Model Number please .

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ups.com...
I have run into about 4 or 5 sets with this problem. Set will work for
from 30 min to an hour or more, then a black bar comes into center of
picture & spreads vertically untill screen is blanked completely out
(black) Cooling the T chip will restore picture, even puting finger to
body of chip will correct problem a short while. I have been unable to
locate the problem. I just put a small computer fan blowing down on the
T Chip & seems to be fine. Has any one run into this if so HELP I
sent one to a chassis rebuilder (TWICE) for repair the second time it
worked after a 2 month wait. It came back with (NO PROBLEM FOUND) but
it worked & as far as I know it is still working