I do not have good news for you---if it has lines etc and clears up after several minutes--usually as it gets worse it takes longer and longer, you have a bad HYPER board--very common in these sets--board is now only available on an exchange basis--means board has to be removed and sent out for rebuild/repair.
Toshiba no longer sells this part--I just helped someone else here yesterday with a slightly different model with the same problem--he was very savvy and I sent him a photo of the board and the 10 surface mounted caps that go bad--not a job for most do it yourself people--what goes bad here are several surface mounted caps on the Hyper board--they dry out from the heat and age...
To make matters worse--most of these boards are soldered in--there is a national company who can repair/rebuild the board in your model: part number for the rebuilt board is: 23148024
This board costs about 220 dollars not counting labor to get it our and shipping etc.
The person I stepped through the repair did it himself for about 25 dollars in parts cost.
The company that does this kind of repair is PTS electronics
Let me know if you have any questions or need advice--I am here to help people--I cannot always give good news but I would bet you have a bad Hyper board.
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