Hello and Welcome. My name is ***** ***** I'll assist you today. I'm sorry you're having trouble with it. I need additional info to troubleshoot the issue.
1- Could you please get me the model number written on back of TV?
2- Does the picture height problem occur regardless of what video source is being watched on TV?
Thanks for the info, sh674651423 seems serial number, please recheck nearby for model number.
FTVD521T(A) is model number and I'm having hard time to get related manual copy.
Do you have Ferguson remote that came with the TV?
If so, what happens when push Zoom button on it while having TV channel?
Please reply back with the result.