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PostPosted: Thu May 21, 2009 6:20 am 
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Joined: Thu Aug 04, 2005 3:31 am
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Location: UK
Yesterday suddenly my screen went very dark :eek:
If I look carefully I can see my desktop but the brightness have gone down the hill. Also nothing happens what i try to reduce or increase the brightness with the Fn key. It's plugged on my docking station and I have an external monitor which works fine via VGA. I replaced the screen 3.5 years ago after I accidentally cracked it.

Now the question is, does it have to do with the screen or the inverter? Or something else? It happens as soon as I switch on the laptop so the Operating system is out of the question.

Any opinions will be highly appreciated as I need to sort that out as soon as possible :!:

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Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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PostPosted: Thu May 21, 2009 12:40 pm 
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Was this the first time that you lost the backlighting? Does the backlighting come back on if you power the T43 off for a while first?

Have you previously had a reddish tinge to the display at all?

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PostPosted: Thu May 21, 2009 1:34 pm 
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tomh009 wrote:
Was this the first time that you lost the backlighting?

Yes that was the first time.

tomh009 wrote:
Does the backlighting come back on if you power the T43 off for a while first?

Last night it did come back for a few minutes but it was very dimmed. Now its always same, just very dark, can barely see the desktop. It's always the same from the time I switch it on.

tomh009 wrote:
Have you previously had a reddish tinge to the display at all?

No, never had anything like that.

Isn't the inverter that adjusts the brighteness on the screen? I am thinking that it might be that rather than LCD since the LCD still works. Or maybe I want it to be that cause it's much cheaper than buying the LCD!

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Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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PostPosted: Sat May 23, 2009 10:58 pm 
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Joined: Sun Feb 25, 2007 11:28 am
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Inverter is the cheapest possible fix, so try replacing it.

If that doesn't fix the issue, your LCD has a bad backlight or there's a motherboard problem.

Let's hope it's option # 1...and that all will be well with a new inverter...

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Cheers,

George (your friendly retired FlexView farmer)

Collecting SSDI: A31p, T42p, T43p

Abused daily: T43pSF, T60, R60F, R500F

For sale: T61, T61p


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PostPosted: Sun May 24, 2009 2:28 am 
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ajkula66 wrote:
Inverter is the cheapest possible fix, so try replacing it.

If that doesn't fix the issue, your LCD has a bad backlight or there's a motherboard problem.

Let's hope it's option # 1...and that all will be well with a new inverter...


I've managed to find the cracked LCD. I was planning on replacing the backlight from the cracked screen to the broken one.

But guess what? The cracked doesn't work either.

So it's got to be the inverter! I bought one on eBay for $10 and can't wait to try it! It's P/N is 26P8464.

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Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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PostPosted: Sun May 24, 2009 1:28 pm 
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Joined: Sat Aug 04, 2007 9:06 am
Posts: 9
Location: Chicago, IL
Please let us know if this works! I have the same problem...


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PostPosted: Sun May 24, 2009 1:43 pm 
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Is this hard to replace?


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PostPosted: Sun May 24, 2009 2:35 pm 
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fozzy40 wrote:
Is this hard to replace?

The inverter? If so, then it's pretty easy to do. Grab a copy of the Hardware Maintenance Manual:

http://www-307.ibm.com/pc/support/site. ... MIGR-58837 (TYPE 187x)
http://www-307.ibm.com/pc/support/site. ... MIGR-58791 (TYPE 26xx)

and find the section about removing the LCD front bezel. Typically, that's a couple of screws underneath plastic covers on the face of the bezel (some may be along the sides as well). Unclip the bezel, being careful not to break the thinner parts and the inverter is the thin, long board near the bottom of the screen. Unplug the connector going to the LCD panel and disconnect the inverter from the ribbon cable (a screw may be holding the inverter in place). Re-assemble in reverse order.

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PostPosted: Thu May 28, 2009 3:38 am 
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Location: UK
fozzy40 wrote:
Please let us know if this works! I have the same problem...


I received my replacement inverter yesterday, tried it on but it's still the same. Then I tried it with the cracked LCD and guess what, the cracked LCD worked fine.

Basically there was nothing wrong with the inverter, the problem was that when I first tried the cracked LCD with the original inverter I FORGOT to connect its power to the inverter!

At least the inverter was only about $10 and I know that it's definitely the LCD. I guess I can't really blame it for being faulty since I've being using the laptop continiously for the last 4 years. Hopefully I'll get a nice deal off eBay now!

_________________
Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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PostPosted: Thu May 28, 2009 8:59 am 
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You cud take the backlight from the cracked lcd and put in the other lcd, abit of a tedious job but doable.


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PostPosted: Thu May 28, 2009 9:20 am 
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xyz wrote:
You cud take the backlight from the cracked lcd and put in the other lcd, abit of a tedious job but doable.


Oh yes, thank you! I completely forgot about that! Thank god I didn't order the screen...will attempt to replace the backlight tonight.

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Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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PostPosted: Thu May 28, 2009 10:16 am 
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I find the idea of replacing a backlight with a used one not the best one around...

Backlights are less than $20 shipped...and that gets you an almost new LCD altogether...full brightness and everything...

My $0.02 only...

_________________
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)

Cheers,

George (your friendly retired FlexView farmer)

Collecting SSDI: A31p, T42p, T43p

Abused daily: T43pSF, T60, R60F, R500F

For sale: T61, T61p


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PostPosted: Thu May 28, 2009 10:39 am 
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Location: UK
ajkula66 wrote:
I find the idea of replacing a backlight with a used one not the best one around...

Backlights are less than $20 shipped...and that gets you an almost new LCD altogether...full brightness and everything...

My $0.02 only...


Well yeah, fair point. I guess I'll try the old one now, as it's already Thursday and If I order another one, probably won't have it till next week...

The other shouldn't be very bad, as I bought the t43 brand new and screen was only used for 5months before I cracked it with a piece of glass :roll:

_________________
Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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PostPosted: Thu May 28, 2009 1:50 pm 
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Posts: 9
Location: Chicago, IL
So it sounds like there isn't a definitive way to differentiate if it's a backlight vs. inverter problem. Does either typically go out first?


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PostPosted: Sun Jun 07, 2009 6:02 pm 
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Joined: Thu Aug 04, 2005 3:31 am
Posts: 62
Location: UK
hi everyone

Sorry I havent updated everyone with the problem, today finally decided to swap the backlight with the one from the cracked screen.

It is indeed a very tricky job as it involves opening the screen and messing with the insides of it! Was really impressed with the numbers of layers needed for a LCD. After about 1 hour I was finished and the result was very positive. Screen is working properly, there is a small shadow on left corner but cant really complain as I saved quite a lot of money. In the meantime I will be searching eBay to see if I can get a spare one to have around in case i need it for the future...

So if you ever crack your screen do not throw it away as it may be usefull in the future 8)

_________________
Lenovo Thinkpad x301 2776 upgraded to 4GB PC3-8500S
IBM Thinkpad T43 2668 moded: Intel 780, 2GB PC2-4200S,100GB 7k100,IBM II a/b/g,BT,DL DVD Burner,9cell,Advanced Dock II
Toshiba Satellite Pro U200 (T7200, 2GB, 3945a/b/g, DL DVD Burner)


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