From: Bruce Markowitz (scosgt_at_worldnet.att.net)
Date: Mon Jul 30 2001 - 13:50:18 EDT
It sounds like the inverter is shot
Just make sure you do have it set for the internal LCD (Fn+F7), this can
simulate this problem sometimes.
----- Original Message -----
From: "Greg Terrell" <gtrt_at_moab.demon.co.uk>
To: <thinkpad_at_cs.utk.edu>
Sent: Monday, July 30, 2001 4:58 AM
Subject: 770 - LCD illumination
> 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.
> Some 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
> --
> Greg Terrell
>
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