Where can I find keyboard layouts, on simple controllers like a black blot?

Question

Do it yourself

Where can I find keyboard layouts? On simple controllers such as a black blot.
I have not made any requests, only solid garbage in the issue. Searched on youtube. True, I didn’t write to the monitor.
On three different keyboards flooded with clean water (laptop HP 2008, wireless A4, USB Genius Genius LuxeMate i200 GK-090017), after drying with disassembly, an almost identical malfunction appeared, a number of keys do not work - "down arrow", "Esc", "F3," F4 ", "F5". Otherwise, all keyboard functions work. What could be the malfunction? Patients died from autopsy? :))

Answer 1

In Klavakh, they didn’t come up with anything new - a matrix of columns and rulers.
In the case of 108 claves, this is a 10x11 minimum 32 pin chip.
21 2 2 3 2?

Answer 2

On simple controllers such as a black blot.

These are not always simple controllers - a blot is a type of housing for a microcircuit.
If only some keys do not work, then the problem is in the contacts of the keys, and not in the controller.
Since the keyboards are membrane - look into the space between the two membranes, it should be carefully wiped with some non-aggressive degreaser.

Patients died from autopsy? :))

This is also possible :)
Look carefully so that there is no dirt in all connectors and all tracks with contacts are in order.

Answer 3

"If only some keys do not work, then the problem is in the contacts of the keys, and not in the controller."

It is clear that the similarity (identity) of faults is surprising. I want to unearth the reason. Repairmen categorically do not want to be engaged in such repair for a long time. And it is correct. but I WANT A SCHEME! Really in pentabytes of the Internet is not present???

"These are not always simple controllers - a blob is a kind of housing for a microcircuit."

Even branded manufacturers such as Logitech, A4, cheap keyboards are driven on the same chips, which are produced in tens to hundreds of millions of copies, only the design of the case, the layout of the membranes, their own piping. So I think the switching scheme of "keys" (contacts) for keyboards of this class is the same.
One line on which idle keys sit is definitely alive. Other keys work on it. And I can’t trace the second line, it’s very long and intricately goes with a large train - 5-6 parallel tracks.

Answer 4

You will not find the layout of the keys in the matrix anywhere, at least under most keyboards. Draw. Multimeter in dial mode to help.
And membrane keyboards die well and confidently from water, since the matrix tracks are not protected by anything, they are easily corroded by electrolysis, and crumble well when the base is broken or bent.

Answer 5

The button does not work - it means that only 2 malfunctions are possible.
1. when pressed, two layers of the film do not contact each other, the contact pads under the button are oxidized from moisture
2. the track on the film is broken / cracked. They are essentially disposable and it is not expected that someone will disassemble them, let alone bend / unbend the films in an attempt to wash them ..
In any case, you take a multimeter and call.
First you check the integrity of the track, you ring one and the second track from the contact pads to the blot. Then you check the closure, poke a multimeter into the contacts next to the blot and press the button, when you press it, it should also ring.