Remove or reduce a screen noise

Discussion in 'Palm' started by junglemike, Jul 11, 2004.

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  1. junglemike

    junglemike Mobile Deity

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    Hi everyone. You hear this high pitched noise from you pda screen? In some cases this noise can be really distorbing.
    I cannot read for a long in silence because the noise drives me crazy.
    OK, so Opening my zire71 once again (i opened it at least some 100 times) i tried to look for the problem and if it is possible - to solve it.
    Anyway, i do NOT recommend following these steps, consider them as demostration only. First , if your device is under warranty -

    PalmOne DOES replace the units this the abovementioned defect. Also this operation is very risky, you can destroy your screen of whole

    pda in second. Anyway, here's the process:
    _MY_ zire looks a little bit different from inside :), but it shouldn't bother you , it's not related to the problem anyway.
    OK, so let's open Zire71:
    [​IMG]
    After removing the blue protective plastic it looks like this:

    [​IMG]
    Next stage: - pull out the main board and unplug the cable which connects board to screen electronics.:

    [​IMG]
    Well, after experimentig a little i found out that nois is NOT coming from this small pcb on the creen. I tried listening the this small pcb from

    both sides. No noise. The nois is also has notheing to do with backlight. Look at the previous picture. The most left small connector - is a

    backlight. After disconnecting it - noise continues as before. Nois is coming from the surface of the screen itself and almost zero at the

    screen's back. So let's unplug the screen itself:
    [​IMG]

    Thisi is how it looks from the side. The bottom lair - is a digitizer which registeres your taps.
    [​IMG]
    The digitizer in all such Transflective screens is soft, unlike previous palm V , VX, and palm III, also other models.
    After experimenting a while with digitizer i found out that if you raise a digitizer just a little bit - 1/3 of mm - the noise almost stops.

    I had to experiment powering the unit in disassambled condition , which is a bit risky:
    [​IMG]
    Ok, so let's eject the digitizer very carefully:
    [​IMG]
     
  2. junglemike

    junglemike Mobile Deity

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    [​IMG]
    After completely removing the digitizer, the picture looks like this:
    [​IMG]
    Than let's cover the screen with regular FOIL, all of the perimeter, including graffiti area.
    [​IMG]
    When finished, it looks like this:
    [​IMG]
    Now put the digitizer back, you can even notice, that in the left bottom corner part of foil can bee seen. Don't worry, you will not
    see it in assembled state.
    [​IMG]
    Let's connect the screen and check that everything is working.
    [​IMG]
    Assemble the screen again, by the way, i also put foil under the small pcb - just in case...
    [​IMG]
    After assembling everything back again - let's check that digitizer is working properly.
    [​IMG]
    Conclusion.
    To be honest, i must say, that nois is no Completely removed - but it is very silent and can be heard only when putting your ear near the

    screen.
     
  3. palmfetish

    palmfetish Mobile Deity

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    Very informative!
    My screen noise is only intermittent and I'm hardly in a place quiet enough where I'm bothered by it. I will experiment w/ an old 505 however. If your solution works on other models then it may be an easy fix for palmOne (I wonder why they havent figured it out?).

    Do you have another post detailing the battery modification? Whats the runtime per charge?
    Excellent work!
     
  4. junglemike

    junglemike Mobile Deity

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    Don't think it'll work for M5xx. It has different screen technology - Reflective. Also didn't hear of such buzzing problem on m5xx. Diigitizer there is not soft and maid of glass too.

    yes, see Here

    This modded battery works for about 20-25 hours on 100% brighness setting
    [​IMG]
     
  5. palmfetish

    palmfetish Mobile Deity

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    I laughed long and hard after looking at your mod w/ the large wood screws going through it. I see you're more concerned w/ results - thats good.

    Again, that was excellent work!
     
  6. zentro

    zentro member indeed

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    You could earn a wad at Palm - just send them an application containing links to your threads here at Brighthand!

    I love reading about your work and, of course, your avatar is great. Scary, but great nonetheless.

    Just thought of something: When you post something like this thread, maybe you should just post it in one forum and then post links to it in the others. This way all the follow-up posts will stay in the same thread which is very helpful for future reference.

    Keep up the good work!
     
  7. nicster

    nicster Newbie

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    I think I voided my warranty..cest la vie. Got it on sunday at the flea market ten dollar plus one each for sync and power.but oh my gaud the buzz ,gave it to a guy to listen to...and he didn`t hear a thing.I actually posted it on ebay and as I continued to surf I found this thread.well one thing leading to another,I killed the sale and gave it a shot.I probably bent the resistive sheet as I seperated it ,cause when i reassembumbled it the digitizer would take imput from a small region.nothin ventured nada gain.back to the VII.Actually the entertainment value of finding this thread made the whole thing , every penny and every frequency adjusting moment of the tungsten adventure wellspent.
    Ranks close 2nd to that post awhile back by the guy who got an apple g5 for christmas and swapped out mobos to a x86 gammer.The mac users went NUTS. PPS It still buzzed when reassembled. if you held touchscreen away from display no noise from either .but when over layed they sing.
     

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