T60p IPS backlight problem?

T60/T61 series specific matters only
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Joseph-N
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T60p IPS backlight problem?

#1 Post by Joseph-N » Thu Apr 21, 2011 9:18 pm

Hopefully, someone will read this and say "oh, I know that problem." ;)

Last week, my T60p (2623DDU with UXGA and WinXP) froze, or so I thought. I restarted and kept using it. Well, it's kept freezing intermittently, always while under heavy load (hot), and always worked after restart. Now it froze while I was playing a game, and I could hear the game still running, so I looked in bright light, and could make out a faint screen image: the Thinkpad wasn't freezing, the backlight was turning off.

I was hoping I could plug in an external screen, and see for sure whether it is the backlight or the computer itself. Unfortunately, it seems I cannot plug in an external screen on the fly, but have to restart, at which time it works again anyway.

I searched the forum, and didn't see my exact problem, but saw t60p problems were regularly getting the response that t60ps need regular cleaning or they overheat. So, I carefully cleaned it, I thought. I didn't blow compressed air, contrary to some suggestions, because I was afraid of blowing something somewhere and making things worse.

Since cleaning it, the fan is now much louder. I don't know if that is good (blowing more air) or bad (dying). The screen blacking out appears to be better, but it's hard to tell, because it is so intermittent. (It's happened only once since cleaning.)

So, it appears to me that the problem is either heat, and my cleaning didn't totally fix it, or it isn't heat at all.

The problem is I'm a road warrior, I'm usually away from home, and w/o another computer to read instructions from while I perform anything too intensive.

Apologies if I've been wordy. Any suggestions would be appreciated. I bought a t60p to have a bullet proof laptop on the road. Is it time that I retire this one and move on?

Harryc
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Re: T60p IPS backlight problem?

#2 Post by Harryc » Thu Apr 21, 2011 9:24 pm

Run tpfancontrol (in BIOS mode) at all times and record the CPU and GPU temps before it blacks out next time, although from your description this sounds like a bad inverter or CCFL (backlight) issue.
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Joseph-N
Posts: 9
Joined: Fri Aug 08, 2008 10:46 am
Location: Los Angeles, Calif.

Re: T60p IPS backlight problem?

#3 Post by Joseph-N » Tue Apr 26, 2011 7:21 pm

Thanks. O.k., you got me: what is a bad inverter?

It is NOT a temperature problem. I went into CCC and set the GPU specs lower, 800x600, lowered to 16 bit, lowered the performance slider to "balanced" to slow down the Mhz. Even after all that, after about a day, it blacked out on me again. At the time, TPfancontrol had my GPU at 70°C or lower the whole time.

Besides, T60 overheating complaints usually say that the machine will not work until it gets a few minutes to cool down. With mine, I can always restart it immediately.

On the long shot chance it's a software issue, I guess my next step is to do a Windows System Restore, and hopefully turn back to a configuration that doesn't have this glitch.

Since System Restore probably will not make any difference, my question becomes: guys, is it worth having it fixed? Prices I get in my mailbox for refurbished Thinkpads seem pretty dirt cheap these days.

BTW, I am hardly the only T60p UXGA owner with the problem: http://forum.notebookreview.com/lenovo- ... light.html

Harryc
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Re: T60p IPS backlight problem?

#4 Post by Harryc » Tue Apr 26, 2011 7:28 pm

The inverter is a circuit board inside the lower LCD bezel that provides (AC) power to light the backlight. For a UXGA T60P the FRU# is 42T0079.
http://cgi.ebay.com/IBM-ThinkPad-T60-In ... 4aa64117ad
You might be able to do better on the price by placing a WTB AD in our own Marketplace forum.
Instead of rebuilding the OS, consider running a live Linux CD for a day ....
http://www.linuxmint.com/download.php

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