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Q:

dashboard on/off blinking for several minutes after start - cold weather bad on 2000 Audi TT Quattro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
This problem started a year ago but in the beginning only less than a minute and only when the weather temp. was low (close to or below 0 deg. cel.). Now is has become much worse and the instruments on/off can continue after start for 10-15 minutes even in quite warm weather. If the car is very heathed by the sun I never have this problem.
(1) Answer
Sounds like the Instrument Panel circuit board may be wearing out. I have replaced several in Audi vehicles so it is not uncommon.