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Hello everyone, today we are going to learn about the keyboard of the laptop

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A keyboard, abbreviated as KB, is the input device of a computer

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It's made up of a key cap, a silicone bowl, and this plastic balancing stand

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Silicone bowls are elastic silicone buttons

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The keyboard is managed by the EC in the mainboard architecture

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The EC integrates a keyboard controller

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The keyboard communicates with the EC through the keyboard interface

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The inside of the keyboard consists of 3 films and a silicone bowl

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Circuits are printed on the upper and lower films

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Each dot on the top represents a button

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Where there are polka dots, there is a circular hole in the middle film

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There is no circuit in the middle film, it is the insulation layer

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When we press the button,

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the silicone bowl makes the upper and lower contact points come together to form a character

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These characters are transmitted to the EC through the keyboard's interface

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What are the common keyboard failures?

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The first type is key adhesion, what dose it mean?

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For example, I press the "L" button

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and the "P" character pops up

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There is also a fault is the character jump

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When I don't press any buttons at all, characters appear on the screen themselves

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This fault is usually caused by a short circuit of the keyboard itself,

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or a leakage of power to the keyboard interface, or the EC itself

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The second common fault: the key does not function

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This fault is usually caused by a disconnection keyboard,

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open interface line, or EC welding

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In general, the keyboard is the most likely to damage on a laptop that has water ingress

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Ok, this is an introduction of the laptop keyboard