Is it morally wrong to return this broken TV?

Ok, I know it is legally wrong, but how about from a moral standpoint.

I bought a flat screen at Wal-Mart. I have had it for six months and through NO FAULT OF MY OWN (no lightning, nothing) the TV just decided to stop working. I have spoken with Wal-Mart and they refuse to take the TV back since it is after 30 days.

I am left with only one option. Buy a new TV (cash of course) and return the old one.

Yes I know I could take the hit and pay to ge the TV repaired, but it was obviously manufactured defective or sub-par and not worth the $500 I paid for it.

I bet that once Wal-Mart finds out (through another person buying it and knowing its broken) THEY will get reimbursed by the manufacturer who deserves to take the loss for the sub-par product.

Is this wrong from a moral standpoint? Should I have to take the loss on a sub-par product?