My 17" ColorSync, which is otherwise pristine, sadly has terminal video problems (meaning it is presently a boat anchor): it started to go out of focus for some months, then the screen partly disappeared, then it would black out, then it got put away for a year and has been awaiting disposal or repair (I can't bear to throw it out). I might give fixing it a go if it were not so dangerous in there.
Is retouching the solder around there a difficult thing to do?