Libra 2 Kobo Libra 2 – High battery drain during sleep

[chungkol]

Hi everyone,
My Kobo Libra 2 originally had a Rev F motherboard, which failed. I replaced it with a Rev A motherboard, keeping the original display and updating its VCOM value.
Everything works fine except for unusually high battery drain during sleep.
I measured the current using a multimeter:
- Power OFF: ~0 mA
- Reading: 40 mA
- Sleep: 130 mA
Strangely, sleep mode consumes over 3 times more power than reading!
I've already tried a hard factory reset, replacing the SD card, flashing a fresh system image, disabling Wi-Fi, and turning off the sleep cover wake-up feature, but nothing has fixed the issue.
Has anyone experienced this? Could it be a compatibility issue between the motherboard and display, or is the device failing to enter proper suspend mode?
Any suggestions would be greatly appreciated. Thanks!