bosoxchamps wrote:
I just sold a TV (Panasonic 36" flat screen HDTV set) to someone that
was working perfectly while at my home. The individual who bought TV
from me did see the unit functioning in my home with no issues using an
HDTV tuner. Upon the individual getting the set home and hooking it up
the picture size fluctuates from getting smaller to slightly larger.
This happens even when the TV is not hooked up to any input source and
just the menu is displayed. The menu gets larger and then smaller. I
have not seen this myself but I think I am accurately describing what
the individual told me.

Does anyone have any thoughts?

Thanks,
Mike

Is there an external field present !!
I once solved a "breathing display" by turning off a large Blower Motor
mounted on a wall NEXT DOOR !!

The Scan rate is slightly off-set from the National Grid for technical
reasons and as a result the Electromagnetic field from a line operated
Fan motor will cause a CRT "breath" ie show a slow slight shift in
response to an external magnetic field. A CRT is an extremely sensitive
electromagnetic field detector. If the display is swelling and shrinking
?? a High Voltage or Focus Problem ??

I would check first, by moving the screen to a different part of the Room.
This is a Flat Screen HDTV ?? Does it operate differently than a
conventional CRT?? Does it use electro-static or electro-magmetic
scanning. Or does it use a XY matrix like LCD display.

Yukio YANO