From: letoured_at_together.net
Date: Mon Jul 30 2001 - 16:26:30 EDT
Greg Terrell <gtrt_at_moab.demon.co.uk> said:
>Hi
>Can anyone help identify this problem with my 770 and, hopefully,
>suggest a fix.
>Model is 9549-1AO (the original 770 - P233MMX), 3 and a half years
>old so out of warranty. I've had it from new. (It's my 2nd
>ThinkPad, I had a 760CD before that which, so far as I know is still
>going strong!)
>The LCD illumination switches off without warning. So far as I can
>ascertain it is totally random - ie I can't find anything to cause
>it.
I have the same thing happen (the backlight switches off) every once
in awhile on a TP600e, and I run OS2 -- So after seeing your report, I
think its a harware problem. It never happens on AC power so I also
think its somehow connected to running on the battery.
days it happens frequently, other days it hardly happens at >all,
sometimes it will work OK for several days. I say it's >illumination
because you can just see the image on the screen. The >best way to
bring the illumination back appears to be Fn+F4 to blank >the display
and then use any key to switch it back on. Sometimes >this works,
sometimes it does not work and frequently the >illumination just
flashes. I've also tried rebooting, using the >reset button and
initializing the BIOS but none help.
>At first I thought it was a software problem because it started
>shortly after I upgraded from Win95 OSR2 to 98SE, possibly connected
>with power management as use of Fn+F4 sometimes results in the hard
>drive powering down but without any delay. Switching off as many of
>the power management features as I can makes no difference.
>Driver updates make no difference. I've installed the latest BIOS
>update and most of the latest drivers [1].
>I have searched the IBM web site for any reference to this problem
>but without success. There are references to screen blanking in the
>BIOS fix lists but I don't think this is a blanking problem. The
>document "TP General - Considerations for Windows 98 across ThinkPad
>systems" also refers to a number of display problems but none seem
>quite the same as my problem and none of the suggested fixes help.
>[1] I use modem drivers v2.36 (V.90 v2.516) as I found I get a faster
>connection than with v2.60. I also found video features v6.45.45
>gave me problems so have one back to an earlier version.
>I will very much appreciate any help.
>TIA
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