I have a 32 Sharp LCD TV model number LC-32DV22U. It takes at least 20 minutes for it to power up warm up. While it is powering up, there are vertical lines on the screen. After it warms up the screen looks perfect and it works well. The power supply board was recently replaced but this didn't solve the problem. Another technician suggested replacing the TV main board. There appears to be two boards: 1. AV PCB and 2. Digital PCB. Which board should I replace or should I replace both? I posted this question before but I didn't get an answer to my question. Does anybody here know which board to replace digital or AV?

Televison & Video - Sharp