Question about Philips Magnavox 51MP392H Rear Projection Television

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Blank screen and chirping

The front LED comes on and mine beeps. I just fixed the convergence on mine and it was working fine. When I unplugged the eft board with the convergence IC's on it the bulbs came back on, but of coarse there was no picture. I took that board out and for some reason it was wet. I cleaned it with alcohol after changing the IC's and resistors. That was hours before I put the board back in though, and I made sure it was dry. Is this some sort of leakage from the IC's? What is this new problem all about?

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HI,
I THINK ONE OR MORE TUBES ARE GONE.CHECK TUBES FOR CRACKES UNDER YOKE,THANKS.

Posted on Jun 04, 2008

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Posted on Jan 02, 2017

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No picture, only beeps..philips 37pfl


The chirp or beep is a indication of a short on a line with fairly high voltage, over in most cases 100 volts DC.

Time to decide if you want to fix it (I would not as boards are rather expensive for this brand) by having a shop look at it OR retire/recycle it---average life on these sets (any brand) is about 4 years.

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Screen is scrambled. Working fine until I unpluged the TV one day. Is it a fuse?


If it looks 3d or warped its a convergence problem

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 images of convergence problems.


7859b01.jpg

e87380c.jpg
69189a5.pngSOLUTION #1

For more more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Or goto the site www.TvRepairKits.com for the parts and instructions on how to fix it yourself

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48 jvc


Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
5f6e85c.jpg
Problem #2 CRT Fluid has clouded over.

Symptoms


  • Dull Video, Washed out
  • White/Bright looking video
  • Halos around objects
  • Red/Orange looking
Example Photo:
ee1ca68.jpg

You can see more examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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2 Answers

Phillips chirping


two STK392-120 convergence modules that usually cause the beeping. So I changed them both again, but I also found two open 7.5 ohm resistors are in the general area of the convergence modules, and I replaced them as well. I also replace 1 swollen capacitor that was probably going to blow in the future but not really a problem yet.
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
Sony Convergence
http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/
http://www.techlore.com/article/19631/Sony-Convergence-Procedure/

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1 Answer

Zenith iqc50h95 50 in rear proj


Rainman, can`t really be of any great help on this one, both techs can be right, the chirp is exactly as you thought, the set is trying to come on but there is a short in the set and it`s shutting down because of the short, could be convergence, low voltage power supply, high voltage power supply, until a tech gets in there and starts un-loading circuits it`s impossible to say where the short is, gonna have to call someone out for this one, good luck with it, BMW Rider

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1 Answer

When tv turned screen is blank and chirping sound comes from back


A chirping sound usually means that one of the secondary supplies has shorted, most likely the horizontal output transistor. The power supply "chirps", which is the sound it makes when it protects itself from drawing too much current. The set should be serviced by someone with experience in Philips projection TV'.

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