Bright screen on Rider 550

hburtonr Registered Users Posts: 4
Apprentice Seeker
edited January 2021 in RIDER
Hi i have a rider 550 which had condensation trouble the first time i used it, but it dried out ok, i have just got it out of the cupboard and started it up and the screen is really bright and can hardly see the map. i only bought it in june last year off ebay but it was brand new and sealed, i have been told that it is a warranty issue, but can't seem to get through to anyone to start a claim
any ideas would be great