Furuno MU-155C - Manual (Page 21)

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4.2 Adjusting Display Brilliance
The display brilliance can be adjusted as follows.
1. Press the [BRILL] key on the display unit to show the BRILL adjustment window.
BRILL window
2. Press the [◄] or [►] key to adjust the brilliance. (Setting range: 1 to 50)
You can also adjust brilliance by pressing the [BRILL] key.
3. Press the [▲] or [▼] key to close the window.
The window is erased when there is no operation within five seconds.
Note:
Avoid excessively low brilliance to prevent display irregularities.
BRILL 50