Trackball on 8320 won't scroll down

hi Titchypink.
this is all i could find out,hope it helps you out.
Trackpad, trackball, or keyboard not working on a BlackBerry smartphone running BlackBerry OS 7.1 and earlier Article Number: 000029640 First Published: April 26, 2017 Last Modified: April 26, 2017 Type: Support

Environment

• BlackBerry smartphones running BlackBerry OS version 6 to 7.1
• BlackBerry smartphones running BlackBerry Device Software 5.0

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Overview

In some situations, a BlackBerry smartphone with a trackpad or trackball may experience issues with sensitivity, latency, or scrolling. Additionally, the BlackBerry smartphone keyboard, or other buttons may be unresponsive.
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Cause

This issue might be caused by one of the following:

1. The trackball/trackpad sensitivity needs to be adjusted.
2. Make sure the trackball/trackpad is not affected by a software freeze or an application freezing.
3. The BlackBerry Device Software is out of date and requires an update to resolve the trackpad, trackball or keyboard issue.
4. The physical trackpad, trackball or keyboard hardware is malfunctioning.

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Resolution

Resolution for Cause 1
Complete the steps in Article 5447 to ensure the trackball/trackpad sensitivity is correctly.
Resolution for Cause 2
For BlackBerry smartphones running BlackBerry OS version 6 to 7.1 using a trackpad, complete the following:

1. From the Home screen, select Options.
2. Select Typing and Language.
3. Select Trackpad Sensitivity.
4. Ensure Audible Roll is selected.
5. Rapidly roll the trackpad up, down, right, and left.
6. If an audible click is heard while not responding, proceed to Resolution for Cause 4 as this could be a software related problem.

For BlackBerry smartphones running BlackBerry Device Software 5.0 using a trackball, complete the following:

1. From the Home screen, select Options.
2. Select Screen/Keyboard.
3. Ensure Trackball Audible Roll is selected.
4. Rapidly roll the trackball up, down, right, and left.
5. If an audible click is heard while not responding, proceed to Resolution 4 as this could be a software related problem.
6. If an audible click is not heard, the problem may be related to a hardware issue. Please contact the wireless service provider for additional steps.

If an audible click is not heard, the problem may be related to a hardware issue. Please contact the wireless service provider for additional steps.
Resolution for Cause 3
To update BlackBerry Device Software using BlackBerry Desktop Software see, Article 11320.
or
To update the BlackBerry Device Software on the BlackBerry smartphone visit http://www.blackberry.com/update/
Resolution for Cause 4
Use the BlackBerry Virtual Expert diagnostics application. For more information, see Article 35973.if not try this link. blackberry scroll pad is not working Google Search

The trackball is easily removed for cleaning by just pulling the trim ring around the trackball off with your fingernail. Remove the trackball and clean with alcohol. Reverse the process to clean.

no need to replace or disassemble the blackberry trackball. You can do it from outside of blackberry. Just follow the cleaning trick at http://www.unique-stuff.co.cc/fixing_sticky_blackberry_trackball.html

Very recommended..

Hi. BlackBerry smartphone trackball fails to roll in a particular direction because, debris is lodged in the trackball.
The trackball user interface found on certain BlackBerry smartphones is similar to the trackball used in a mouse in a desktop computer.
Using for certain period debris comes in contact with the trackball and affects the usability of the BlackBerry smartphone, rapidly roll the trackball up, down, left, or right to potentially correct the problem.
If rapidly rolling the trackball does not correct the problem, please contact your wireless service provider for support options.
I hope this information will be helpfull.

Hi,

Please select Options from the Main Menu
then click on Screen/Keyboard
then scroll down till you get Trackball, just below that you will find
Horizon Sensitivity &
Vertical Sensitivity, please increase the numbers then Save and check the effect.

If you still face the same problem you need to take the Handset to the nearest Service centre and get it checked cause it could be the problem with the Trackball itself.

Thank You.

Hi,
1) Try to re-install the BlackBerry® Device Software using the application loader tool, before you re-install the software please back up the BlackBerry smartphone data.
2) The trackball user interface found on certain BlackBerry smartphones is similar to the trackball used in a mouse in conjunction with a desktop computer. In the event debris comes in contact with the trackball and affects the usability of the BlackBerry smartphone, rapidly roll the trackball up, down, left, or right to potentially correct the problem. If rapidly rolling the trackball does not correct the problem, please contact your wireless service provider for support options.

It has been in my experience with the 8100 that if you can't scroll a certain direction, there was debris on the roller preventing it from registering the roll. Turn the phone off, press down on the track ball (as if to press a button) roll the ball down (in your case). This may help dislodge whatever debris is caught in the roller. It has worked for me several times. You may want to try and clean the trackball as well with some rubbing alcohol and a q-tip.

If it were a software problem, then I would imagine you turning off the phone (battery pull) would clear this up anyways.

Best Regards,
Bill

Have you removed the ball at any time? If it is put back in wrong, it could cause this. If not, the ball assembly itself might be bad. You can find them fairly cheap on eBay.

Please change the sensitivity, to change the sensitivity follow the below steps

1. select option in the main menu
2. select Screen Keyboard
3. set the horizontal/vertical sensitivity as 100%

This is usually caused by the trackball getting dirty.

Use a q-tip dipped in IPA and clean it. Roll the trackball around and swab the q-tip around to clean.

If cleaning fails then you will need to replace the Blackberry trackball.

Check the following link on instructions on how to do that.

Blackberry 8800 Trackball Replacement Guide