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Originally Posted by heathkit tv
My 80's vintage Zenith color sets had secret menus that allowed the repairman to fool with or check various settings, am wondering if my present Sony Wega set has this as well. Anyone know?
I bought this set as a demo and never got the owner's manual and Sony's website is useless in this regard......does anyone know what the "VM" control is or does? This is listed within the "Video" menu. There are 3 choices, Off, Low and High. I don't see any difference at all between any of them!
One neat thing is that there's a tilt correction which allows you to tilt the picture left or right. When at the showroom I noticed a few Sonys askew and asked the "salesman" (IE: ignoramus) about this.....I feared that perhaps there was a bad batch of sets. Turns out they were just adjusted goofy, probably some trouble maker like me who knew about this and screwed with them! LOL
Anthony
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Anthont,
The VM for Sony sets is velocity modulation.Other manufactures call it SVM,scan velocity modulation.It's basically the speed of the trace to help sharpen the outside prtion of the display area.It can be turned off in the service mode.I don't know if the newer sets eliminate the effect,but the "film" mode used to.I don't think most people would notice the difference.
To access the service mode on Sony sets from the mid 90's on,the sequence is:
With power turned off from the remote,operate the following keys on the remote within a second of each other.
Display
5
volume +
power on
To exit the service mode,power off the set via the remote.
Caution:If you don't know what you're looking at, you can create a real problem for yourself if you make changes while in the service mode.some of the parameter values are obvious,most aren't. 
to navigate between the parameter vaues,operate the 1 and 4 keys.to change a value,it's the 3 and 6 keys.the parameter values step in sequence.they are usually grouped together by function.for example,there will be geometry parameters followed by video paremeters,etc.
there are some web sites that might expand on the service mode area,but in most cases,people are reluctant to pass along this kind of info.They may be ISF people and don't want to lose business.