The Museum of HP Calculators

HP Forum Archive 19

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hp 30b LCD Rainbow mark
Message #1 Posted by JoeGeller on 16 Sept 2010, 2:22 p.m.

When my new hp 30B is viewed at normal angles from a desktop I get a rainbow pattern in part of the display. It is much more dominant in lower light. In dim office light, the mark reduces to a gray darkened half circle. In bright light it sometimes is not visible. There is no visible crack or break in the display.

See pics at http://www.flickr.com/photos/28209719@N00/sets/72157624845312599/

It was an eBay buy, but the hp 30b was new in a sealed package. (4CY02400091) There was no visible damage to the package before it was opened.

Otherwise, the calculator works fine. The numbers are always visible, but sometimes the rainbow/gray area is annoying.

Is it a damaged LCD? Have others seen this on an hp 30B ?

      
Re: hp 30b LCD Rainbow mark
Message #2 Posted by Martin Pinckney on 16 Sept 2010, 2:40 p.m.,
in response to message #1 by JoeGeller

You can get this effect on any LCD screen if you apply pressure directly to the screen. I wonder if the LCD on your 30b is somehow stressed by a warped case or something like that?

      
Re: hp 30b LCD Rainbow mark
Message #3 Posted by Raymond Del Tondo on 16 Sept 2010, 3:19 p.m.,
in response to message #1 by JoeGeller

Yes, the LCD cover of the brand new 30b I had for a few days showed the same rainbow effect. The unit had not suffered any stress. It's a production/material design problem, similar to that of the early 49g units. Someone tried to save some money at the wrong place...

            
Re: hp 30b LCD Rainbow mark
Message #4 Posted by Giovanni Jimenez on 16 Sept 2010, 10:39 p.m.,
in response to message #3 by Raymond Del Tondo

Had the same problem with my 30b. It is pretty much gone now.

                  
Re: hp 30b LCD Rainbow mark
Message #5 Posted by Raymond Del Tondo on 17 Sept 2010, 3:23 a.m.,
in response to message #4 by Giovanni Jimenez

Quote:
Had the same problem with my 30b. It is pretty much gone now.
Yes, since the 30b is gone the problems also vanished.

SCNR;-)

      
Re: hp 30b LCD Rainbow mark
Message #6 Posted by Dave Britten on 17 Sept 2010, 6:11 p.m.,
in response to message #1 by JoeGeller

Is it similar to this?

http://holyjoe.org/hp/rainbow.htm


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