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Viewsonic A91f+ screen keeps moving on its own
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Posted by: SKYHN
A friend of mine recently bought this monitor, and she is having a problem with the screen position moving on its own. It happens randomly.
Has anyone heard if theres a problem with that particular monitor doing that? Ive checked around and cant seem to find any info on this.
Posted by: Antti2004
Could you spesify the 'moving' ?
If you mean that the whole screen moves the randomly especially after warming up the fault will be in the vertical and horizontal control chip.
If the screen jitters, blanks, goes to a single line or anything like that then the faul lies on the frame circuit and often again a frame chip that after heating up goes bonkers.
If there is thick line appearing after a while it will be capacitor in the smoothing part of the power supply.
If lots of adjustment goes of after while it is the control (CPU) chip that failed.
Other compnents on the relevant circuit are resistors, diodes and capasitors 'leaking'.
Check for any dried soldering, especially on earthin, and underneath compnents that have a heatsink.
Well the story goes on, I could write a book about this suppect if there weren't already plenty of them. 
Hope this give some idea, BUT be careful, IF CRT tube (as I presume in use) they store nasty electrical charge and especially the LOPTY creates when elecrticity supplied 10 000 Volt , it probably will not kill, well not I haven heard in this repair trade such thing happend, BUT it will give extreamely nasty chock and makes the hair stand up and the eues pop and everything else drop.
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