This is a repair service, you must send us your Main board for repair! TV Models affected: XVT553SV? Part Number: 3655-0122-0150 Board Number: 0171-2272-3237 Symptoms of a bad Main board we can fix: HDMI don't work but TV turns on fine No signal appears regardless of what is plugged in No sound out of the HDMI ports TV does not turn on Vizio Logo keeps blinking but never turns on On screen Vizio Logo freezes and does not allow the TV to fully turn on More on the repair: Turn around time is 3 - 5 business days from boards arrival. We do not work with tampered boards. If your board has been tampered with, please give us a call or email us with details so we can discuss it further. Once your board has been fixed, we will test it in a live TV set to ensure quality. What if we can't fix your board? It is extremely rare that we are unable to fix a board, however sometimes there are instances where unusual failures can occur. If this is the case, we will send you a full refund. Your board arrives working: If your board arrives in working condition, a refund will be issued minus a $20 testing fee. Shipping fees will not be a part of the refund. Shipping: We ship with USPS priority mail ?Warranty: We offer a full year warranty on this repair for both parts and labor from the date of shipping departure.