Question about Mitsubishi VS-50607 50" Rear Projection Television

9 Answers

Vertical roll ...........starts when system is turned-on. Picture quality is great.........just unable to stop roll or adjust adjust vertical size

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  • saintmatt6 Mar 12, 2009

    Did as suggested with negative results. Still with same problem

  • saintmatt6 Mar 13, 2009

    Did as suggested. No difference noted.

  • saintmatt6 Mar 13, 2009

    I'm a retired police officer/CET. Formerly repaired and installed communications equipment for DC Police and the Uniformed Division of the Secret Service. Is there a manual/schematic for this unit available anywhere other than the Library of Congress???

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9 Answers

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  • Mitsubishi Master
  • 19,396 Answers

If you are using aerial reception, and the vertical roll is not on when watching DVDs , then just use a signal booster like this one, Motorola Signal Booster 1-Port BDA-S1 ..., that will stop vertical roll.

Posted on Mar 15, 2009

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  • Master
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The rolling is caused by a distortion in the video signal somewhere in the signal path. This can be caused by a defective PIP board. These are known to have problems with surface mounted capacitors. There is a "repair kit" available for this from MATELECTONICS.COM for about $14. If you can solder surface mounted capacitors, you should be able to resolve this yourself. Try installing the repair kit onto the PIP board and update this if the problem is not resolved. Please note that ALL video signals pass through the PIP module whether or not PIP is activated.

Dan

Posted on Mar 14, 2009

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  • Master
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Hi there.
The TV may just have to be reset, you will find the reset button on the left hand side of the TV's control panel, you may have to use a paperclip to push the button.

Good luck and thanks for using FixYa!!

Posted on Mar 13, 2009

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  • Master
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Here are my two suggestions:

ONE: Do a hard reset. Maybe twice. Unplug the power cord and leave unplugged for 4 hours or overnight.

TWO: Give it the whacking test. This will tell you if you have loose connections or cold solder joints acting up.

http://www.neato.org/~page/mitsu/service.html

The above site is a procedure on entering into the service mode for Mitsubishi sets..... although yours is older, it may still have similar functionality. If not, there are other service mode sites on the internet - just do a goodle search for them.

I am sure the problem is related to convergence and/or deflection circuits, but I think a diagnosis with hands-on experts will be necessary.

If we knew what the exact problem was, you could probably fix it by yourself.... But I have not experienced this symptom before and I cannot find any reference to it in the outer world (internet).

All repairs on big screen sets are expensive. I would never recommend repairs on a set this old. If you want to fix it for the reasons you stated, go ahead, but statistically speaking you should expect other failures to follow soon thereafter - sorry to say...

Thanks.

Posted on Mar 13, 2009

  • 1 more comment 
  • taran_2005
    taran_2005 Mar 13, 2009

    Horizontal lines means the vertical deflection system which is supposed to blank them out during retrace is not working.

    Various schemes are used to control this blanking functions in modern tvs. Years ago it was always the blanking capacitor and they were clearly labeled as such on the printed boards. However, nowdays the blanking if often a software function contained with in the workings of one of the IC chips.

    I cannot find a schematic of this unit so I cannot, therefore, give you a specific identification of the process used or the blanking components employed. However, a few Sony and Mitsubishi sets that I checked have the function integrated within the jungle chip; this is the one that processes the video signal and generates all the chroma signals within the tv prior to them being fed to the picture tube drivers.

    My suggestion is to have a tech do the job unless you want to spring for a service manual and try it yourself. The service manual will cost about $25 - unless you can buddy up with a local shop that will let you look at theirs and help identify the components on the board.

    Good Luck,
    Taran.

  • taran_2005
    taran_2005 Mar 13, 2009
  • taran_2005
    taran_2005 Mar 14, 2009

    Disregard the old one...



    The correct link would be



    http://www.eserviceinfo.com/index.php?wh...





    The schematics would be the same for most of the models.



    Thanks.

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  • Expert
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Press the volume up and down button continously for 30 seconds after turning the unit.on the tv control pannel.also if you have remote do the same on remote for 30 seconds to make it functioned by the remote.

Posted on Mar 13, 2009

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  • Expert
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Hi, This is a vertical hold problem.
You can try connecting the Cable to directly the RF input jack on the TV.
If it doesnt work, there could be a problem with the power suppply unit which connects to the tuner section inside the TV. Probably replacing the filter capacity in it would work.
Good Luck :)

Posted on Mar 12, 2009

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  • Master
  • 1,139 Answers

Hello,

This can mean that the vertical sync pulses are too low, hoever this is highly unlikely, so the other point could be that the vertical oscillator is malfunctioning.

Posted on Mar 12, 2009

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  • Master
  • 564 Answers

Hi,
Unplug all the connections and leave it for 5 mins and try connecting it back
Hope This Helps!!!  Please Don't Forget to Rate my Response!!! Thanks!!!
PREM

Posted on Mar 12, 2009

  • Prem  Kumar
    Prem Kumar Mar 13, 2009

    This model has vertical hold adjustments but I am not sure if they are on the front panel or the back panel or the on-screen menu.  Since the set is old, it could be anywhere.

    If you cannot find it, let me know.

    When you do find it, just adjust it when the set is first turned on until the picture locks in.

    Let me know if you need further help.

    Thanks,
    PREM

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  • Master
  • 3,614 Answers

Hi there,

check first the connections from your tv. unplug the unit and change the elec outlet.

Posted on Mar 12, 2009

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