Na check nyo na po ba kung may ibang apps na nagko-cause na laging bukas ang ang phone screen? Like Always On display app?
Na try mo ba tignan sa dilim kung may ilaw parin kahit naka power off na? Kasi ang AMOLED ay true black unlike LCD na gumagamit ng backlight.
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As with your concern, have you checked this for the "Always-On-Display" option from your device settings?
Turn Always On Display on or off
Always On Display is very handy, but maybe you want to save some battery power. No worries, you can turn your AOD on or off whenever you want.
From Settings, search for and select Always On Display.
Tap Always On Display, and then tap the switch to turn it on or off.
From this screen, you can also adjust the AOD's settings. Please see the next section for more details.
Should the problem still persist, try and do a CLEAR DATA CACHE from your device settings, and try to do a FACTORY DATA RESET should the clear data cache not work.
Hope this helps. Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.