[ltp] Re: Thinkpad T20 lcd dim

Wed, 12 Oct 2005 10:39:04 -0400

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Wookey wrote:

>+++ Bert Haskins [05-10-12 09:21 -0400]:
>  
>
>>>>I've got a T20 that the display has gone out on... it is always dim, you
>>>>can see the display under bright light or with a flashlight, but is
>>>>otherwise dark. 
>>>>
>>>>Anyone have any suggestions about whether the problem is in the lcd
>>>>
>>>>        
>>>>
>>It could be the CCFL tube, the DC/DC converter, the inverter, the 
>>cable(s) and probably  even
>>something else that I haven't run into yet.
>>At one time or another I have seen each one of these cause the "dim/no 
>>backlight" condition.
>>    
>>
>
>Yep - that's a about right. I have the same problem on my T22. I bought a
>new inverter and it fixed the problem perfectly for 2 days, then it went
>dark again :-(  Does that mean there are two problems? A new inverter drove
>a borderline part for a short while? 
>
You may have a poor ( dirty/corroded ) connection somewhere between the 
mboard and the inverter.
The other answer may be arc over at the terminals on the CCFL.

>
>Rather than continue to randomly buy bits to work out the problem, I'm going
>to send it to a laptop repair place where they have a good stock of bits to
>swap in an out so they can get to the bottom of it.
>
I hope you don't have to go to a parts swapper.
The way to repair something is to find out WHAT the problem is and FIX it.
Yep, I'm shouting

> More expensive but
>hopefully more effective.
>
>Wookey
>  
>

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Wookey wrote:<br>
<blockquote type="cite" cite="mid20051012135030.GS29408@xios">
  <pre wrap="">+++ Bert Haskins [05-10-12 09:21 -0400]:
  </pre>
  <blockquote type="cite">
    <blockquote type="cite">
      <blockquote type="cite">
        <pre wrap="">I've got a T20 that the display has gone out on... it is always dim, you
can see the display under bright light or with a flashlight, but is
otherwise dark. 

Anyone have any suggestions about whether the problem is in the lcd

        </pre>
      </blockquote>
    </blockquote>
    <pre wrap="">It could be the CCFL tube, the DC/DC converter, the inverter, the 
cable(s) and probably  even
something else that I haven't run into yet.
At one time or another I have seen each one of these cause the "dim/no 
backlight" condition.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
Yep - that's a about right. I have the same problem on my T22. I bought a
new inverter and it fixed the problem perfectly for 2 days, then it went
dark again :-(  Does that mean there are two problems? A new inverter drove
a borderline part for a short while? </pre>
</blockquote>
You may have a poor ( dirty/corroded ) connection somewhere between the
mboard and the inverter.<br>
The other answer may be arc over at the terminals on the CCFL.<br>
<blockquote type="cite" cite="mid20051012135030.GS29408@xios">
  <pre wrap="">

Rather than continue to randomly buy bits to work out the problem, I'm going
to send it to a laptop repair place where they have a good stock of bits to
swap in an out so they can get to the bottom of it.</pre>
</blockquote>
I hope you don't have to go to a parts swapper.<br>
The way to repair something is to find out WHAT the problem is and FIX
it.<br>
Yep, I'm shouting<br>
<blockquote type="cite" cite="mid20051012135030.GS29408@xios">
  <pre wrap=""> More expensive but
hopefully more effective.

Wookey
  </pre>
</blockquote>
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