so far no proper details are available regarding resetting this particular TV ( f32648 ) .... i have checked user manual also
have you tried following things
1 - playing different dvds (dvd player )
2 - changing different channels ( cable tv or antenna )
3 - increasing ( to maximum ) & decreasing ( to minimum ) [in menu ]
contrast colour tint black level sharpness
picture presets auto colur colour warmth
4 - auto channel searching ( cable tv or antenna )
even after these trials if picture is in black & white then it is a hardware problem - since it is a rare problem no details are available about which component might have got deffective ...... only the service engineer who opens & checks your tv can tell the exact deffective component .......... sometimes it can be loose connection ( cracks at soldering joints - hit your TV lightly with your hand on left side or right side or on top - if color comes & goes then it is loose connection problem - all soldering joints should be resoldered by service engineer ) ..... or an IC might have got deffective ......... only after opening & checking your tv mainboard exact deffective component can be identified ......
for nearest RCA service center call 1800 336 1900 ( this number got from your TV's user manual - click this link for your TV's user manual - free down load - RCA F32648 model -
http://download.rca.com/FilesForRCAcom/Manuals/15491880.pdf
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