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Author Topic: jittering pointer  (Read 67650 times)
wei803
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« on: January 27, 2007, 10:19:47 AM »

When I test my striped Intuos3 with bare LCD panel (difuser + protector + backlid, no metal) on top. The mouse pointer seem to jitter non-stop when i move it with the pen. Any one have this problem? How you overcome it?  Embarrassed
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Drewid
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« Reply #1 on: January 27, 2007, 11:35:45 AM »

Lots of people get this. It's probably to do with the inverter driving the backlights.
Try disconnecting the backlight, does that make a difference?
 
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wei803
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« Reply #2 on: January 27, 2007, 03:13:14 PM »

No hope Sad
I've tried unplug the CCFL and the inverter board, still the same. Embarrassed
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Drewid
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« Reply #3 on: January 27, 2007, 03:41:02 PM »

So it might be tha power supply.  Have you tried moving it?
OR it might be that the shield under the sensor is not touching it's grounding springs, (on the wacom output board).
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Drewid
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« Reply #4 on: January 27, 2007, 03:42:31 PM »

You could also try different settings in the Wacom drivers.  Standard Wacoms sometimes suffer from this as well.
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wei803
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« Reply #5 on: January 27, 2007, 04:04:15 PM »

I've put the tablet back to the casing. It works fine as long as the screen is off. My LCD come with external powersupply, it's 2 feet away when I do the test.
I suspect the culprit is the circuit for the LCD. Will test further to see is it's help to hide it at the back.
Currently i just put everything flat on the floor.
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Tanassi
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« Reply #6 on: January 27, 2007, 06:22:07 PM »

Hi Wei and everybody

try also to change the refresh timing on the monitor, may be your graphicboard can generate a range of frequencies between 60 and 85 Hz or more.
i have noticed with some CRT monitors that my intuos dislike 75Hz that cause a greater jitter then 60 or 85 Hz (at the same distance from the monitor).
i guess that if the refresh frequecy of the monitor is near to the resonance frequency (or a multiple/submultiple) of the system tablet+pen, this can cause more interference (=jitter)
my two cents Cheesy

bye... Vince
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dynam1c
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« Reply #7 on: January 27, 2007, 07:18:36 PM »

When I stripped my monitor I got the probelm however, when it was semi nude there was no problem, so I had a look inside. it turns out the the circuit boards etc where all gaurded by a thin aluminium ( I assume it was alluminium) sheet, held in place with tape and a little bit of glue.

This may reduce the shacking.. or its the fact that your cold and your hands shaking !!
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wei803
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« Reply #8 on: January 28, 2007, 11:00:21 AM »

Thanks for the reply guys. Tried changing to other resolution and refresh rate, still the same Sad
Extended the signal cable, same thing. My LCD is how naked no metal shield attach. I'm using a very long VGA cable, around 10m, not sure is that the culprit. What else I should look into huh?
« Last Edit: January 28, 2007, 11:03:43 AM by wei803 » Logged
wei803
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« Reply #9 on: January 29, 2007, 02:49:31 AM »

Ok, here's what I can think off that might cause the problem...
- The circuit powering the LCD.
- The circuit that's on the LCD horizontal & vertical side.
- VGA cable too long.
- Other attached accessories.
- Power source unstable.

Anything to add to the list guys?
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Drewid
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« Reply #10 on: January 29, 2007, 08:29:05 AM »

A circuit being in the wrong place/wrong way round. Generated magnetic fields are directional, try turning the inverter 90 degrees in different directions
A circuit being unshielded.    Try it underneath the metal foil behind the tablet (with something to stop shortcircuits ).
Magnetic field from the inverter being at just the wrong frequency.


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wei803
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« Reply #11 on: January 29, 2007, 08:38:34 AM »

thanks Drew, you guys rocks. Will keep trying! Never give up!!!
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Chems
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« Reply #12 on: January 29, 2007, 02:22:37 PM »

Have you got a carpeted floor? You said your laying it on the floor. Try it on a table or something maybe some static or something is messing up the pen when the LCD is on. The Original Wacom casing has the big metal plating to protect against that.
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wei803
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« Reply #13 on: January 29, 2007, 03:02:38 PM »

Hi, I've tried it on the floor, table and bed. Same thing.
I just tried it with the circuit underneath, flipped the screen over, no luck.
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Chems
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« Reply #14 on: January 29, 2007, 03:16:23 PM »

How about your mobile phone is that nearby? In your pocket. They produce a nice pulse when just on standby.
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