AM I being ripped off?

I have a Samsung LE40N73BDX almost 3 years old. Works great as TV but when I play dvd (Sony DVD player - from hard drive or disc) then two thin horizontal white lines appear across the screen one about 1/2 inch from bottom one about third of the way up from bottom.

Local company claim needs new Main PCB at cost of £ 200, would this seem reasonable, I would just like to justify the expense against buying a new one from J Lewis now at £ 549 + 5 year guarantee????

Any ideas appreciated.