Fuse

I actually have a Hitachi 51A500, but even Hitachi took a while to find it, so I am using the 51F500 for assistance.

I recently had a problem with my power coming into my house(bad neutral line( and it shot 240volts through my tv and knocked it out.

I had a service man come out and opened it up, took a tester and touched it to a couple boards and told me my horizontal is out and wanted $450 to repair it. I may be wrong but I don't think you can test the horizontal without power running to the TV, is this correct?

I opened the back and noticed that there is a slot for a 6A 125v fuse, it is located just to the right of where the power cord enters the back of the tv. This fuse is missing, did he take it and could this be my problem? I would like to know if it is what type fuse do I need to get?