I have a 55" Philips HD (55pp9352) I subscribe to VOOM and the picture was not centered so in an attempt to fix it i had to change the geomtry settings in the service menu. I can't get all of the edges straight and quite frankly am a little confused on what some of the settings do. Here is a list of the settings... WIDE BLANK HOR. SHIFT HOR. PARALLEL EW. WIDTH EW. PARA EW. TRAP HOR. BOW VER. SLOPE VER. AMPL S CORR VER. SHIFT FAST BLANK I completely understand HOR. SHIFT, EW. WIDTH, VER. AMPL and VER. SHIFT. The others i am not so sure about. Can anyone explain them to me? Or even just link me to somewhere that explains them. THanks!