Question about Philips Magnavox 20MT133S 20" TV

4 Answers

Top ~1¼" of the picture being overscanned into top ~½"

The top ~1¼" of the picture appears to be overscanned into top ~½" leaving the top 1¼" of the screen empty (black). In effect, it appears that what is supposed to appear in the top 1¼" of the screen is being jammed into the top ½" of the picture.

That makes it really tough when watching an NFL game on Fox with the game details posted in a bar along the top. :-)

There is only one unmarked adjustment port on the reay of this set.

Thank in advance for any help in correcting this issue.

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  • 2 more comments 
  • M1952 Sep 11, 2008

    I am comfortable with electronics soldiering and the only thing in that realm that I hope I never have to do again is adding/replacing any of those teeny-tiny SMCs ... . I did that on a couple of old mini-laptops and vidcards in order to OC them. I don't foresee any issues (de)soldering capacitors.



    While I have never modded anything inside a TV set, I figure it shouldn't be fundamentally different from the computer mods that I have done over the years ... I will just be careful to avoid the components that may zap me ... like BIG caps. :-)



    I look forward to your instructions. Thanks so much for your help, Dan!



    Kim

  • M1952 Sep 18, 2008

    Dan?

  • M1952 Sep 19, 2008

    Hmmm ... I thought that Dan would return to tell me on which board the vertical circuit lives and how to ID the bad capacitor.



    Now I am told that there are several things that it can be.



    I suppose that the next best step for me is to haul that TV off of the fridge tomorrow morning, open 'er up and look for one or more obviously toasted components ... and take a LOT of digipics for later reference before I put it back together and return it to the fridge.





  • M1952 Sep 21, 2008

    I cracked the case and immediately saw a hotspot on the PCB ... so I took some pics & readings before returning the TV to its home atop the fridge.

    Here are some pics:
    http://i7.photobucket.com/albums/y285/Ju...
    http://i7.photobucket.com/albums/y285/Ju...
    http://i7.photobucket.com/albums/y285/Ju...
    http://i7.photobucket.com/albums/y285/Ju...

    The hotspot seems to be generally centered on 3 axial resistors (PCB#s 3423, 3443, 3444). As a quick volt-ohmmeter check I read the easily accessible big, horizontal axial resistor in the pic (by the Molex) and it reads correctly as 33ohms.

    The two closest edge of the board (3443, 3444) only read ~1.2ohms which cannot be correct. They appear to be IDed as 210ohm (red/brn?/brn?) but their striping is a bit odd and I never was good at reading the stripe colors on the small ones, especially when their surface is not flat & glossy.

    The third one in question (3423) reads ~35ohm but its striping is Blu/Gry?/Blk which indicates that it is a 68ohm resistor. Even if I am off on the second stripe color, the BLUE is obvious, so this should be a Sixty-something ohm resistor.

    It appears that these 3 resistors, at least, need to be replaced. Anyone have a schematic for this TV that would give me the specifics on these 3 resistors?

    I am also soliciting any other thoughts from you experts. This is my first TV repair and I am not going to assume that replacing these three resistors will correct my problem, although it looks like an excellent place to start. ;-)

    Thanks!

    Kim

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4 Answers

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  • 4,234 Answers

First, my apologoes for the delay. I was called out on site for a major production and my access here has been limited. I do have the service manual for this set and intend to look up the pffending circuit tonight. I have listed the items you provided as target components for checking and will post the relevant parts of the vertical circuit.

Dan

Posted on Sep 22, 2008

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Https://www.manualsparadise.com/ShowProductsForModel.do?model=M39589528\
You can purchase the service manual from the above link. That will give you all the info you need. If you have a moment please accept and rate this solution accordingly as I strive to provide fast, economical, and accurate solutions.
Thanks and enjoy,
Lee

Posted on Sep 21, 2008

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Try to reset first if nothing happens we proceed another solution;

Resetting the TV

Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can saved time.
1. Unplug the TV power cord from the power outlet for 3 - 4 hours.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.

hope this may help;

Regards,
VOTIT

Posted on Sep 19, 2008

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  • 497 Answers

A missing power supply voltage, defective vertical output IC, or a component associated with it is likely bad. A bad connection or blown fusable resistor may be the cause of a missing power supply voltage

Thanks for using Fixya!
tc

Posted on Sep 19, 2008

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Overscanned in the top of the screen,is the symptom defected capacitor in the vertical section. Filter capacitor 100uf or microfarad or it is better you replaced all capacitor there and reworks or resolder all solder joint there in vertical section.So it will works better again..

Regards,.
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