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    faulty gigabyte keyboard

    I recently bought a second hand Gigabyte Stealth gaming keyboard, model number GK-FORCE K7 and from time to time some of the keys, like 't', 'backspace' and other keys do not work. The odd thing is when I plug in the keyboard the '4' key is stroking without me doing anything.
    I am using Windows 10 but tried the keyboard on different OS's with the same results. Opened the keyboard tested the control board for voltages, faulty parts, traces and connectors with no bad one's found. The main IC is HT82A525R and EEPROM chip is T24C02A.
    I am trying to reprogram the EEPROM as soon as I will get the code and see what will happen.
    Any suggestions will be much appreciated.Thanks in advance.

    •   Alt9th January 2017, 12:32

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    Re: faulty gigabyte keyboard

    Take it apart, clean all the contacts and around the IC pins.

    Let it dry, test it before re assembly.
    Before you ask - have you searched the forum? Have you searched Google? - Please do so.
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    •   Alt9th January 2017, 15:59

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  3. #3
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    Re: faulty gigabyte keyboard

    Is it a membrane keyboard? Remove enough screws, plastic, etc., so you can lift up the membrane. Clean all carbon buttons and contacts. Examine in/ around/ under the 4 key, to see whether it has loose carbon, etc., that makes unwanted contact.

    Alcohol is a good solvent to try. Do not use acetone, lacquer thinner, fingernail polish remover.

    •   Alt9th January 2017, 17:04

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  4. #4
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    Re: faulty gigabyte keyboard

    Don't bother with the EPROM, this is a classic 'stuck key' problem.

    To explain: the keys don't each have their own connection back to the controller, they are grouped together so that four or five of the keys share a common connection. The principle is called multiplexing or 'matrixing' and it makes the keyboard far easier and cheaper to manufacture. Your problem is the '4' key is stuck closed and that is preventing the signal from the other keys in the same group from being recognized.

    Almost certainly as this is a 'gaming' keyboard, the membrane under the '4' key has become permanently stretched so the switch stays closed. Open it up and carefully lift out the three plastic layers of the membrane assembly, there is a top layer, a bottom layer and spacer layer in the middle with holes in it under the key positions. Look carefully and you will see a connection between all the keys that are not working. Normally, when the key is pressed, the top layer (nearest the key cap) is pushed downward through the hole so it touches the bottom layer and makes electrical contact, in your case, the connection isn't breaking when the pressure on the key is released.

    Brian.
    PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
    It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.

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