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2 horizontal flashing sparkling lines about 1 inch apart on all of my 3 TVs

Discussion in 'DIRECTV General Discussion' started by jorb, Mar 27, 2008.

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  1. jorb

    jorb AllStar

    Mar 22, 2008
    I have 2 horizontal flashing sparkling lines about 1 inch apart on all of my 3 TVs. They start at the bottom of the screen and move up to the top. Primarily on channels 2, 4, 5. (ch 4 is my satellite receiver which is modulated then combined with off air antenna.) This only happens when the furnace turns on. My understanding is that there are 2 fan motors in the furnace. 1 fan motor is for venting fumes out of the home and only runs while the burner is on. The 2nd motor is for pushing heat through the ductwork to heat the home. Then there is this electrical igniter that lights the burner that makes a buzzing sound until the burner is lit. There is also an electrical solenoid valve that opens to release natural gas to the burner and that stays on until the thermostat isn’t calling heat any more. The lines do not appear when the 2nd motor is running by itself. (i.e. when thermostat is no longer calling for heat the 2nd motor fan runs until burner cools off.)

    Is my problem a ground loop or improper grounding or bad furnace components or something else and what would be the solution?
  2. litzdog911

    litzdog911 Well-Known Member

    Jun 23, 2004
    Mill Creek, WA
    Improper grounding can cause this AC interference to show up, especially on the lower VHF channels. These problems can be tough to solve. There are suppression devices that you can install on the AC motors themselves, but your first efforts should focus on your connection cables and system grounding.
  3. jorb

    jorb AllStar

    Mar 22, 2008
    I'm a newbie to dbstalk I wanted to post this question in General DirecTV™ Discussion and made an error.
  4. longrider

    longrider Well-Known Member DBSTalk Club

    Apr 21, 2007
    Elizabeth, CO
    I agree with checking grounding first, however a furnace is fairly easy to diagnose what is causing the issue as there is a set sequence of events in a heat cycle:

    call for heat
    exhaust fan starts
    <20 -30 seconds pass>
    igniter starts
    <2 - 3 seconds if spark ignition>
    <30 seconds if hot surface ignition>
    gas valve opens
    <10- 20 seconds for flame sense>
    igniter shuts off
    <30 - 60 seconds>
    main blower starts
    <room heats up>
    call for heat ends
    gas valve closes
    exhaust blower stops
    <30 - 60 seconds>
    main blower stops

    as you can see while there are overlaps no two items overlap for the entire heat cycle. Listen to what your furnace is doing and watch the TV
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