From: Greg Terrell (gtrt_at_moab.demon.co.uk)
Date: Tue Jul 31 2001 - 05:25:02 EDT
Bruce
Thanks for your reply.
I see I said I use Fn+F4 to blank the display - I should have said
Fn+F3!
I have it set for internal LCD. I have tried it on all 3 settings -
internal, external and both. Only the internal LCD shows this problem
and it happens when set to internal LCD only and both internal and
external. External monitor works fine.
How easy is it to change the inverter card?
I've got the hardware maintenance manual supplement and the LCD FRU
Parts List. Do I need anything else?
Thanks
Greg
In article <008201c11920$1a94ece0$4a2d8bac_at_IBMUSER>, Bruce Markowitz
<scosgt_at_worldnet.att.net> writes
>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
>>
>
-- Greg Terrell
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