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Re: Vertical pinch on left hand side of crt
You mean the picture on the left side is curved out? Or is it restricted to the very top and very bottom?
If you have the curve problem, look in the menu and see if there is a
pincushion control and a pin cushion balance. Adjust the balance until
both sides curve the same, then adjust the pin cushion control to
remove the curve.
If you are only having the problem in the corners, look in the menu for
a corner correction control and play around with it to see if it
corrects your problem. If the monitor has no OSD (on-screen-display),
then it may be too old to have these controls. You may have to open the
unit and see if there are any physical adjustments (little
potientiometers). You might want to leave this to someone who knows
what they are doing since the high voltage circuit can have 25-35 kV.
Considering the price of CRT monitors, you might be able to find a new
one for under $50.
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It sounds like you have lost the vertical sweep circuits, it can be the Vertical out put IC is bad, Vertical yoke winding is bad, caps is bad. You will have to open it up, but you must be real careful since the picture tube can hold high voltage (24~30,000 Volts) for a long time after the monitor is unplugged, you will need to discharge the picture tube first before working on it. You may want to leave this to the pro. http://s807.photobucket.com/home/budm/allalbums
I have seen this when using HDMI cables from the computer side.. The TV has a resolution that is not always full screen with TV shows. There is a setting that allows you to "zoom". My TV has 4 settings: normal, stretch and crop, stretch left and right, stretch and pinch (shrug).
To my knowledge, it is not the zoom that has to be adjusted but rather the horizontal width, zoom would expand all (to, bottom & both sides) whereas your only concern are the two sides.
Should the horizontal width not fully expand, then there is an internal problem with the horizontal deflection circuitry which could either be the yoke, a capacitor or shunt diodes. In certain instances, a below normal voltage at the mains or the internal power supply could also cause this.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
to remove the back cover of samtron 56 v monitor is very simple.
locate the 2 bottom screws of the cover, remove them. pull slightly back the cover holding the bottom and about half an inch gap will be seen. insert a flat screw driver straight down through the upper side hole with your left hand and hit the head of the screw driver with your right hand. a slightly big sound is heard and that side is disengaed. repeat he same with the second hole. and you have done it. try.
the best way to adjust is first of all you reduce the height or make picture cinemascope.
now from select button agjust vertical & horizontal geomatry
now you increase the height as a whole.
I think this will solve your problem.
you can also refer owener manual if you have it.normally it comes with monitor.
If the owner's manual covers it, I would do a factory reset on it.
I would also test the PC and video card by trying another monitor to be sure.
I would check the pins for ones which are bent or broken, and check the cable for pinched spots.
After that, I would say the monitor has a bad signal / video board in it.