Picked up this morning, Friday, by a keen GZ member.  Thanks everyone for your interest and good luck to Jason on repairing the monitor. - Michael

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My LG 29" Ultra-wide monitor suddenly went to a black screen recently when I switched inputs.  The LCD screen is black, non-responsive but the LED backlighting is still on.  The on-screen display (OSD) does not work, the headphone audio jack still works and the monitor is detected and available as an external monitor.

A bit of Internet searching reveals this is not so uncommon and most probably caused by the failure of a Monolithic Power MP3378E (28 pin integrated circuit) display controller.  See LG 27GL83A-B suddenly went black, no OSD. : r/Monitors (reddit.com).  The service manual is available online and the MP3378E IC is around $15-20.

So, if you are willing to give it a go the monitor is FREE. Pick up in central Auckland.  What a deal. 😉

PS-In case you are wondering I bought it in 2018 at PB Technology.  After almost six years I don't think the CGA would help much.  It is still a good monitor if you need more screen space. - Michael