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dude its a manufacturing default contact service center and they will fix it or replacement will be given and dont try to fix your self as this could terminate your warranty or if your warranty is expired than upgrade with a new Led monitor as it is better than LCD bye t.c
By shutting down do you mean you get a signal then it goes to no signal, or does it just show no signal regardless of what PC it's on? It sounds like you have display and backlight to see the no signal message so I would guess that the board inside that takes incoming video and sends it to the display has gone bad, or a component gone bad. Anymore electronics get 2 to 4 yrs old and electrolytic capacitors swell or burst on top causing problems from totally dead to weird errors that seem like something else. It just comes out of the blue too, most time no advance warning. Without getting inside the monitor to check it's hard to tell but someone that does bench repair should catch it if there are swollen or leaking capacitors especially if you mention fr them to check for them. If not then it's possible the video display chip has gone bad and a new board is needed. Probably not available anywhere but a seller that parts out working off lease equipment such as on ebay. You've already done what you should by trying a new cable and trying on more than one machine.
same problem with me.. i posted this problem .. hope i will get an answer.. This happened to me just after the 3 year warranty of monitor expired... If this is some small capacitor kinda problem then we can fix with minor charges.. but if the life of screen itself gone means .. I need to spend a lot of money to get a new one.. any responce is appreciated
It should be a power unit problem.
I had a same problem right after the 1 year warranty is expired and fixed it by myself.
I found 3 broken capacitors in a high temperture area on the power unit PCB and replaced them.
So far it is working good.
I think this is a defect of design of the power unit.
Dear user, It could be the following 4 errors: 1, Vga cable damaged. 2, Video card memory failure. 3, Lcd Panel starterd to damage. 4, The connection between the computer and the monitor is not stable, the plug is not tighten on a side it could be any sideo on the vga cable meaning you have not screwed into the monitor it can lease and fall down from the monitor.