Hello,
I have a two year old 43UN700-B Monitor that I have two computers connected to. One via Displayport and the other through one of the HDMI ports. Recently, the computer connected via the HDMI stopped displaying. I connected it to all the HDMI ports and the USB-C port with no display. I hooked to the one Displayport and it worked. Then even the Displayport started taking a long time to be recognized. It would eventually come on but it took awhile. Assuming it was a bad motherboard, I ordered a EAX69012401 PCB. It was a used unit reclaimed from another monitor. I swapped the eBay unit in and immediate could see that it was also bad as it had half the screen was black. I did go ahead and try the HDMI and Displayport on the eBay unit and it appeared to show the same behavior as the original; HDMI and USB-C don't work, Displayport works after a slow response. I put the original back in and I am returning the eBay unit. My question is, could this behavior be power supply related (or something else)? Are there any tests I do to troubleshoot it further.
Thanks,
I have a two year old 43UN700-B Monitor that I have two computers connected to. One via Displayport and the other through one of the HDMI ports. Recently, the computer connected via the HDMI stopped displaying. I connected it to all the HDMI ports and the USB-C port with no display. I hooked to the one Displayport and it worked. Then even the Displayport started taking a long time to be recognized. It would eventually come on but it took awhile. Assuming it was a bad motherboard, I ordered a EAX69012401 PCB. It was a used unit reclaimed from another monitor. I swapped the eBay unit in and immediate could see that it was also bad as it had half the screen was black. I did go ahead and try the HDMI and Displayport on the eBay unit and it appeared to show the same behavior as the original; HDMI and USB-C don't work, Displayport works after a slow response. I put the original back in and I am returning the eBay unit. My question is, could this behavior be power supply related (or something else)? Are there any tests I do to troubleshoot it further.
Thanks,
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
