(Feedbackto.hp)
  Item: 248
  Resp: 3 of 3 by sanker@hpcvbbs.cv.hp.com
Author: [Greg Sanker]
  Date: Tue Apr 07 1992 14:35 

[Note: If your HP 48 display is dying, this may apply to you.  -jkh-]

I checked with the Hardware folks, and here is the scoop:

There was a specific problem that may or may not occur in a limited
production of units. The problem has been isolated to the LCD and
has been resolved with the vendor. The potentially defective LCD's
were installed in HP 48's with serial numbers ranging 3013AXXXXX thru
3044AXXXXX. Symptoms of the problem are a pronounced black spot in the
upper left hand corner of the display and/or dark/missing columns
3,5,7 and/or 9.

If a unit is failing for the above reasons, subject to
verification by the Corvallis Service Center, it will be covered as
part of the standard warranty, even if the standard warranty period
has expired.

Greg (SYSOP)