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67 Posts

10-07-2013

United States of America

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Thinkpad T400 Wi-Fi activity Light wont light up

2015-06-07, 3:20 AM

Hi all,

 

I have a 2010 Lenovo Thinkpad T400 -- Recently , I have noticed that the wifi activity light (in the bottom bezel of the LCD screen) doesn't light up. I am still able to connect to wifi networks and all , but this still bugs me.

 

Does anyone know a solution??

 

Please let me know!:manvery-happy:

 

Matt

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3019 Posts

03-15-2014

Bangalore

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Re: Thinkpad T400 Wi-Fi activity Light wont light up

2015-06-09, 10:03 AM

Hi Matt,

 

Welcome to Lenovo Community!

 

Is only the Wifi LED indication is not showing or all the LED indication not showing?

 

Best regards,

Hemanth Kumar



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4479 Posts

07-24-2013

Switzerland

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Re: Thinkpad T400 Wi-Fi activity Light wont light up

2015-06-09, 12:58 PM

Most probably the wlan led is broken. You will need to replace either the inverter (if you have a CCFL panel) or the LED subcard (if you have a LED panel), luckily both components are very affordable and can be easily found in eBay and similar shops.

 

To found out which panel you have you can run any hardware analysis program. HWInfo for example. The MTM from your T400 may help too, it's a 7 digit code that can be found in a black and white sticker at the bottom of the laptop. Please post it here (do not post your S/N number!)

 

You will need to remove the bezel to change it, which you can do following these steps:

 

  • Download the HMM (hardware maintenance manual): click me!
  • Buy an inverter (FRU 41W1479) or a LED subcard (FRU 42W7968, 42W8017, 42W8231 or 42W8229)
  • Remove battery and AC adapter
  • Check chapter 2010 on how to remove the bezel (you need to remove 6 caps and 6 screws, be careful when detaching the bezel, there is some double sided tape sticking it to the LCD panel)
  • Swap the inverter/LED subcard
  • Put the bezel back

Hope this helps...


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67 Posts

10-07-2013

United States of America

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Re: Thinkpad T400 Wi-Fi activity Light wont light up

2015-06-24, 4:00 AM
Just the WIFI light isn't working

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