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Old 01-09-2009, 06:55 PM   #1 (permalink)
bhw
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Default Trackball select very hard push required

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I've cleaned the trackball and it works moderately ok to move around the screen, but pushing to select has become harder. The little metal tab on the bottom of the button assembly is okay. The button on the mother board takes a lot of pressure to make it activate. I tried pushing it with another object and it just requires a hard push to make it respond. Any way to adjust that or am I stuck with it as it is.
Thanks,
Bruce
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Old 01-09-2009, 06:59 PM   #2 (permalink)
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Originally Posted by bhw View Post
I've cleaned the trackball and it works moderately ok to move around the screen, but pushing to select has become harder. The little metal tab on the bottom of the button assembly is okay. The button on the mother board takes a lot of pressure to make it activate. I tried pushing it with another object and it just requires a hard push to make it respond. Any way to adjust that or am I stuck with it as it is.
Thanks,
Bruce
My suggestions is only that and do so at your own risk. My guess is there is corrosion between the metal tab and the contact on the circuit board. if you take your battery out, remove the trackball and CAREFULLY pry the tab up just enough to look under you can probably take a small metal object and scrap it off the contact, do not touch anything but the contact itself.

I have done this on a friends phone to correct the same issue.

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Old 01-09-2009, 07:14 PM   #3 (permalink)
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Default metal contact

Do you mean pry up the contact that is on the Mother Board and underneath it may be corroded? Or are you referring to the metal tab on the trackball assembly.
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Old 01-31-2009, 09:20 AM   #4 (permalink)
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I have noticed that using a sharp screwdriver on the metal tab under the trackball directly on the motherboard, the selecting feature is working again.

do you really say to pry up that metal tab and clean underneath it, between it and the motherboard it self?

thank you.
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Old 01-31-2009, 10:17 AM   #5 (permalink)
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Default button on board

I was able to lift the button off of the motherboard by careful use of a scalpel blade. the "button is a domed piece of thin plastic with a metal contact in the dome and another metal contact on the motherboard. Both contacts were perfectly clean and free of corrosion. Therefore the problem is in the structure of the plastic button portion or there is yet another contact below the first set that has a problem. In any case, I have no other ideas and am giving up on fixing this.
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Old 01-31-2009, 11:13 AM   #6 (permalink)
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Ok, here is the final fix! I already made it on my device while waiting for some replies, and it worked good! ;)

The problem is the copper push plate underneath the trackball that is placed directly onto the motherboard of the device.

The problem is that underneath this plate there must be some corrosion or some kind of dust or some glue slipped due to the heat of the device (you'll understand why the presence of glue by reading ahead in the post).

In my device there was some glue and some corrosion!

The part we are talking about is a little black plastic square with a round metal plate in the centre.
This square is placed at the centre of the 4 leds and 4 trackball sensors.
The round plate we need to clean is placed up on the plastic base and is keeped still with a light brown square tape that is glued on to of all (there goes the glue!).


Here is what you need to do:
  1. turn off the device and remove the battery, the sim card and the memory card (if used).
  2. disassemble the 8100 so to reach the motherboard easly (8100 Disassembly photos and instructions).
  3. from just one corner of the base and with a sharp knife CAREFULLY pry the tape up so to reach the plate and pry up that too -- as you could see the plate is only touching the black square base and is keeped still by been glued at the tape on top of the base.
  4. remove the plate from the tape WITHOUT removing complitely the tape from the square plastic base -- just slip the plate away from underneath the tape.
  5. now act on the plate with a small metal object and scrap off everything you have underneath it -- you must act unlit you see the plate as clear as possible -- it does not matter if you scratch the metal of the plate because it will work anyway -- JUST DON'T BEND IT!!!
  6. when finished, just clean the base contacts with a really clean piece of paper and finally blow air on it with your mouth just to remove the dust -- there sould be no dust between the plate and the base!!
  7. replace the plate underneath the tape and up on the black square base in the same position as it was before -- just centre the base!!!
  8. replace down the light brown tape and check if it glues back on the base corner from wich you lift it up -- instead NOT just use a little piece of black tape on the corner and on any other corner that does not glue any more.

That's it!! now it should work. It took me about 15 minutes to do everything (same time as writing this post!)

Hope this could help.
Thank you all.
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Old 05-06-2009, 04:22 PM   #7 (permalink)
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Thanks for the post. Although I clean my trackball regularly, I would have never known that on the mother board was just a taped on piece of metal.

Anyway, just an FYI... you don't need to disassemble entire unit to do this fix. Of course if it is, it may be easier... but not required.
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