Question about Philips Magnavox 51MP392H Rear Projection Television

2 Answers

Phillips/mag PVT-810 8P6044

For a past couple of nights recently, the picture would start to "Shake", I guess is a good description. then once or twice, the picture would sort of
"Wink" out, but then reapear w/ no further issues. Then on occasion
would shut down after this. After letting it set for a couple mins,
turn it on and it would be ok the rest of the night. I thought maybe
loose/cold solder joint some where, because it seemed to come back
after tapping wiggling board sometimes, but what do I know.
Well I had it on this morning for a bit, worked ok, had to go do some
things in town, and shut it off. Come back today and all it will do
now is power up for about 3 seconds, then shut down w/ a real faint
sort of instantaneous "Squeak" sound (luv my descriptions so far???...lol)
This is all it will do now. I got the HV/Vert def board out on bench
lookin @ it now, but not even sure if its on this one or other board.
Was hoping theres a small case history of this issue or if anybody has
an idea on what to check 1st. horizantol output (D2539) seems ok (Q802)
but then again i ask...what do I know.
Well after replacing that diode anyways, i connected back up, now tv
will power on, but no HV, 15watt 30 ohm resistor (R938) near FBT, cold
as a stone, theres another on other side of FBT (R980) that gets
warm/hot. Had a retired TV guy over here last night, but he was a
bull...burnt up a trace/pad tryin to remove a diff diode that was good
anyway's, bitchin/moanin bout not havin service manual,etc..then he
broke the tip of my 100w gun. Hence why I rather do these things myself.
I repaired the damage and put it back together to see what the state of
the union was. Like I said, set powers on now, have audio, but no
HV...vertical looks to be there...I'm afraid I'm lost unless anyone
there has a schematic for this Mag/phil
(That is if anybody is reading this babble)
thanks again

Mark G

Posted by on

  • Max G
    Max G Jul 07, 2008

    between this helpful post, and the service manual i found this morning, I have faith, yes!!
    thank you kind sir


  • Max G
    Max G Jul 07, 2008

    yes old fart here also, 46 on thursday
    tv is 1998 model
    was thrown out in trash because of blue and green crt cataracts, which I've already taken care of.
    picture is sweet and crisp for a rear projection, hence worth trying to repair.
    thanx again!!
    e-mail me if ya want manual for this particular model


×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Philips Master
  • 3,459 Answers

If the video is shrinking and expanding then its likely the opto chip is doa. Its a common problem on the older sets. Check with www.magnavoxhelp.com and see if they have a chip kit for your model.

Posted on Sep 13, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Philips Master
  • 5,568 Answers

Jeez, you ramble on as bad as I do (must be another old fart).
It sounds like you know enough to be dangerous.

Getting service literature is not likely, BTW, Sam's Photofacts is not keeping pace with the proliferation of models, brands and re-branding.

Your first description does sound like a cold or fractured solder joint.
If you've had the board out, do it again and inspect the HV area with magnification for solder joints that look cracked.

You didn't mention how old the box is and if it was built in the 2003-2006 period, you may be a late victim of millions of capacitors which failed because of counterfeit and defective electrolytic solution.
Sorting out the good and bad caps needs patience and a cap meter with DF (losses) feature.

Locate the main power supply transformer; it will be about 4 cubic inches and the core will appear smooth (ferrite).

Check the diodes you can identify near that transfomer, you may have to lift one end of some of them since the ohms (or diode) reading you see may have a low-resistance winding parallel and a low resistance load to ground.

It sounds like the PS output for the HV circuit has failed but that may be a symptom of the problem, not the origin.

You've checked the horizontal output transistor (2S)D2539 but made no comment about what you found.
This type has an internal damper diode that can make it look bad if you aren't familiar with it.
Two of the three leads should be desoldered and centered in their mountng hole so they are not contacting.

Pinout is here:

http://www.nteinc.com/specs/2300to2399/pdf/nte2353.pdf

(This is for a replacement type of the same ratings.)

Checking from E to C; with the positive on the collector, the negative on the emitter, it should measure quite high, maybe infinite is all is well.
Reversing the leads will probably show a typical diode drop of something less than a volt (the diode function is supplying current but measuring and displaying a voltage drop of ~ 0 to 2000 millivolts).
The base to emitter and base to collector MAY show values quite close to each other, hundreds of millivolts when the positive (it's an NPN type) is placed on the base and the negative on the other two - separately of course!

Good luck-

Posted on Jul 05, 2008

  • Steve Allison
    Steve Allison Jul 07, 2008

    > e-mail me if ya want manual for this particular model

    Hmm, no email address in your profile but maybe Fixya will zap one to you.



    Thanks for the offer but I am not actively doing service any more and I have enough unused 'stuff' in my 'Technical' folder.

    You might post the link for the manual in a return comment so that others can save some time.

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Black screen


It is likely that you now have power supply trouble.

May 26, 2013 | Philips Projection Televisions

1 Answer

Phillips 55" rear projection HD ready --power button lights up, but no picture or sound--just a clicking noise. Also, we can no longer adjust the blue convergence. The adjustment screen comes up, but we...


Got our tv in 2004 and we're having the exact same problem. When the blue convergence started going a couple months ago my husband researched the heck out of it and decided it would cost less to just replace the tv with a newer, nicer model rather than repair it. And now, as of last night, we are having the same power issue where the power button goes on, but won't stay on. It just clicks on and off and no sound or picture. Did you ever get yours fixed, or did you end up replacing?

Oct 15, 2010 | Philips 55PP9352 55" Projection Television

1 Answer

IC Chip?


Its a common problem with this model. Goto www.TvRepairKits.com to get the parts and instructions to fix the TV.

Sep 06, 2009 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

TV made a buzzing noise then turned off. Now power light flashes


You have a very Technical problem with this TV. you may have 2 big problems, ballast and dmd. but it could be something else. If you decide to repair it, honestly you will spend more than 300dlls on it, if you like to, go to fixyourdlp.com

Sep 03, 2009 | Samsung Projection Televisions

2 Answers

RCA d52w20b picture shaking and "hissing" sound.


The grey components are Box capacitors chances are the 0047 2KV box capacitor in front of that heat sink is whats shorted out, very common problem for your model.

Aug 08, 2009 | Projection Televisions

1 Answer

Picture stretching with Red, Green, and Blue Image Overlays


assuming that you have adjusted the convergence and this had no effect. you might have some blown convergence chips and/or resistors. these make the 3 color line up with each other.. my 55 in phillips did the same thing and the more i used it the worst it got. first it was the blue and the red and finally the green., replaced chips and resistors and the problem went away... good luck.. a lot of soldering involved. but the chips are only like 11.00 each and the resistors are like ten for all three.

May 30, 2009 | Sony KP-43HT20 43" Rear Projection...

1 Answer

52mp392 h/17 Sound but no picture


If heat sinks on hori/and convergence are running warm then it means sweep is working ,You have a bad Flyback transfomer HVG part number 3122 268 32942 Phillips FBT

Dec 18, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Picture color - it is a blue and green picture- no other color- looks artificial


update your tv with a usb drive. worked on my phillips 60PP9200D/37. get update at phillips web site. solves many problems

Jan 18, 2008 | Philips 60PP9200D Television

Not finding what you are looking for?
Philips Magnavox 51MP392H Rear Projection Television Logo

159 people viewed this question

Ask a Question

Usually answered in minutes!

Top Philips Projection Televisions Experts

matt martin
matt martin

Level 3 Expert

1191 Answers

Jaime Hernandez

Level 3 Expert

2267 Answers

The Knight
The Knight

Level 3 Expert

68157 Answers

Are you a Philips Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...