Yealink SIP-T38G - Manual (Page 32)

User Guide for the SIP-T38G IP Phone
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Theme 2
Theme 3
Theme 4
You can also change the theme via web user interface at the path Phone->Preference.
You can configure the backlight status on the LCD screen as the following types:

Always on: Backlight is on permanently.

1min, 2min, 5min, 10min, 30min: Backlight is turned off when the phone is inactive for
approximately 1min, 2min, 5min, 10min or 30min.