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Date: Sun, 21 Oct 2007 15:27:14 -0400
From: "Lewis G Rosenthal" <os2-wireless_users@2rosenthals.com>
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Subject: Re: [OS2Wireless] OT: T23 fading screen

On 10/21/07 11:11 am, Stanley Sidlov thus wrote :
> well, since this is such a good thinkpad forum....<cough cough> 
>
> My T23 screen started to fade, that is, it would be bright at bootup and then dim. The 
> video out works. 
>
> I bought a used inverter on ebay but it's possible that it wasn't compatible in reality 
> isn't it since it was a different brand and the unit was marked T21.. that doesn't seem to 
> be it (or the inverter sucked). Should I Try another inverter (new) or go for the entire 
> LCD assembly?
>
>   
It has been my experience that the backlight is a persistent issue 
(screen never brightens). In your case, the screen is bright at boot, 
and then fades, pointing me to the inverter. I doubt it's the LCD itself 
(I would expect the backlight to go before the LCD assembly). You need 
to be careful to get the right inverter for the display you have, or it 
may not supply the correct voltage to power the panel. The T2x models 
take similar inverters, and the LCDs all take the same inverter part 
number (10L1402). Perhaps you got a bad inverter, or perhaps the LCD 
switch (which turns off the display when closing the lid) is flaky 
(common problem on the T23).

I sent Stu Updike an inverter I had on hand for his ThinkPad last year. 
If you do a search on eCS-Technical, you may read about his journey 
through troubleshooting his display problems. We may also have discussed 
it on the wireless list; I don't recall specifically.

-- 
Lewis
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Lewis G Rosenthal, CNA, CLP, CLE
Rosenthal & Rosenthal, LLC
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