Vizio 3850-0012-0187 Main Unit/Input/Signal Board 0171-1472-0351 Please order by the part # below to ensure compatibility. Ordering by board # or TV model # will not guarantee compatibility with your unit. Please contact us with any questions: 3850-0012-0187 Other Board #s and TV Model #s: 0171-1472-0351 P50HDTV10A P50HDTV20A VP50HDTV10A