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担当者：373
投稿日:
I have tried plugging it and booting without the battery and trying a different t420's keyboard to no avail. the light on the keyboard doesn't light up and the computer itself doesnt make any of the normal fan sounds when you try to power it.
any thing els i could try?
Thanks, Spoofo9t9
担当者：499.2千
投稿日:
Hi @msh1919 ,
No schematic but perhaps the service manual will be of some help or at least a start.
On p.106 it details the necessary pre-requisite steps and then the procedure to remove the DC-In jack.
You could start from this point. With the power and battery totally removed from the laptop, use an Ohmmeter to measure that the jack itself is OK
Here is the part number for the DC-In jack, in case it is faulty and you have to order a new one, 04W1635 (found on p.140)
Just search online using the number only to get results for suppliers of the part.
考えを変えさせてください。
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