Samsung - Samtron 75E

[GC]

Model Name: 75E
Model Code: DP17LT7L/XSA

Hopefully someone can assist with the problem...
I have horizontal lines going across the screen where ever there is
colour.....
ie where this text is, I have a faint grey line going all the way across the
screen on each line of text....
If there is something thicker/darker.... eg when I go the the start menu and
go to select an item, it highlights in dark blue.... Then I get a darker
thicker grey line all the way across the screen...
Other colours are looking funny too... the dark colours have gone darker,
the bright colours have brighter...
Anyone seen this kind of problem and may know what to replace or what area
to look at on the board?

Thanks in advance!