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T23 screen is dark

T20-T23 Series and T30. NOT for T25-Retro.
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Dkw4195
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Joined: Mon Jun 04, 2012 8:46 pm
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T23 screen is dark

#1 Post by Dkw4195 » Mon Jun 04, 2012 8:56 pm

I am having problems with my thinkpad T23. The screen is very dark. When I hold a flashlight at it I can see the system boot up and work. I have replaced the screen with a new one, I have replaced the converter, and I see no visible signs of damage to the ribbon cable. Can someone please try and assist me. This is becoming very frustrating.

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Re: T23 screen is dark

#2 Post by Eric Giles » Thu Jun 07, 2012 10:12 am

If you haven't replaced the ribbon cable, then go ahead and replace it. Even though it looks fine, it probably isn't. I have dealt with this same issue with numerous T2x systems, and if all else fails replacing the ribbon cable fixed the issue.
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Dkw4195
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Location: China Grove, NC

Re: T23 screen is dark

#3 Post by Dkw4195 » Thu Jun 07, 2012 8:13 pm

Thank you I will give that a try. I have tried everything else.

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Re: T23 screen is dark

#4 Post by rkawakami » Fri Jun 08, 2012 10:29 pm

I'd say if you replaced the LCD with an known good panel and you are still having the problem, then besides the LCD cable, your system may have blown a fuse. Check fuses F4 and F5 located below (i.e. towards the front edge) the LCD connector on the top side of the motherboard. What can also cause the lack of a backlight is that the lid switch is stuck in the down position. Make sure that the plunger that's on the keyboard bezel is not pushing down on the microswitch that's mounted on the thin I/O board.
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