@garyribbans we have to see what;s going on with your boards. Post some well focused, large pictures of your boards.
I do not think it's your T-con board but, it is of course possible. On one of the pictures you need to post, mark the area that you sprayed with freeze spray (excellent diagnostic tool :-)
This could be an issue with the driver boards and by freezing the T-con board you may decrease data rate or power to the boards. What do those lines look like when your monitor turns pon. Again, pictures will help. [guide|21499]