Many now touch keys are digital devices and appliances use . Such appliances can be made thin , and easy to clean . But everything has two sides, that is, the touch keys easily broken. Touch keys mentioned here does not mean there is a kind of inner steel buttons, just use that have the effect of pressing lightly . This button can easily be broken if the quality is not good . If a button is broken it also does not matter, the possible loss of function . But if you touch the keys broken , then the other would not use the buttons . Because the touch buttons are generally short-circuit fault , a key short-circuit control chip would think it does not bounce .Qtmservice manual download site

Other buttons will not even bother pressing the control chip , thus resulting in a failure of the entire function . There is a fatal flaw : This key can not be replaced individually , if you want to replace , then to replace the whole together .Qtmservice manual download site

 I have such a digital device this is the key to use. One of the function keys is broken . I have learned through this key replacement price and buy a new one almost. Too uneconomical , I "dead horse a living horse medicine ." First observation of the wiring and the keyboard keys inverted mode circuit the same. I analyzed its principle possible and keyboard circuit almost as well as upper and lower circuit contacts in key areas. Due to the long pressed film deformation caused by a short circuit or circuits off . So long as the two films separately can solve this problem.Qtmservice manual download site

 Went ahead . First, most got a fine needle in the middle of the keys accidentally stab a hole , just the first layer circuit pierced. The needle is then inserted into the first -layer circuit helical tip is slightly smaller than the radius length of the inserted key . The needle is then pressed and key board paste , then rotate the needle . Let the needle to draw a separate two keys in two keys . After needling a first layer portion where there is deformation of a plastic piercing sandwiched between two layers to avoid a short circuit again. Such keys can be used normally . If still not working, it can only take a last resort .

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