Hello to the forum!
I am currently troubleshooting the Dell U2718Q monitor, which will work perfectly until it randomly shuts down and after a number of minutes will power on and work again, until it randomly (but quicker) shuts down again.
After some investigating i came to the conclusion that this is due to the Mstar MST9U37Q1 controller overheating, causing the monitor to shut down. When the controller is cool enough it will start working again. The power supply voltages at all times seem normal, nothing else feels hot on the board and by using a hair drier to play with the temperature it seems that this is the culprit. The controller has a soldered on heatsink which had a very bad application of thermal paste underneath. Replacing the thermal paste did nothing but to prolong the usage of the monitor.
Searching for datasheets or schematics for the ic and monitor showed nothing. Has anybody any clue to the solution of this problem?
Thanks a lot!
I am currently troubleshooting the Dell U2718Q monitor, which will work perfectly until it randomly shuts down and after a number of minutes will power on and work again, until it randomly (but quicker) shuts down again.
After some investigating i came to the conclusion that this is due to the Mstar MST9U37Q1 controller overheating, causing the monitor to shut down. When the controller is cool enough it will start working again. The power supply voltages at all times seem normal, nothing else feels hot on the board and by using a hair drier to play with the temperature it seems that this is the culprit. The controller has a soldered on heatsink which had a very bad application of thermal paste underneath. Replacing the thermal paste did nothing but to prolong the usage of the monitor.
Searching for datasheets or schematics for the ic and monitor showed nothing. Has anybody any clue to the solution of this problem?
Thanks a lot!
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...
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