Eliminate touch switch

[mfrsh]

Does anyone know of how to eliminate the touch switch so the unit powers on when plugged in. I want to be able to run this humidifier from an environmental controller. The coil for the touch switch goes to pin 12 on the ic. Thanks.

 

[Solaris17]

Probably easier to jump it on the switch side first. See if you can just close the wires. Otherwise you can try jumping pin 12 to ground or lifting it up if you measure a high side. What does pin 12 read while it’s “running”? That might give you a clue.

 

[mfrsh]

Probably easier to jump it on the switch side first. See if you can just close the wires. Otherwise you can try jumping pin 12 to ground or lifting it up if you measure a high side. What does pin 12 read while it’s “running”? That might give you a clue.

I've tried to jump the switch by soldering the leads but it still only powers up when you touch the jump wire or the coil and soldering to a ground does the same thing. I'm guessing the actual "switch" is in the ic because there isn't a transistor that I could find. All pin 12 does is act like the touch coil itself, when you touch it the unit powers on and off. I don't have the equipment to test so I am relying on your expertise. I have alot of experience with the assembly of boards but I am far from an engineer or technician.

Probably easier to jump it on the switch side first. See if you can just close the wires. Otherwise you can try jumping pin 12 to ground or lifting it up if you measure a high side. What does pin 12 read while it’s “running”? That might give you a clue.

The 3 leads going into r23 which go to pin 12 is the actual coil for the touch sensitive switch. There are 6 of them on the board for different functions like power, humidity, uv light, sleep timer, humidity level, and timer.