MAG LCD Shutting Down on its own

Hi,

I have a MAG LCD monitor.
A while ago it started shutting itself down after a few hours of work, and it can't be turned back on after that.

I have to wait a few hours or day and then it goes back to work only to shut down again after another few hours.

I can't take it back since it is too old so I want to try and fix it myself.

How can I start?
It sounds like it might be a heating problem but I have no idea how to check it.

Thanks.

if it is like there lcd t.vs trydoing a softwware upgrade if it has a usb port.go to there web site type in model number it will tell you the version.if it is not like there lcd t.vs then sounds like could be a signal board or power supply board

Hi,

There isn't any software upgrade I can do.
I want to open it up and check for myself but I don't know what to check.

Thanks.

I would look for the thermistor on the transformer. If the transformer is overheating, or the thermistor is bad (causing it's resistance to increase at low temperatures vs. the normal high temperatures)), both would cause a shut down.

Ohm out the thermistor, it should have low resistance at room temp. if not that's your problem. OTOH, if your transformer is getting very (very) hot very quickly, it would also cause the thermistor's resistance to increase causing the monitor to turn itself off.

Have fun!

Thanks a lot!
just one question...

Do you mean the inner transformer or the one plugged between the wall AC and the monitor?

Oh, I didn't realize your unit had an external transformer (all my LCD monitors only have internal transformers), but all external transformers (that Ive ever seen) have a thermistor also, my understanding is that it is a UL fire safety requirement.

Course that's little harder to access (those cases are often a true PITA)... You could swap out the transformer w/ another of equiv power/voltage, that'd be an easy way to try to diagnose the source of the problem.