Sub Nano Kbox no display no firing no reason

[wickedwes]

Good morning all,

First time posting and just joined the community. My girlfriend was using her subnano last night before going to sleep, and it was working fine. She woke up this morning to find it not turning on(display) and not firing when holding the button. It did not fall, and was not plugged in to cause any sort of electrical surge. She was sleeping with it so the worst I believe that could happen was the button was possibly pressed/held while sleeping. I switched batteries to test, as well as plugging it in the mini-usb port, but it never displays anything.

After watching videos, I learned how to take it apart and expected to see some kind of connection problem, but everything looks good regarding wiring. I've taken pictures that I'm hoping will show you an issue that I'm not seeing. I apologize for so many, as I wanted to make sure to get all angles. If other pictures need to be taken with the circuit board unscrewed, I can do that.

One thing that I'd like to add is that this device has taken many falls. From being in her lap and standing up to hit the carpet, to getting out of the car and it hitting pavement. It has always continued to work, but honestly I'm surprised the tank hasn't cracked. So even though nothing happened last night, there could easily have been a problem just waiting to occur internally from the previous falls.

 

[TheRealSean]

Dont know if you still have your problem hope problem is solved. If not check your battery or find another see if its good. (has a good change on it) I see its apart so I assume you checked wires making sure no loose connections or breaks in wire insulation. Sounds stupid but smell the board. Burnt components can give off a smell. It would be faint because of small components but its worth a shot. Inspect board for any burnt or black spots front to back and again smaller components harder to see. If you display screen is held in place with two sided tape carefully lift it off making sure you dont unplug from the ribbon cable or tear it. Your ic chip should be under it check it out. I dont know of any button tricks if there are any. But you can try plugging usb cable to a 5v - 1amp power sourse make sure its not over 5volts. Sometimes that can kick start the board plug it in and unplug couple of times. I personally dont know of any repair shops that do component level repair on that small of circuit boards.