Most probably one of these two wires has become disconnected, either directly behind the USB port or in the two connectors CN72 and CN8 These two wires are used to do the signalling between to USB devices. If it still says 'not responding' then with the power removed from the keyboard, use an Ohmmeter to prove continuity of the data +ve and data -ve wires from the USB Device port to the CPU. Has the USB function worked before on this keyboard or is it new to you and you do not know if it did? If it is new to you here is a link to the User Guide which is available in several languages. When you connect the phone to the USB can you change the phone to go from USB connect as 'Charge only' to connect as Media device (MTP) or USB storage and see if you get connected? Be aware that your keyboard does not recognize. That shows that there is power coming from the USB port. It is good that it shows that your mobile is charging.
If there is an indication that the USB device is being powered by the keyboard, get back to us here and we'll go on from there about checking out the problem further into the keyboard. Also check that there is no build up of lint and dust in the port. If there is no indication of power being supplied to the device it indicates that either the +5V DC USB Vcc power or the USB Ground is missing.įirst with a magnifying glass and a strong light check your USB Device port on the keyboard to make sure that the 4 pins are all still there and that they are straight and parallel with each other. All you know is that they do not work, not why they don't.
as these give no indication that the power missing might be the problem. a mobile phone in charge mode only, a USB powered speaker, a USB HDD with a power light etc. Does the USB to Host function work OK? If it does this proves that the USB controller in the keyboard is functioning OKĭoes pressing the USB key bring up the Audio Player display in the Playback display window?Ĭan you connect any USB device to see if it gives an indication that it is being powered e.g.
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