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Old 01-05-2012, 03:47 PM   #1
medvedev
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Unhappy Boox M92 with defective pixels

Hello,
I mentioned that my M92 has an strange Pixel Error:
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The same picture but with inverted colors
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This 3 grey Pixels accur only when some surrounding pixels are black and some others white.
Normaly I can't see this error but sometimes small letters gets defaced a little bit.

Does an E Ink display has Pixel Fault Classes like an LCD?
Can I replace the device? I bought it from Booxtor.

Thanks
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Old 01-05-2012, 05:52 PM   #2
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You'd have to ask Booxtor. Looks certainly defective to me, they don't change their state.

Question - is this a simple checkboard pattern with pixels? Looks like a good idea to use when checking the device in a store.
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Old 01-06-2012, 03:23 AM   #3
medvedev
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Originally Posted by kamizase View Post
Question - is this a simple checkboard pattern with pixels? Looks like a good idea to use when checking the device in a store.
Yes, I like 1px chessboards for looking for dead pixels, because then dead pixels looks bigger.

If you switch on the M92 then a chessboard automatically appear while booting.
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Old 01-06-2012, 06:05 AM   #4
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Quote:
Originally Posted by medvedev View Post
Hello,
I mentioned that my M92 has an strange Pixel Error:
...
Can I replace the device? I bought it from Booxtor.

Thanks
Hi,

as soon as the new batch of M92 has arrived (in two weeks) I will replace your device.
Thanks for positive review in the store!
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Old 01-06-2012, 09:10 AM   #5
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That kind of customer service gets my vote. My DR800S's screen died completely a few days ago and I was looking for a replacement.

Hope you ordered a lot of them :)
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Old 01-06-2012, 11:08 AM   #6
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Quote:
Originally Posted by Booxtor View Post
Hi,

as soon as the new batch of M92 has arrived (in two weeks) I will replace your device.
Thanks for positive review in the store!
Too bad you are not in North America, I will buy from you in an instant. That's exemplary customer service
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Old 01-06-2012, 03:04 PM   #7
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I have the same problem (also bought from booxtor); I wonder how frequent it is.
Here are pictures of my dead pixel (the first is a bit off focus; the checkerboard is 2x2 pixels, so the dead spot is rather large)
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Last edited by psv; 01-06-2012 at 03:26 PM.
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Old 01-06-2012, 05:01 PM   #8
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here is the dead spot with 1px checkerboard
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Old 01-06-2012, 09:24 PM   #9
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can either of you give us a pic of the whole display indicating where the dead pixels are?

damn i wish i was going to CES this year...

we should check with Nate the Great and give him the pics and see if he can run down an Eink rep....
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Old 01-07-2012, 09:30 AM   #10
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can either of you give us a pic of the whole display indicating where the dead pixels are?
here it is (sorry for blurred picture)
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Old 01-07-2012, 09:42 AM   #11
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here it is (sorry for blurred picture)
This could be connected with the magnetic fields from the speaker, as I heard of about the previous M-models.
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Old 01-07-2012, 10:19 AM   #12
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That would be horrible, it would be ridiculous to fix one problem and create another...
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Old 01-07-2012, 12:18 PM   #13
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That was a whole different problem, with the digitizer, not the screen itself.
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Old 01-07-2012, 09:17 PM   #14
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eink is not effected by magnetic fields from simple speaker magnets. it would take a much more powerful magnetic field to interrupt the refresh of the pixels
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Old 01-08-2012, 05:47 AM   #15
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It's still suspiciously close to the speaker on the backside.

@medvedev: Can you please post an image like psv from your whole display?
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