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Re: Hitachi 50ux14b. The picture shrinks at the bottom...
This is a problem with the vertical output IC's and associated capacitors. The solution is to replace the IC (usually LA7838) and 2 capacitors (100uF @35V and 220uF @35V).
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Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
try to see the button below and find the trimmer try to look at it and find vertical hold adjust it..if not helped just go to this link www.fixya.com/users/bugoy31
I would hope that the vertical output circuit needs some attention (that is if it shrinks from top and bottom). That should not be too expensive. Much more than 10 years old though and you are really taking a chance. Look for a manufactures date. Thanks
Vertical output chip has some ring cracks on leads (cold solder joints). Set is shutting brightness off to protect5 it's crts from burning a black streak across them.
If by saying the "aspect ratio changes" you mean the picture shrinks from top and bottom, I would suspect an intermittent short inside one of your picture tubes. The commercial skip function is not causing a problem here. It is the rapid change from dark to light that I believe is putting an extra strain on a weak or defective picture tube.
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