Question about HP f1905 19" Flat Panel LCD Monitor

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When I wake up my computer from sleep mode, the monitor rarely turns on. The on/off button does not work either. I have to unplug and replug in the monitor. Any suggestions?

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More likely to have dying power suppkly due to bad caps, look for that first.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Posted on Sep 01, 2010

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Windows sleep mode problems


Sleep mode on a Windows 7 PC saves power without you having to turn your computer off and without losing any work. This option cuts the power to your monitor, powers down the hard drive and pauses all functions until you awaken the computer from hibernation. Whether you have a laptop, desktop or workstation, putting your computer into sleep mode will lower your electric bill and save money! Click the "Start" button in the lower left corner of your desktop. In the lower right corner of the Start menu, next to the "Shut Down" button, is a button labeled with a small, right-pointing arrow. Mouse over the arrow. The Shut Down menu appears. Point at "Sleep" and click on this option. Your Windows 7 computer goes into sleep mode. Wake your computer from sleep mode by jiggling the mouse. There may be a delay of a few seconds before your hardware powers on. All of your open programs are still open and your work is intact, just as you left it before the computer entered sleep mode. Configure your Windows 7 PC to go into sleep mode automatically when it is not used for a certain amount of time. Click "Start" and select "Control Panel." Click "System and Security." Click "Power Options." A menu opens. Click on "Choose when the computer sleeps" and select the number of minutes of inactivity. You can also set a separate time interval to put your monitor into sleep mode. If you set both to 10 minutes, then your PC and monitor will automatically go into sleep mode after 10 minutes of inactivity

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I unplugged my computer and turned off the monitor to save power since we were not using. Now with the computer plugged in, when I turn monitor on the green light just blinks.


Make sure the data plug is in correctly. Turn the computer on. No you can try using the power button on the monitor to power it off and on. Or you may need to pull the power for the monitor out of the plug and then put it back in.

The blinking light means the monitor is in sleep mode. They need activity on the data or signal cable before they wake up. Unfortunately sometimes they get stuck and you have to reboot them to wake them up. I have seen a few where they had failed and would not come out of sleep mode but that is pretty rare. Usually you just have to sweet talk it and threaten it a bit and pull it plug a few times and all of a sudden it will start up,

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Compac keyboard 1/4 moon key on model 5137, once I hit it, monitor went to sleep. I cannot wake it up. I have no password. I have unplugged and replugged entire system, I have tried every combo of keys...


Try holding in the power button on the computer for 30 seconds. wait 5 seconds then tap the power button again once and wait. also check that the monitors cables are securely connected to the computer.

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  • Hi, The Monitor as well the Computer have "Power Saving Modes," [Sleep, ScreenSavers, and Hibernation]; so what you want to do is "Change the way the Computer / Monitor Sleeps!" From the Desktop Screen, click on the "Start Button," next in the [Start Search Window], type: power. In the next [window] that opens, you should see, from your point of view; a "list" in the (left column) "Change when the computer sleep, the wording may be different, but it will be clear enough. Now all you have to do is change the way the Computer and Monitor "Sleep, or Turn-off." If the Monitor have its own "settings;" just find them by the [button on the monitor], and do the same thing as above; but I'm sure the computer will take care of both. If this solution to the problem was of help? Let me know by giving a "Helpful Rating", thanks, and have a "Great Memorial Day!"

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Unplug all the Cables from Compaq Presario 5103 CL and leave the Keyboard, mouse and monitor cable pluged in.

Now make sure the power cable of the monitor should be pluged in and the power cable of the tower should be pluged in.

Now to check if the montor is fine just unplug the video cable only which will show no input signal on the screen. If it shows this signal the monitor is fine. Plug back in the video cable.

If the monitor is going to sleep mode it might be possible that the old computer ( Compaq Presario 5103 CL ) is in stand by mode. hit any key on the keyboard and it should come back .

If it is not in the stand by mode then do one thing. Check the same monitor with the new computer. If it is working. Perfect ..!

Do one thing now ..!

Unplug all the cables from your old system and then press the power button for 30 sec and let it go. Now plug the keyboard, mouse and the monitor try again.
If it works Perfect. If not ..!

Then you need to open the tower and check on the processor FAN is it running..? If its not running you will not get the display as the fan is responsible for the display on the screen. Otherwise...!

Check the Tower possibly the Tower is not getting the power.

Try these steps and let me know If it works

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1 Answer

Monitor does awake from sleep mode


You need to check the inverter fuse, transistors, caps, solder joints. Please see my pictures here to get some ideas so you will know what to look for inside.
http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

Please post back.

Replacement board: http://www.lcdrepair.us

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This monitor refuses to wake up because it cannot find the signal from the computer.

When the light is amber, force the pc to shut down by holding the power button until all lights go off. Then, after about 10 seconds, power the pc back up again.

If this does not start your monitor, unplug all the monitors connections and plug them back in again. These things should reform the connection from the pc to the monitor.

good luck
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Next time you reset, check both the monitor settings and your BIOS settings for wake up

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