions to replace it :http://www.fixyourdlp.com/guides/samsung/bp47-00033a.php That crackling sound could be of the color wheel:The color wheel is a rotating disc that has a gamma of colors it spins at high rpms.The light of the lamp goes through it to create the colors on your tv.When it starts to go bad you will get color distortion ,black and white picture and sometimes you will hear humming noises. But if you don't hear any strange noises,tv is around 6000 hrs,2-4 yrs it could be time to replace the lamp.The lamp you need is BP9601073A you can find original here:http://www.discount-merchant.com/Samsung-BP96-01073A-lamp-p/samsung-bp96-01073a-lamp-oem.htm?Click=48173 .Have a blessed one!

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1 Answer

Turns on but no picture


It appears that one of the CRTs has a short in it. It can be repaired with a CRT tester or with a capacitor charged up and applied to the grid and cathode pins of the CRT having the problem.

I would advise that you have a qualified TV repair Technician do this.

Thank you,

Shuttle83

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I just bought a used 60 inch rear projection tv. The picture is fine except I have a crackling sound coming from the front of the tv also. What's the deal?

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Screen went black, no picture


A clue to what is wrong is by looking from the back (taking the back off) and looking to see if the three picture tubes have any yellow glow at the bottom of them where the three identical boards are located on each tube.. If you have no glow there you possibly have a resistor R4703 open. It is a 3.3 ohm resistor and feeds the voltage to the filaments in each tube where the glow is suppose to be. If you do have the glow the problem could be much more complicated. Another to check is to see if the menu comes up on the screen. You could possibly be in the wrong input mode, Check your input mode with the input button on the remote The number R4703 is a location number to identify where the resistor is. This is all I can tell you that would not require much more complicated procedures requiring a tv repairman to look at it. If you have an ohm meter you can check R4703 but it must be checked out of circuit. (or at least one leg loose) Hope this helps

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