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3 Posts

03-28-2017

CA

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ideapad k1 pcb la-7261p repair

2017-03-28, 17:52 PM

New here, HI,

 

I am trying to fix one of these ideapad k1 tablets. I could use schematics, but if they are unavailable, i just need the pinout for the dock connector, that would be great so I can hard solder a usb connection, a 12vdc charge line and reinstall the firmware. It is looping at the nvidia logo and I can't get into any recovery mode except the firmware update mode (both service lights on at home button). Recovery mode will not engage, if it even exists.

 

I checked the hdmi port for possible interfacing, that's a wash, just the hdmi data streams there.

 

I don't have a usb port cable or port extender so I have to do this manually. Any schematic or usb connector pinout help would be great ;-)

 

Cheers - Dave

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3 Posts

03-28-2017

CA

13 Signins

76 Page Views

  • Posts: 3
  • Registered: ‎03-28-2017
  • Location: CA
  • Views: 76
  • Message 2 of 2

Re: ideapad k1 pcb la-7261p repair

2017-03-28, 19:55 PM

HI,

 

Just some additional chicken-scratch info on resistances/voltages of the dock port pins. From checking USB standards and termination requirements, it appears that there should be a 15k pull down resistor on the USB lines, however, no port pins are 15k.

 

Still searching for the USB pins lol...

 

Cheers - Dave

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