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Guest Message by DevFuse

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


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3 replies to this topic

#1 OFFLINE   jorb

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Posted 27 March 2008 - 05:11 PM

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?

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#2 OFFLINE   litzdog911

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Posted 27 March 2008 - 05:16 PM

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.
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#3 OFFLINE   jorb

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Posted 27 March 2008 - 05:35 PM

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.


I'm a newbie to dbstalk I wanted to post this question in General DirecTV™ Discussion and made an error.

#4 OFFLINE   longrider

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Posted 27 March 2008 - 10:21 PM

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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