MUST ORDER BY PART NUMBER ONLY!!!!! FOUND ON STICKER ON BACK OF TV – THERE CAN BE MANY VERSIONS WITHIN THE SAME MODEL NUMBER THAT ARE NOT COMPATIBLE!!! Vizio Y8386490S Main Board for P602UI-B3. MAKE SURE THE NUMBERS YOU SEE ON THE STICKERS MATCH THE ONES ON THE LISTING. DO YOUR PROPER TROUBLESHOOTING BEFORE ORDERING. PLEASE ASK BEFORE ORDERING IF UNSURE. WE WILL TRY AND GET BACK TO YOU AS SOON AS TIME ALLOWS.