Old thread here, I bought a 50" RCA plasma Jan 2013 at B.B. new in box clearance for $359.00 (great price for a NIB 50" plasma) it's a discontinued model, works good no issues,excellent picture says made by On corp on the back.
I've not had the back off so not sure what's in there but I imagine it probably has Samsung stuff in it like the OP's set. it does have 4 HDMI inputs though so that's OK looks decently made.
TCL was making the RCA sets for a while but terminated the brand/trademark licensing agreement so they could expand TCL brand in US .
not sure who actually made this one On corp is listed as a South. Korean company but the set was made in China . so looks like ON corp. found an alternative manufacturer.
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RCA brand and trademarks are owned by Technicolor .S.A formerly Thompson S.A. and Sony Music Entertainment.
On January 27, 2010, Thompson S.A. changed its name to Technicolor, re-branding the entire company after its American subsidiary.