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How to Fix a Digital Stream DTX9900 HD Converter

stopped working and only has stuck on green flashing or blinking light, no more red
The Digital Stream DTX9900 HD converter has a common problem: the capacitor stops working.  This causes the light to constantly blink green, and the converter fails to function (no signal transmitted to the connected tele
Just a few things are needed.  I prefer lead-free electrical solder available at Radio Shack.  My soldering iron is like 40W.
Just a few things are needed. I prefer lead-free electrical solder available at Radio Shack. My soldering iron is like 40W.
vision).  Often, before this occurs, the green light comes on as a solid non-blinking light, and the unit functions only after a reboot.  But eventually, the systems degrades to the point where the light blinks green and it has to be fixed.  To fix this, you have to replace the capacitor.  It is very easy to replace and requires no specialized skills.
What you have to do is locate the capacitor.
this is the part you have to replace.  It will often have some residue or brownish/black gluey substance on the top.  Apparently it gets that discoloration when it blows.
this is the part you have to replace. It will often have some residue or brownish/black gluey substance on the top. Apparently it gets that discoloration when it blows.
To get it out, remove all visible exterior Phillips screws and open up case.  Remove the clip for the power cord, and unscrew the (two, iirc) Phillips screws holding down left-side circuit board (on the left when looking at the unit from the front face plate; that is, the printed circuit board formerly connected to external power chord).  Remove the plastic multi-pin connector to the right circuit board, as well as screw holding down the black power wire on the right side printed circuit board.

 

Now, taking the removed left side circuit board, use a heated soldering iron to melt the solder away from the two wire connectors at the base of the capacitor (see the two wires dangling from capacitor in the picture to the right?).  Then, while the solder is hot and melted, pull out the capacitor with a pliers.  Then buy a replacement capacitor.

Here is the Amazon.com replacement capacitor I used: 330uF 16V High Temp Radial Capacitor .  Solder the new on in by heating each of the two wires at the base of the capacitor, and holding the solder on the other side of the wire (touching the wire, not the solder), to heat up the solder.  When a nice droplet of solder falls into each of the two holes, use a wire cutter to clip off the excess wire.  Assemble everything back the way you took it apart and it should work.  The green light should not be blinking any more, and it should work as it used to.

References:

link to defective product: http://dtvconverterboxes.blogspot.com/2008/07/digital-stream-dtx9900-review-rating.html

text of the solution at fixya.com that helped me out:

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

radio shack's product page: http://www.radioshack.com/pwr/product-reviews/Other/Digital-Stream/p/3150939-Digital-Stream-Digital-to-Analog-Converter-w-Pass-through.html

another corroborating review: http://www.complaintsboard.com/complaints/digital-stream-dtx-9900-c338145.html

how to change capacitors: http://www.tomshardware.com/forum/99446-30-removing-changing-capacitor

fixing the remote buttons: http://dtvconverterboxes.blogspot.com/2009/05/digital-stream-dtx990-owners-manual.html