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[SOLVED]820-3536 no trackpad or mouse

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andrew boren

Member
computer came in claiming waterdamage and wont turn on. i unpluged the keyboard and it powered, but no trackpad in windows and was not able to use usb mouse. unpluged trackpad, usb mouse worked. pluged back in keyboard, only power button, no keys, still usb mouse. pluged back in trackpad and it still turns on, but no usb mouse no trackpad and no keys except power button. tested for keyboard power on pin 30 got 3.33 and pin 4 3.43. i see no signs of water damage anywhere. where should i look. usb ports are all working fine when trackpad is unpluged
 
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dukefawks

Administrator
First try a known good trackpad and cable. It should work without D4611. Check Both those USB lines at the connector on diode mode too, could still be bad trace.
 
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andrew boren

Member
sorry its taken a few days to reply. got the new keyboard in to test. still no keys. left track pad unplugged. what do you mean by both USB lines?
 
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andrew boren

Member
oh, sorry i will order a new trackpad and cable. i thought the keyboard would work without a trackpad installed like it does on all the other macs i have worked on. i have it on its way and will get back with you when it arrives.
 
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andrew boren

Member
wow, that fixed it, can someone explain how a non working or not attached trackpad can kill the keyboard? and what all models this is a problem on.
 
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dukefawks

Administrator
The keyboard controller freaks out when there is no trackpad connected. Sometimes there is no KBD at all, sometimes if gets intermittent, sometimes it just works. This goes for any machine 2010 and up really.
 
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andrew boren

Member
well thank you for that explanation, i will have to keep that in mind. i guess ive just been lucky so far having them work.
 
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