I have been having considerable problems with my Samsung 55" tantus set(HCM553W-xac). Ranging from convergence and just plain weirdness with (now serviced and fixed) vertical line that used to run down the centre of the tv. Some things I had no choice to take it upon myself to fix as ISF calibration is postponed to the summer as my brother is getting married and all extra funds are being allocated for that which is taking place in the Dominican . I'm mostly looking for some clarity when dealing with the service menu abbreviations. Such as R-YR R-YB G-YR G-YB BPO BWD I know the first four deal with colour decoding just not sure what does what Also in the convergence/geometry menu I don't know what the vertical and horizontal offsets do or up-correction and low-correction. In the grid menu I don't know what each box size should be but was able to figure out most of the controls(though It took me awhile to figure out how to save it ) And got the picture so atleast everything was lined up nicely) Anyone familiar with this set? or can tell me either here or offline what some of this stuff means. I've already had to different techs in my house the second was decent but forgot to do the convergence the first guy was horrible.