Hacking Hardware Picofly - a HWFLY switch modchip

[CodyRoseman]

Thank you for the reply, seems I edited my comment too late. What about the pull-down? Is it needed with fuel mosfet? I didn’t add it on the first mod I performed.

Did you have a pull down on the gate?

 

[abal1000x]

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[cgtchy0412]

Any suggestion on any dual channel mosfet, as the possibility of soldering two caps with one mosfet in one go is intriguing enough for me, coz i always avoid using dual mosfet because it needs two separate mosfet.
A few i found at least in my local e-shop is always assimetric one or one with high rdson value.
Ideally it should be dual independent mosfet in one package with rdson < 10 miliohm @4.5v.

 

[Adran_Marit]

Any suggestion on any dual channel mosfet, as the possibility of soldering two caps with one mosfet in one go is intriguing enough for me, coz i always avoid using dual mosfet because it needs two separate mosfet.
A few i found at least in my local e-shop is always assimetric one or one with high rdson value.
Target is should be dual indenpendent mosfet in one package with rdson < 10 microohm.

See the board a page ago

 

[CodyRoseman]

Any suggestion on any dual channel mosfet, as the possibility of soldering two caps with one mosfet in one go is intriguing enough for me, coz i always avoid using dual mosfet because it needs two separate mosfet.
A few i found at least in my local e-shop is always assimetric one or one with high rdson value.
Ideally it should be dual independent mosfet in one package with rdson < 10 microohm @4.5v.

the IRFHS8342 has an rdson of ~[email protected] Vgs, you don't need < 10mohm

 

[cgtchy0412]

See the board a page ago

RdsOn too high, as it in single mosfet dont work maybe only AON brand, and cannot test it also as it is not easily found near my location. Will wait for op to test that.

 

[abal1000x]

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[CodyRoseman]

yes so long

If i put the mosfet outside the shield, and connect it with wire, in your opinion does it still works sir?

yes, i've had wires about 10cm in length while testing.

 

[cgtchy0412]

If i put the mosfet outside the shield, and connect it with wire, in your opinion does it still works sir?

Somebody need to test this, how long can a Drain to Caps wire be and still can glitch. Also different wires? Also beware of false positive, when it works on test case but cannot survive long enough cycle.

 

[abal1000x]

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[CodyRoseman]

RdsOn too high, as it in single mosfet dont work maybe only AON brand, and cannot test it also as it is not easily found near my location. Will wait for op to test that.

https://www.digikey.my/en/products/detail/texas-instruments/CSD85301Q2/5114820
https://www.lcsc.com/product-detail/MOSFETs_Texas-Instruments-CSD85301Q2_C544396.html

Post automatically merged: May 30, 2023

Thank you for confimation sir.
This is a great news. So we basically could take that mosfet out from the apu.
I have tried that lot of time, but the glitch doesn't work. Maybe the 8342 is not suited for that.

I had dual IRFHS8342 dangling from wires, and they glitched a Mariko

 

[abal1000x]

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[lightninjay]

https://www.digikey.my/en/products/detail/texas-instruments/CSD85301Q2/5114820
https://www.lcsc.com/product-detail/MOSFETs_Texas-Instruments-CSD85301Q2_C544396.html

Post automatically merged: May 30, 2023

I had dual IRFHS8342 dangling from wires, and they glitched a Mariko

Welp, I just ordered five from Mouser.com, so we'll see how well they work for me

 

[CodyRoseman]

What diameter / awg the wire you use sir?

30 guage, 0.25mm

 

[abal1000x]

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[lightninjay]

Your board is unique then.
Every board i meet put the mosfet inside the apu via flex cable or manually.

TBF, 30awg allows for some pretty decent resistances. (disclaimer, I have been drinking) I did a lot of my very first install with long wiring, and all my glitches were successful with 30awg kynar wire. As long as solid connection is made, and you have good enough resistances to make glitch timings, I cannot see the fault.

 

[abal1000x]

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[cgtchy0412]

30 guage, 0.25mm

Can you check what emmc is on your board?

 

[CodyRoseman]

Can you check what emmc is on your board?

I don't have that switch anymore, it was probably Samsung

Post automatically merged: May 30, 2023

Can you check what emmc is on your board?

I've used 30awg on ~8 oleds, v1, v2 switches, they all work fine

 

[cgtchy0412]

I don't have that switch anymore, it was probably Samsung

Post automatically merged: May 30, 2023

I've used 30awg on ~8 oleds, v1, v2 switches, they all work fine

Just to be clear, did you put the mosfet outside cpu shield on those 8 oleds?