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now many sellers on ebay have cheap motherboards for asus x551ca, it’s more expensive to fix a motherboard than to buy a replacement.
Dell Inspiron 15 Gaming 7567 uses a power connector port dc in cable, the power jack would be easy to loose after two or three years, now laptop companies more likely to use a cabled power jack, easy for users to fix the problem. Final users can find the dc jack from this page:
I would suggest customers not to buy a laptop which is charged by a type-c connector, now type-c power jack is hard to get and when the connector get problems, the only way to solve the problem is to buy a new motherboard, that would be very much expensive and very much complicated to process.
Dell Chromebook 11 3180 3189 uses a very special power jack connector, the power jack is soldering to a iron cover, people have to replace the whole part when the jack is broken/burnt, this is the correct part: https://www.dcincable.com/xnj46-0xnj46-c..., remember not to move the laptop while charging the battery, a good habit can make the laptop working longer.
And this is the cooling fan for Dell XPS 13 9343 9350 9360: https://www.dcincable.com/xht5v-0xht5v-d... it is exactly the same as the disassemble images show.
Dell XPS series are great laptops for work and study, most of Dell laptops are manufactured by Foxconn who is the same manufacturer for Apple MacBook and iPhone, the quality always the TOP. I am not advertising, but I LOVE Dell much more than any others.
Dell XPS 13 9343 9350 9360 use the same power adapter port dc in cable: https://www.dcincable.com/0p7g3-00p7g3-c...
But Dell XPS 9365 and 9370 use a USB Type C port, I think laptops are using more and more Type C USB ports which is good to consumers.
it is not easy to replace a power jack for Lenovo ThinkPad T420S because it requires soldering job and people might burn the board while doing the job, you are replacing a power jack board, just disassemble and assemble the laptop, here is a seller for Lenovo ThinkPad T420S power jack board: http://www.dcincable.com/04w1699-04w3997...
I got a power jack from seller dcincable.com, it's exactly the same as your images show, but I could not find a service manual, it's great to have your help, thank you so much.