Approximatelly 10-20% of picture is missing from all 4 sides.

I bought this TV in 2002 and it was working fine until 2 months ago when picture suddenly "zoomed in". Approximatelly 10-20% of picture is missing from all 4 sides which makes text unreadable. Due to that glitch picture quality is also lost. I found some information that, if analog signal is found on TV, could do this. But, when I disconnected the anthena, nothing changed. I tried a few "codes" to get into diagnostics mode but they don't work on my TV. Any help? Greatly appreciated.

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