What is the triggering signal to power on the monitor?
Monitors on standby mode change state when they receive a signal from graphic card. I would like to know what is the trigger signal for the BenQ monitor to power on, is it the horizontal, vertical, video signal, ...? This is because i have a monitor which remains in the standby mode even with signals present but i have no oscilloscope to investigate any further. Any help will be appreciated...
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Try to see if this works on another computer first, if it does, then it assumes the monitor is ok. Then as the computer boots up, boot to safe mode by pressing F8 and once in that state, set the display to a mode that the graphics card will support. If none of the full colour options work, the graphics card may be incompatible, try changing the graphics card.
DPMS (Display Power Management
Signaling) is a standard developed to save energy and maximize the
useful life of computer displays. By switching the horizontal and
vertical sync lines on or off, a DPMS compliant video card provides the
capability to place the monitor into one of four modes (Normal, Standby,
Suspend, Off). Each mode puts the display into a different powered
state from fully powered up, to the Off mode. In the Off mode, only a
small auxilliary circuit is running which monitors the horizontal and
vertical signals to wake up the monitor.
If the power light turns yellow, there is no signal being received by the monitor from your computer's graphics card. The screen will shut off (go into idle mode), which is a low-power state, that saves energy. Check that the cable on the back of your computer is plugged into the right graphics card (many PCs come with more than one, these days). There may be one built into the computer's mainboard, and another one may be on a separate graphics card located somewhere else on the machine. Only one of these will work on startup. If one doesn't work, try the other.
Hi, this might be a cable plugged out from your graphics card or from your monitor. Check that first. If the cable fits ok, try changing it with another one to see if it is ok or broken. If it wont do anything, it probabbly needs to go to service for mainboard replacement. Something simillar happened to me too.
1.) Your video card is 'stuck' in standby mode, which in turn sends a signal putting the monitor in low power 'standby' mode as well. When you disconnect it, the monitor returns to normal 'on' mode. Rebooting the PC should correct this issue.
2.) Your resolution or refresh rate are set outside the range supported by the monitor. When you connect the monitor, it starts receiving a signal that it can't display, so it simply turns off. You'll need to reboot the PC and press F8 quickly to bot into safe mode and correct the monitor settings.
Most monitors will say "Power save mode" when they can tell through residual voltage that the signal lead is plugged into a machine, but there's no picture being transmitted. The four states of a monitor are:
* Off entirely. * Switched on, plugged into a computer but no video signal being received - usually displays "analog power save mode" or "digital power save mode" for a few seconds, then blanks. Comes back to life the moment a video signal is received. This state is the default in full power saving mode. * Switched on, not plugged into a computer. Some monitors don't display anything, some go into power saving mode, some fly "CHECK SIGNAL CABLE" or a similar message around the screen. Picture is restored when the signal cable is plugged back into the computer * On fully, receiving an image, and displaying.