iStick 30w Autofire

[BumbleBee]

Howzit all you vape fundis

I have an interesting problem. A buddy has brought his iStick 30w to me with an autofiring issue. The device will fire an atty as soon as it's screwed on. The buttons all work fine for adjustments, switching from V to W mode and for powering the device on and off. Now for the interesting part, it fires all the time regardless if the device is locked or not, if the screen is on when the atty is attached it just displays the same screen as if there was no atty attached and displays 0.0 ohms. If the screen is off when the atty is attached then it stays off. I've adjusted the voltage all the way down to 2V but it seems to fire at whatever the power the battery is willing to give. I don't have a working meter so can't check the output.

I've opened it up but found no sign of damage, no loose wires and no evidence of moisture. Fiddling with the 510 positive pin with the mod in it's current condition is a no-no, it make sparky sparky.

Any ideas?

 

[Rowan Francis]

there must be a short somewhere . normally from a drop of joose on the board , but if you say there is none then you might find a crossed wire or twisted wire in there ..

 

[Lushen]

Just a thought, check if there is juice or residue of it on the button. it may have dried out and is causing the button to short

 

[BumbleBee]

I don't think it has anything to do with the button. If it were shouldn't the display react as if the button was being pressed? ie. puff duration counting and displaying coil resistance

It's almost like the whole chipset is being bypassed

 

[Lushen]

Actually, you are right.
If the button was being pushed, the display will change.

I did see a few videos on YouTube were the mod autofires, but in those cases, the display was changing.

Could be a faulty chipset.

 

[KOR3Vapez]

This video is my iStick autofiring. The pics are of the iStick torn down. I read ppl having issues with the fie button wearing out... I disassembled my button (pic) and tested the 510 with my multimeter and its still autofiring even with the device powered down. I am at a loss. I just dont know enough about the PCB to use my multimeter to check for shorts. If anyone has ideas I'll be more than happy to test and post results.

 

[blujeenz]

I can only think of 2 reasons for auto firing once the wiring and pcb has checked out visually good.

• fire button has permanent short
• the mosfet has a short, mosfet = power transistor ie digital switch.

You would need a DMM to check for shorts, well as removing batt power to the pcb, not just the 510 connector.

In the @KOR3Vapez instance where its firing after being 5 clicked off, my educated guess would be the mosfet having a short between the Drain and Source legs. Desolder the mosfet and remove the ic to see if auto firing stops.