It could be the lower scan drive or buffer. Below is a list of parts for your TV model. This company's technicians can help you over the phone and find the part you need.
http://www.tristatemodule.com/t-Search.aspx?q=42PF9630A
Testimonial: "Thanks Ed, will look into it. Thank you."
If you wish to get more details, check this site. Pull up older posts there. Check the site with patience, as it has over 2250 posts now. All are related to electronic equipment repair help. Search the site by 'Timeslide' option. It will make search easy. Or, type in the brand name to your device into its search box, and press "Enter"
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