Try to rely on this phrase:
Diagnosis: damaged, not the button itself, and a conductor between the button and the corresponding leg of the chip.
It is known for sure, 100%? If the reason you believe this, then you first need to obtain confirmation - take, for example, probes from a multimeter with sharp tips and jumper them the most ragged conductor. Without disconnecting this jumper, press the power button. If the reason was really obrandom Explorer, the tablet turns on from the button, i.e., your diagnosis is confirmed.
Well and further all is simple - very carefully, sharpened soldering iron to solder between the leg of the chip and push-button permanent jumper of thin wire, and then use as usual. For such a case is well suited wire MGTF-0,03, he's no thicker than a sewing thread. If its nowhere to get, you can take the wrapping of PALSO and 0.12, tinned with stinging but it ends on a length no greater than 1 mm is quite difficult.UPD
: if the track is a ragged conductor is not visible (on multilayer boards is almost always) have to look for the scheme - at least of the same apparatus with the same percent and chipset.UPD2
: As it turned out, the processor of the device (SC7731G - SoC is responsible for all, including for food) is a BGA, which has insights not available and that I was going to suggest (to iterate over all pins) - will not work. Last chance - take advantage of the pull-up resistor on the line. power, if any
. The voltage of this procedure was approximately 1.8 volts, the lift must go to him. First, we need to make sure the on button. supply voltage no (this will confirm the presence of a cliff). Then look on the Board all SMD-resistors with resistance of several tens/hundreds of kilo Ohm, but the ends of which there is voltage in the off state
, and short-circuiting both ends of each resistor to the negative supply through a resistor of several hundred ohms
(not to be a Shorty by accident). If the next shorting the tablet will be all the problem is solved, the line is found.
But there is a possibility that the lift signal lines to positive is done by the resistors built into the BGA. Well, then finish the race with a feeling that made everything possible, and put the tablet in the trash.