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Thread: My solution to Auto Power ON Lilliput screen

  1. #201
    FLAC
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    Ooh! Thank you! Please post (many) pictures!
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  2. #202
    Low Bitrate
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    the board is mounted on the back of the casing. second photo shows the whole board and 1st is how I soldered the resistor and capacitor -- the original resistor was removed. 3rd image shows where I grounded the cap on the back side.
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  3. #203
    Variable Bitrate looneeii's Avatar
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    Very nice, thanks
    99 Grand Prix Grand Tigress
    HW
    Liliput 8in TS
    845GVD MITX w/ 2.4 Mobile P4M (478 MB)
    60GB 2.5" HDD
    MS MN-710 WifiG
    BT Deluo lite GPS
    IrDa PS/2 Keyboard
    SW:
    Win XP SP2
    RR
    IGuidance 4.0
    Zots day skin
    Proscan 4.0
    (100% Complete!)

  4. #204
    Maximum Bitrate fantomas's Avatar
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    do the lights on the bottom stay on constantly now for the 8" as well?
    rebuilding carpc... kinda..

  5. #205
    FLAC
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    Quote Originally Posted by ming
    the board is mounted on the back of the casing. second photo shows the whole board and 1st is how I soldered the resistor and capacitor -- the original resistor was removed. 3rd image shows where I grounded the cap on the back side.
    What size cap / resistor did you go with? Ok - I know I could work out the resistor by digging up the details on how the color code but I'm sure you won't mind letting me take the easy way out by telling me .
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  6. #206
    Raw Wave shotgunefx's Avatar
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    Any specific reason to use an electrolyte cap as opposed to a non-polarized mylar or more rugged Tantalum cap?

  7. #207
    Low Bitrate
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    I used values in coyote's post -- 150k resistor and 10uF cap. I didn't pay attention to what type of cap, but for 10uF probably Al electrolytic ones are most common and cheap, I got a 20 assortment pack from radioshack for $4.29.

    I think the button lights work as they should be, but I didn't pay much attention to that.

  8. #208
    FLAC
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    Its a different mod for the lights.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  9. #209
    phc
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    Quote Originally Posted by shotgunefx
    Any specific reason to use an electrolyte cap as opposed to a non-polarized mylar or more rugged Tantalum cap?
    Capacitor selection depends on many factors, Tantalums are great for voltage regulation to supress high frequency oscillations and have low ESR. Film caps are good for high voltage spikes, low leakage, etc..

    In the case of the lilliput, you have a 5V signal that you are trying to delay. Super low frequency, super low voltage. No need to spec anything but a cheap-*** aluminum electrolytic, rated to 6.3V.

    I use a 150uF, in combination with the on-board 10K-ohm resistor, giving you an RC value equal to a 150 k-ohm resistor with 10 uF cap.

    23 cents at digikey

    http://rocky.digikey.com/scripts/Pro...&M=UHE0J151MDD

    Putting in a more expensive capacitor won't make it work any better.

  10. #210
    Raw Wave shotgunefx's Avatar
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    Thanks for the answer. I'll probably use the tantalums as I have tons of them.

    Quote Originally Posted by phc
    Capacitor selection depends on many factors, Tantalums are great for voltage regulation to supress high frequency oscillations and have low ESR. Film caps are good for high voltage spikes, low leakage, etc..

    In the case of the lilliput, you have a 5V signal that you are trying to delay. Super low frequency, super low voltage. No need to spec anything but a cheap-*** aluminum electrolytic, rated to 6.3V.

    I use a 150uF, in combination with the on-board 10K-ohm resistor, giving you an RC value equal to a 150 k-ohm resistor with 10 uF cap.

    23 cents at digikey

    http://rocky.digikey.com/scripts/Pro...&M=UHE0J151MDD

    Putting in a more expensive capacitor won't make it work any better.

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