Possibly this is a thermal fuse problem. Does the screen gets hot? Are the back/ventilation holes covered?
SOURCE: startup issue
Sounds like a problem in the power supply section that will need component-level electronic troubleshooting. If it's under warranty and less than 30-60 days, I would suggest an exchange. If not, I would call the number in the manual for help.
SOURCE: Monitor
-Turn off both computer and monitor
-unplug monitor from computer(still plugged into power supply)
-turn on computer and monitor(monitor is still unplugged)
-After computer is on for about 30 sec. plug monitor into computer
-turn off both monitor and computer(now connected together)
-turn on monitor then computer and should be good to go!!!
SOURCE: Hitachi CML174SXW B randomly goes black
Have you noticed if the monitor gets hot before it turns off?
Please, don't open a monitor and try to repair it yourself. It can be very dangerous and it's not worth getting injured.
SOURCE: Screen goes blank
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Cause of power going
off: There is a bad 1000uF, 16V cap
on the power supply board.
Solution: Replace cap. Radio Shack sells a 1000uF, 35V
cap for $2. This will work.
Why did the cap go
bad? The cap is too close to a heat
sink and over heated.
What does this cap
do? This cap sends a signal to an IC
which keeps the monitor 'on' after the power switch is pushed. When the cap is weak, AC ripple voltage is
applied to the IC and it sends a signal to shut the monitor off.
Opening the Monitor:
These monitors are difficult to open.
The two plastic pieces snap together and must be pried apart
with a flat screw driver.
After removing the stand, you need to insert a flat screw
driver at the bottom of the screen where two slots are located. Then work the screw
driver around until the two plastic pieces are separated.
Remove the cover plate and unscrew the push button circuit
board.
Unplug the monitor cords from the driver board and remove
the screen.
Unscrew the mounting screws from the power supply board and
remove.
You will need to pinch the plastic support in the middle of
the board to remove.
Cap Replacement:
Cap is located near a copper heat sink and the value will be
on the side of the cap. It will be bulged up on the top. You will see burn
marks on the board surrounding the cap. Unsolder the cap.
Install the new cap and solder. Make sure you connect + of
the cap to + marked on the board.
Be careful not to solder across joints.
Keep leads long so you can bend the cap as far away from the
heat sink as possible.
Reassemble monitor and turn on.
This should solve the problem.
SOURCE: lcd monitor goes black
If the monitor doesn't work on any computer then the monitor is defective, it probably is the screen that is the culprit, the backlight isn't staying on. Replacing the screen would cost more then the monitor is worth so its worth it just to get a new monitor.
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