Question about NEC MobilePro 900 Handheld

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NEC MobilePro 900 lines in display

I purchased a used NEC MobilePro and, after trying it out by playing a game of Solitaire on it, vertical lines appeared, within 5 minutes, in the display after exiting the game. I have fully charged the unit overnight, replaced the backup battery with a new one, and have tried adjusting the display every way I could find to no avail. These weird vertical lines are lighter in the center of the screen and are red and green in color, and act like they are almost flickering. Going outward from the center, the lines go to black in color. The unit works great otherwise and I would like to keep it (I could possibly get a refund) if I can get someone's help in fixing the display (it is very difficult to see anything now on the screen). Thank you!

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It is probably due to loose ribbon connector that connects screen(top) to the motherboard(bottom). Try tapping the right hinge first.
Else (make sure to backup the computer before) examining this exposed ribbon connector under the right hinge, and depending upon how far one's knowledge and skill allows to go, by unseating and reseating this ribbon should take care of this situation. Very careful. Getting here could be fatal if not done right.

Posted on Jan 01, 2008


The problem is most likely the LCD is dying

Posted on Jun 16, 2007


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Posted on Jan 02, 2017

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I cannot get my nec mobile pro 900 to sync with my laptop i downloaded activesync from: i downloaded...

Which one did you do first: Did you install ActiveSync 4.5 first, or did you try installing the driver first?

The best way to do this is as follows:

  1. Download and install ActiveSync (4.5 is what i use both at home and work and it works great with the NEC 900 and 900C's.
  2. Restart your Windows XP Machine (I assume you don't have Vista)
  3. Next, follow the instructions for the installing the NEC 900 usb drivers (these drivers should be installed AFTER installing ActiveSync... (it seems to work that way without problems for me).
  4. Next, restart your xp machine again.
  5. Now, connect your NEC MobilePro 900 to your Windows XP machine, and it should perform smoothly.
If this does not work for you, you can contact the folks at, they sell and repair, as well as provide support for these machines.

Hope this helps

Apr 17, 2009 | NEC MobilePro 900 Handheld

2 Answers

Display problem on NEC MobilePro 900

I just bought a 900C on eBay and had the same problem. According to the seller "the video cable on the right under the hinge cover gets loose..if its reseated it will be could just press on the bottom of the hinge cover right and it will make it go away but best to reseat the cable." I haven't tried his solution yet. Mine seems to intermittent since it is working fine right now.

May 30, 2007 | NEC MobilePro 900 Handheld

1 Answer

Error message "Backup Battery Very Low"

The MobilePro 900 back up battery is low and should be replaced. The battery is a CR2032 coin-cell battery, which is very common and can be purchased at most department and drug stores. Refer to section 1-7 of the "MobilePro 900 Handheld PC's User's Guide" for detailed replacement instructions.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Hard reset???

Warning: This procedure will ERASE all user data stored on the MobilePro 900. Make sure you have backed up all data before doing the following. To hard reset your MobilePro 900, simply remove both the main and back up batteries for 60 seconds. For detailed instructions on performing a hard-reset:

Sep 14, 2005 | NEC MobilePro 900 Handheld

2 Answers

Ctrl+ALT+Del does not launch Task Manager on my MobilePro 900, why?

The Ctrl-alt-del short cut to the Task Manager is not on the MobilePro 900. To bring up Task Manager on the MobilePro 900, hold the "Alt" key and then tap the task bar with the stylus simultaneously. A menu with "Task Manager" and "Properties" will be displayed, select Task Manager.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

MobilePro 900 turn on during the night and not shut back off

Devices running Windows CE 3.0 turn on at midnight to search for appointments for the coming day. Reminders are set and the Today view is updated with the day's events. The device is supposed to turn off after three minutes of inactivity. If a program is running the unit may not turn off because there is activity. The following applications are known to cause problems: * Windows Media player for Pocket PC. * Active Sync * Wireless LAN adaptors NEC has developed a registry patch that has been tested on the following LAN cards. Device Vendor Driver Cisco Aironet 340 Cisco 2.30.11 Cisco Aironet 350 Cisco 2.30.11 Linksys WPC11 Ver 3 Linksys 1.07.29 Orinoco Orinoco 1.02 3CRWE737A 3 Com LA4137 Wireless Network Symbol N/A For additional information see Microsoft Knowledge Base Article – 263719 Click here to download the Power Management update utility. Installation procedure. Note: Anytime a “hard reset” is performed on the MobilePro 900 the Power Management update utility needs to be re-applied. 1. Download the Power Management update utility to local system. 2. Copy the Pwr_Mgt.exe file to the MobilePro 900 desktop. 3. Double tap the NEC Icon. 4. Click OK. 5. With power on momentary depress the “soft reset” on the bottom using the stylus. 6. Delete the NEC Icon on the desktop.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Hard reset

Note: It may be necessary to depress the power button more than once to properly initialize the power management circuitry before the unit comes on. Note: It may be necessary to connect AC power to the unit and allow it to charge before attempting to apply power. The unit will not power up if the battery voltage is below a safe operating level. Please refer to the leaflet "NEC MobilePro 900, Performing a Hard Reset" that was shipped with the unit for the procedure to perform a hard reset on your MobilePro 900.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Jack for the external microphone

There is an error in the MobilePro 900 manual (Pages 2-2 and 2-3). The jack on the front of the MobilePro 900 is a stereo headphone jack only. The MobilePro 900 has a built in microphone. There is no jack for attaching an external microphone.

Sep 14, 2005 | NEC MobilePro 900 Handheld

1 Answer

Coin cell backup battery

No the coin cell backup battery is not rechargeable. If the MobilePro 900 back up battery is low it should be replaced. The battery is a CR2032 coin-cell battery, which is very common and can be purchased at most department and drug stores. Refer to section 1-7 of the “MobilePro 900 Handheld PC’s User’s Guide” for detailed replacement instructions.

Sep 14, 2005 | NEC MobilePro 900 Handheld

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