Monochron display weak
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Monochron display weak

by Menno on Sat Mar 09, 2013 11:23 am

I've got the kit some weeks ago, i soldered it all test where ok (voltage, beep ,led)
But the screen is very weak, not quite readable , i tried very settings but no change, checked the soldering redo some no change
do you have a solution ?
Thanks Menno
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Re: Monochron display weak

by Menno on Sat Mar 09, 2013 11:35 am

here some photo's
Attachments
print2.jpg
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print1.jpg
print1.jpg (58.03 KiB) Viewed 1075 times
scherm1.jpg
scherm1.jpg (35.46 KiB) Viewed 1075 times
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Re: Monochron display weak

by Menno on Sat Mar 09, 2013 11:37 am

some more photo's
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print 3.jpg
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print3.jpg
print3.jpg (94.22 KiB) Viewed 1075 times
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Re: Monochron display weak

by Menno on Mon Mar 18, 2013 7:30 am

Nobody ???

Please anybody ??
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Re: Monochron display weak

by adafruit_support_bill on Mon Mar 18, 2013 7:35 am

Sorry we missed your first post. Since you replied to it yourself, it didn't show up in out list of "unanswered posts".

Your soldering looks good. Check the voltages again with the display installed to make sure they are still in the right range.
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Re: Monochron display weak

by Menno on Mon Mar 25, 2013 10:07 am

Thanx for your reply
The voltage is 5,01

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Re: Monochron display weak

by adafruit_support_bill on Mon Mar 25, 2013 10:27 am

Have you tried adjusting the trim-pot?
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Re: Monochron display weak

by Menno on Mon Mar 25, 2013 3:05 pm

yes it's gives me on a half a millimeter maximum visibility
it's to dark or to bright just at one point it gives what you see
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Re: Monochron display weak

by adafruit_support_bill on Mon Mar 25, 2013 3:51 pm

If I understand what you are saying, it goes from too dark to too light with nothing in between?

It sounds like you may have a defective trim-pot. If you contact support@adafruit.com with a link to this thread we can send you another trim-pot.
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Re: Monochron display weak

by Menno on Sun Apr 21, 2013 10:47 am

Thanks for the new 10K trim potentiometer
I've fond finally some time to solder it.
I measured the old en new before i soldered the new one.
They gave the same result on the meter.
So , as i thought no better result, still at one point i've got visabillity, a hair too the right or left gives you a black or too bright screen.
I've looked at the site http://www.ladyada.net/make/monochron/newclock.html
they are all so bright and crisp on the screen, even your foto.
I can't get it so neat
I am eager to hear and try the next possible solution

Thanx
Menno Damsma
Netherlands
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Re: Monochron display weak

by adafruit_support_bill on Sun Apr 21, 2013 11:09 am

These displays are normally quite bright and crisp. In the photos, I can't see the soldering for the contrast circuit. Double check all those joints and re-touch any that do not look smooth and shiny. The rest of your solder looks quite good from what I can see.

If you still can't get a good image, contact support@adafruit.com with a link to this thread and we can send you another display.
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Re: Monochron display weak

by Menno on Sun Apr 21, 2013 6:50 pm

Oke
so that we are clear where is the contrast circuit ?
so that i can particaly re do them
Thanks
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Re: Monochron display weak

by adafruit_support_bill on Sun Apr 21, 2013 7:22 pm

The contrast circuit is as in the diagram below. It includes pin 3, pin 18 and the pins of the contrast potentiometer.

Image
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Re: Monochron display weak

by Menno on Mon Apr 22, 2013 5:02 am

Oke Thanks,

I've redo them
Set the backlight on 16
and see the foto's this is the max i can get, and the room have to be blinded.
So this is it or is the display defect?
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redone .JPG
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Re: Monochron display weak

by adafruit_support_bill on Mon Apr 22, 2013 6:30 am

Yes. I think you have a bad display. Contact support@adafruit.com with a link to this thread.
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