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3D TV, High Definition Television, HDTV 4K and AV
3D 4K and Ultra HD TV
Octagon sf8008 no output
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<blockquote data-quote="Terryl" data-source="post: 1084289" data-attributes="member: 369937"><p>The main DC power input to the receiver is from an external +12 DC wall wart right?? </p><p></p><p>So somewhere there is a voltage multiplier circuit or switching circuit to get the +18 volts DC needed to switch to a different transponder on the LNB, this voltage multiplier or switching circuit could have a damaged component in it, (thus the burnt plastic smell) and maybe causing the ringing noise, cant go too much further with out a schematic of the unit.</p><p></p><p>One way to look for a bad IC or other component would be a thermal scan of the PCB, this would give you an idea on a bad part by it's thermal image.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1084289, member: 369937"] The main DC power input to the receiver is from an external +12 DC wall wart right?? So somewhere there is a voltage multiplier circuit or switching circuit to get the +18 volts DC needed to switch to a different transponder on the LNB, this voltage multiplier or switching circuit could have a damaged component in it, (thus the burnt plastic smell) and maybe causing the ringing noise, cant go too much further with out a schematic of the unit. One way to look for a bad IC or other component would be a thermal scan of the PCB, this would give you an idea on a bad part by it's thermal image. [/QUOTE]
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3D TV, High Definition Television, HDTV 4K and AV
3D 4K and Ultra HD TV
Octagon sf8008 no output
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