Question about Philips Magnavox 20MT133S 20" TV

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My digital stream converter box DTX9900 was purchased on 8/7/08

The converter box work just fine when setup in July 2008.  As of June 12, 2009 the box isn't working.  The green on light keeps flashing and I don't have any picture or setup menu.  The box isn't shuting off (Red Light) , the green light just flickers on and off.  I purchased my boxes through the coupon program at Radio Shack.  When I hooked up the other box on the same TV I was able  to rescan and get the Digital Channels as before.  I call the tech support and was told that The company NHENS only warranties the product for 6 months. I then spoke with a supervisor who said that there was an extended warranty that I could have purchased from Radio Shack.  Why should government monies be given for the coupon program if the product doesn't last a year?  What kind of product are they investing in if the manufacturer thinks it won't last more than six months?

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  • jimmy albertz Jun 29, 2013

    i have the same problem, hit it a couple times then unplug it. wobble it around, mess with the cords.

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My (otherwise great...) DTX9900 converter box died with these same symptoms. (Units green LED flashes continuously and unit is dead)

Upon inspecting the unit I located a blown electrolytic capacitor on it's power supply board. After replacing the blown capacitor the converter has worked fine. A blown capacitor can be identified visually. The canister's top will be expanded out instead of flat. Just compare all of the caps. Look for any that are not flat on top. Blown caps will usually be discolored. The bad cap in my unit was a 330uf / 16v - 105c value cap. I replaced it with a slightly superior brand 330uf / 25v - 105c cap.

HTH

Posted on Aug 03, 2009

  • 3 more comments 
  • mrpisces_200 May 31, 2011

    How I get the box open. I took out all the screws, but I can't get inside.

  • Bruce Larrabee
    Bruce Larrabee Jun 11, 2011

    Hello,

    After removing the screws, notice the four open slots on the bottom of the case.
    Two each on the ends of the case they are right on the ends of the case. The slot
    holes are about 7/16" long by about 1/8" wide. Take a small (say 3/16") flat bladed
    screw driver and insert it gently in to the slot. Press the tip gently towards the center
    of the case to release the locking tab you are pushing against. You should feel that
    corner's locking tab release. The tricky part is to prevent the corners you have released
    from re-locking while you release the others.

    HTH,

    ZorWiz

  • G James Dec 24, 2011

    Dusted off my 30watt soldering iron and performed the fix. The 330uF capacitor was blown just as you mentioned. Radio Shack didn't stock a 330uF in my area, so I substituted a 470uF / 35v (#272-1030). It works perfectly again. It even remembered my channels. Thanks for the advice!

  • Ron Lichty
    Ron Lichty Dec 07, 2013

    Just fixed mine. Two capacitor cans (both 470uF) with the tops popped. Got (larger-in-size) ones from Radio Shack for $3.45 total. The cans have polarity (plus and minus, like a battery) - in my case, both the original, the PC board, and the replacements were marked. When soldering in the new cans worked, I drilled out the vent holes that were decorative and not open, as suggested earlier. And reassembled.

  • Dennis Shreve Jun 24, 2014

    I have performed the same surgery with good success!

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Thanks Zorwiz I was only able to get the 470 35 105 but works great you have made a old cheap man happy

Posted on Mar 25, 2010

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I'm glad that others figured this out and posted the help here, I discovered it myself back in 2009 when the main TV's box stopped working (it's LED also blinks after the unit is on for awhile since I wore it out holding the signal strength button down during early testing.). The box in my mom's room just went recently, and I'll fix it when my cap arrives in the mail. The one in my room will be next, so I'm ordering two caps now.
Thanks again for sharing the solutions everyone.

Posted on Sep 19, 2012

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ZorWiz description and solution worked for me as well.
Easy to visually identify blown capacitor.
Easy to replace. I used 330 uf 25v (50cent item locally).
Thanks for the assistance.
jwb

Posted on Mar 15, 2010

  • F9run8 Mar 15, 2010

    ZorWiz identification and solution also worked great for me.

    Easy to spot blown cap. Easy to replace. I, too, used 330 uf 25v replacement. OK for weeks now.

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ZorWiz's best solution worked for me. Could not find the exact Cap. used a 330 uf 25V 85C. Wish me luck, plan to turn unit off when not using it, used to leave it on all the time.

Posted on Nov 12, 2009

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Hello iambic6676,

Sad to say but these boxes are only meant as a stop gap, but your box should have not failed. Try this: connect your converter box to an amplified antenna and then to the TV, and see if this helps. If it does, the sensitivity on the unit has changed, I have seen this happen because of the quality of components. If the amplified antenna does not work then the unit is totally defective.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Posted on Jun 22, 2009

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