C03 can be found on the sticker
EAX67872805(1
Interchangeable Parts: 715G7447-M01-000-004Y
LA40R71BAL/XTL
and its presence or absence will not affect compatibility
TCL 08-CS49TML-LC224AA Main Board for 49S405TABA/49S403TBAA 50" C03 can be found on180 Day Warranty! Part Type: Main Unit, Main Board, VGA Input, HDMI Input, A V Board, Signal Board, Tuner Board, USB Input, Digital Audio Output, S Video Input Part Number: 08 CS49TML LC224AA Location: 02K4 Additional Board Numbers: 08 CS49TML LC224AA, 08 MS10S01 MA200AA, 08 MS10S01 MA300AA, V8 ST10K01 LF1V001, 40 MST10S MAD4HG Interchangeable Parts: 08 SS55TML LC308AA, T8 43NAGA MA1, 08 CS55CUN OC411AA Notice: Recommended to order by part number