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Re: zenith big screen
Sound is ok means power supply is ok.
as there is no picture there is a problem in video or luminance section.
1 check chroma ic supply
2 check signal line to video section
3 loose contact in video section
4 crt base loose
5 crt supply
6 no supply to g2
7loose contact in brighness line
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Make a fist with ur hand and bang on the tv bazel frame.The tv picture flickers back or bounces back to a normal picture.The tv have a vertical or a horizontal hold ics have coldsoldering joints and requiring resoldering.If u bang on the tv bazel frame picture don't flickers back or bounces back to a normal picture.The tv have a vertical or a horizontal hold ics are dead require changes those ics chips.If u don't have all the tools.Can't do a basic soldering work or able to changes those ics chips.Shop around for tv shops for estamate and repairing prices for repairing.
If you are using a cable box, there should be a setting to change your "aspect ratio". Some offer options such as fit to screen, zoom, wide, etc. see if you can change this setting from the remote. Without knowing what model cable box you have I acn't get more qpecific, but try this first.
If you are using a DTV coverter box, you may have changed the aspect ratio with your remote control. look for a button marked "aspect" or "picture size" use that to change size.
If you have a cable box, you may have a similar button.
Or you may find a picture size adjustment on your TV remote.
If you do not have "aspect" button on your remote try going to set up menu and look for picture size.
Older TVs used to have a vertical size adjustment at the back. look in the manual.
If none of the above, you have a biiger problem with the TV internal parts needing attention