While I can't tell you where to find a new board, we've already repaired two and I can claim you are most likely going to be able to repair yours too...or have someone repair it.
See
http://blog.coppelltvrepair.com/2015/02/repairing-1aa4b10n2020a-pwbcontroln4sg.html
Hope this helps!
Are you sure of the part number? I do not see a 1aa4d10n202oa among the parts for the Sanyo DP42848. I did find the 1aa4b10n2020a (key control) from several sites but there is a 3 digit prefix on the part number at Shop Jimmy . com among others. (Not all sites have this in stock.)
I hope this helps.
Cindy Wells
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