Yealink SIP-T48G - Manual (Page 35)

Customizing Your Phone
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Backlight Idle Intensity decides whether the IP phone turns off or dusky the backlight of
the touch screen after a period of inactivity.
You can configure the backlight status on the touch screen as the following types:

Always On: Backlight is on permanently.

15s, 30s, 60s, 120s, 300s, 600s, 1800s: Backlight goes out or turns dusky when the
phone has been inactive for approximately 15, 30, 60, 120, 300, 600 or 1800
seconds.
To configure the backlight via phone user interface:
1. Tap ->Basic->Display->Backlight.
2. Tap the gray box of the Backlight Active Level field.
3. Tap the desired level from the pull-down list.
4. Tap the gray box of the Backlight Inactive Level field.
5. Tap the desired value from the pull-down list.
6. Tap the gray box of the Backlight Time field.
7. Tap the desired time from the pull-down list.
8. Tap the Save soft key to accept the change or to cancel.
Backlight is configurable via web user interface at the path Settings->Preference.
You can configure the contrast of the expansion module EXP40 connected to the
SIP-T48G IP phone to a comfortable level on the phone. Ensure that the expansion
module has been connected to the phone before configuration.
To configure the contrast via phone user interface:
1. Tap ->Basic->Display->Contrast.
2. Tap the gray box of the Contrast Level field.