Laptop LCD Panel Puzzler

Giganews Newsgroups
Subject: Laptop LCD Panel Puzzler
Posted by:  Grinder (
Date: Thu, 05 Sep 2013

I've been working to sort out a video issue on a Sony laptop.  On
startup, the screen presents vertical multi-colored lines on one half of
the screen briefly before going black.  Also there is a light halo
around the edge of the screen that sort of gives a tunnel vision effect.
  It fades to black after a few seconds.  Examination of the "lit"
screen with a flashlight rules out a simple backlight failure.  Hooking
up to an external monitor provides clean, stable video.

Replacing the screen has changed the scenario, but not really for the
better.  The screen lights up, but is very oversaturated.  Also, the
halo is still there, but it is now black a does fade a bit, although not
completely.  The video also has a sort of patchwork effect in places.
The refresh rate is *very* low--it just sort of shows a snapshot of the
desktop, with all of the aforementioned defects, but does not refresh
with mouse movement or selections.

Replacing the inverter has had no effect, on either of the panels'
behavior.  An inspection of the cabling does not reveal any obvious defects.

I'm sort of at a loss here.  The failure is unlike anything I've seen
before, and I don't really know what to try next.  Any ideas as to what
might be going on here?