Hello... TV's theses days are like computer parts builds, Just easy changeable cards in them.
I fixed mine by parts found on EBAY... a card at a time. The numbers are printed clearly on them for searching. The lowest price card I would try first would be your LCD Display card. It is the one that has Two Thin Ribbon flat type cables going to your LCD.
There are great number of Parts available by People who are parting out shipping damaged units and from Repair Shops, Most Sharp models of TV's share the same cards in them, as long as you have the right part # match to your model... Its pretty much Plug and Try... My Main CPU/GPU card was $65 to fix my Sharp Aqous... But I have spare PS card now $35... and a spare LCD Display card $30...