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.
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.