How do change connectors on a Thinkpad T61 LCD Backlight?

Posted on 2009-12-19
Medium Priority
Last Modified: 2013-11-17
I just bought a new LCD screen the replace the cracked one on my Lenovo T61.  When I went to plug the new screen into the backlight plug on the laptop, I realized that it had a different connector.  The original OEM connector is a 2-pin connector about 7mm wide. the two pins are the same size.
The connector on the new screen also appears to be two pin, but one of the pins is about 2x the width of the other. This connector is about 10mm wide and has "FWF1" printed on it.

The really odd thing is that the new LCD screen came with what appears to be an extension for the connector. It has a matching male-female ends that match the ORIGINAL small connector.  Of course, the LCD screen did not come with instructions.  And I couldn't find anything on the web.  

I am wondering if:
a) There is a way to switch connectors
b) I could use some type of adapter to connect the dissimilar plugs
c) I can cut the wires and splice the correct connector
d) I am losing my mind and there is an obviously step I am missing

Thanks, in advance.
Question by:hgoddard66
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LVL 43

Expert Comment

ID: 26087893
Great Database task!

Solution No 1:
Call IBM service and ask the technitian about the solution (they have to know it).

Solution No 2:
Visit special shop, show them both ends and your extension and ask for reduction adapter etc.

Solution No 3:
Cut the wires and splice the correct connector (you have to just make sure the voltage and polarity is correct)

Author Comment

ID: 26090798
The point you make in Solution No. 3 is the real crux of the question.  How would someone go about finding out if the voltage and polarity are correct?  I am very comfortable splicing the correct connector, but want to make sure that it isn't going to mess up the backlight or adapter.
LVL 43

Expert Comment

ID: 26090978
What is the exact part number of the LCD?

Two of them are here:

LTN141W1-L04 00A
and LTN141W1-L04 40A
they differ just in power connector probably.

Even more panels exist: http://www.pchub.com/uph/model/0--6913-1/Thinkpad-T61-Series-parts.html

Power connector should be removable with patiency. You just have to investigate how it is fixed. Some needle could help to release the metal part from plastic. I know, it is just one way connection sometimes.

The power voltage polarity is also important. It could be visible when you disassemble the panel. Other option is to measure which power cord is connected to the panel ground. You will need some multimeter etc. Manufacturer's web page should also help but asking some service people is better option.

Warranty will probably be void when you disassemble the panel or strip he cords, so it should be the last option.
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LVL 43

Expert Comment

ID: 26091009
Similar panel specification containing voltage polarity is e.g. here: http://www.volvo-lcd.com/images/down/2009923202158412.pdf

The part number is a key...
LVL 43

Accepted Solution

pcelba earned 1000 total points
ID: 26091302
One more important thing - different connector could mean different voltage. You have to make sure from panel data sheet.

Author Comment

ID: 26120905
I spoke with the company that I purchased the screen from and they are replacing it with the correct model.  I figured the delay in getting it fixed was worth it considering the risk of trying to switch the connector (wasnt sure about the connectivity and voltage).  Thanks for all the advice and suggestions.

Author Closing Comment

ID: 31668084
thanks for help.
LVL 43

Expert Comment

ID: 26121904
Yes, it was the best solution.

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