This is likely some parts failure. You can see the service manual herehttp://www.atariguide.com/pdfs/Atari_2600_VCS_Domestic_Field_Service_Manual.pdfWhich has part replacement diagnostic flowcharts.
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Answers & Comments
This is likely some parts failure.
You can see the service manual here
http://www.atariguide.com/pdfs/Atari_2600_VCS_Domestic_Field_Service_Manual.pdf
Which has part replacement diagnostic flowcharts.