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LG 31MU97 4K Monitor Service Menu Help

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LG 31MU97 4K Monitor Service Menu Help

Postby castlefire » 07 May 2018, 02:32

so a couple of days ago my LG31MU97 monitor Displayports went crazy. after reading online looks like the EDID is corrupted The HDMI works at 4K but only at 30hz. I need Displayport so i can run at 4K DCI at 60hz I was able to get the service manual but cant figure out how to get into the mode.

I was hoping to reflash the NVRAM, but can't figure out to get into service mode even with the instructions. This monitor uses joystick


again thanks
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Re: LG 31MU97 4K Monitor Service Menu Help

Postby k2viper » 14 May 2018, 07:14

Hmm... that's a first instructions I saw for any LG monitor with joystick, to get in Service menu.
Did you tried that sequence?

1. Power off, then power on
2. Push left 3 times, then right 1 time, and then press the joystick button
3. Then press left or right and you should get in service menu.

ps. Pls give a link where did you found this adjustment manual. Maybe there is something interesting for other newer LGs.

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Re: LG 31MU97 4K Monitor Service Menu Help

Postby castlefire » 05 Jun 2018, 03:32

thanks for the reply i have the complete service manual i will post online btw i tried it. still no luck do i use the power switch in the back or use the joystick to turn it on and off.


also here is the service manual
https://drive.google.com/open?id=1YBZRK ... tF3wtVncWg
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Re: LG 31MU97 4K Monitor Service Menu Help

Postby k2viper » 06 Jun 2018, 04:09

Also no luck getting to service menu using this sequence on LG 27GK750F-B.
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Re: LG 31MU97 4K Monitor Service Menu Help

Postby fakefaketington » 03 Aug 2018, 09:00

Thanks for the manual link.

After a bit of experimentation, figured out that what they actually mean is:

* Power off the monitor (soft power-off is fine).
* Press left-left-left-right *while off* (this is the only "magic sequence" bit).
* Press the middle "select" button to power on as normal.
* When the display is on as normal, press the "select" button then press left to choose "Menu" (i.e. as normal), but "Menu" is now tied to the service menu until the next power cycle.
* To exit the service menu, scroll to the blank bar at the bottom and press "select".

Does anyone know if it's possible to control the monitor via the USB-serial device exposed via the monitor's USB hub? (it's a Texas Instruments TUSB3410 USB-serial controller, shows up as e.g. /dev/ttyUSB0 on Linux).
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