r/Monitors • u/aiaz95 • 5h ago

Discussion Xiaomi G Pro 27qi Force backlight brightness - service menu

Warning: Do this at your own risk. I'm not responsible for any damage that might occur.

*I deleted my previous post due to some inaccuracy in my claim and the title.

So.. after trying countless key combinations, I finally figured out how to get into the service menu and do something with the HDR flickering. Though peak brightness takes a bit of hit, it is still obviously brighter than Local dimming set to medium.. Here's how I did it.

  1. Unplug the power cable, then display cable while the monitor is still on.
  2. Press the power button and right button at the same time. Don't let go.
  3. While holding the joystick, plug the power cable back in. Once you see the logo appear, start counting to 5 seconds, then release the joystick. The monitor should start cycling through red, green and blue screens.
  4. Plug the display cable back in while the monitor is still on. Don't press any buttons yet.
  5. Once the monitor display your video output, press the menu button. You should see tiny F letter at the top left menu. Move the joystick up to select it, and you're in the service menu.
  • (For safety, choose HDR Custom and set the brightness to 60-70% first)

Inside the service menu, look for BLCurrentTest. The default value is 1000 in HDR mode and 700 in SDR mode. Change it to 2000 for maximum brightness.

A few things to keep in mind:

There's an issue if you use HDR Standard at 100% brightness with this BLCurrentTest set to 2000. The monitor will automatically turn itself off on white screen test and it will reset the BLCurrentTest value back to default. I suspect this is power supply limitation and monitor protection mechanism.

I use HDR Custom, then bring down the brightness to 60–63%, and then set BLCurrentTest to 2000.. with these settings, I'm getting around 1600–2000nits peak brightness which is still enough for me. But since I'm measuring it with my phone, take that with a grain of salt.. Your result may vary.

YT Link for the white screen test I use: 12 Hour HDR White Screen

1 Upvotes

100% Upvoted

1 comment sorted by

1

u/AutoModerator 5h ago

Thanks for posting on /r/monitors! If you want to chat more, check out the monitor enthusiasts Discord server at https://discord.gg/MZwg5cQ

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.