Like many others on this forum, I too had the blinking light issue. I have done the repairs mentioned in Larry's guide, but no luck. So I had a TV shop look at it for others issues. The diagnosis given by the shop was to have the DM-Board sent to Mitsubishi for repairs at a cost of around 600 for total repairs.
I'm not sure if I want to spend that kind of money for repairs. Wanted to see if there were other repair options or other companies that work on DM-Boards.
Thanks,
Diskpack