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LCD Blemishes

Performance, hardware, software, general buying and gaming discussion..
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mark-ibmtp
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Joined: Mon Aug 22, 2011 5:59 pm
Location: Phillipsburg, NJ

LCD Blemishes

#1 Post by mark-ibmtp » Sat Aug 27, 2011 12:15 pm

By LCD blemishes, I mean dark/dim spots on the display, specifically NOT including:

* broken pixels,
* dirt/stains on the front (outer) surface,
* backlight malfunction, or
* mechanical "pinch effects" (LCD response to pressure) such as are often seen at one or more corners.

The kind I mean are irregularly shaped blotches, usually with varying shading (gradations of darkening within the blotch). As someone who has bought a lot of used/refurbished Thinkpads over the years, I have seen these a number of times. I just got a T43 with a nice UXGA, but with a quite dark blotch shaped not unlike a candle flame, several millimeters tall.

Sometimes these seem to be dirt/contamination between the various layers, and sometimes mechanical dents (broad but not vary dark blotches with smooth gradation of shading). But I suppose there are other causes as well.

I would be grateful if any LCD gurus on the forum can advise about:

* diagnosing the cause of blemishes
* if it is practical to fix them, how to do it

Thanks!

Harryc
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Re: LCD Blemishes

#2 Post by Harryc » Sat Aug 27, 2011 3:26 pm

Without seeing a picture of the actual blemish, I'd guess it was dust based on your description. FWIW, I have never seen anyone here report success in attempting to 'fix' that. I recall one post where it was attempted and failed. Assuming it could be cleaned, the major factor in taking an LCD that far apart is introducing more dust.

ajkula66
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Location: Belgrade, Serbia

Re: LCD Blemishes

#3 Post by ajkula66 » Sat Aug 27, 2011 11:44 pm

If the "candlelight" effect is in the corners of the screen, that's a backlight past its prime, extremely common on ID Tech UXGA panels.

If not, I'm with Harry...attempting to remove dust specs will likely have a destroyed panel as the end result.
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)

Cheers,

George (your grouchy retired FlexView farmer)

One FlexView to rule them all: A31p

Abused daily: T520, X200s


PMs requesting personal tech support will be ignored.

bugmn
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Joined: Tue Jun 14, 2011 9:03 am
Location: Italy.

Re: LCD Blemishes

#4 Post by bugmn » Tue Aug 30, 2011 10:32 am

I've only seen this once, on a used LCD screen I bought from eBay. My guess is that someone pressed their thumb really hard against the screen, causing permanent damage

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