Re: viewsonic vg720 no power, blown transistor on mainboard

It worked ! Thank you very much for the advice. My first guess was the solder blob would have been the problem as the U406 seemed OK from the outside. You prevented me from removing the blob and that saved my screen !
Thanks again !

Re: viewsonic vg720 no power, blown transistor on mainboard

You may not be that good but you certainly are that helpful. In no way could I have found by myself the solder blob was normal, as I'm absolutely not familiar with electronic terms and therefore lost with any related web search. Thanks for that information.
I have no measurement tool neither the means to get one (back in a hurry from Japan, I just assembled a computer with parts from people's donations ) so I will try to remove the U406 and see if that solve the problem. I suppose melting the three solders with a...

Re: viewsonic vg720 no power, blown transistor on mainboard

Managed to open it.
The U406 doesn't seem burned from the outside (not that I can check it's fine or not).
Also there's something that seems odd to me on the other side of the board. There's a connexion between two rows like it has melted. But maybe it's the way it's supposed to be.
Here are the pictures (what would we do without pictures)....

Re: viewsonic vg720 no power, blown transistor on mainboard

Hello everyone,
My ViewSonic VG720 just went the same way yesterday: no power , no led. Glad you found the problem and solution, I intend to remove the U406 part and wish for advice. I might sound dumb but after removing the stand I can't find a way to open the monitor. Being new to the insides of computers and electronics, it would be great if you could tell me about how to remove this reset controller.