There is only one detector better than Deus - it is Deus with larger coil!

[MartinB]

Look for used Gpx which starts at 1500-1800.

I will keep an eye out for one

[ivconic]

In soil always looks so better and promising:

Once washed in water; it shows all its defects and damages:

And when there are no more findings; at least there are mushrooms:

[MartinB]

Can anyone help please?
I have been running my Deus 1 for something over ten years, but now I have a problem. The "ON" button will not switch the machine on, but it will switch off. All other functions on the button work OK. To get it working I have to plug in a power supply to the control box. (I usually use a power bank) and the machine comes to life without having to push the "ON" button. I have had this issue for some time now, but last week I decided to fit a new battery and a new front cover as I thought the button contacts might be badly worn. Unfortunately, I still have the same problem. I would be grateful if anyone could point me in the right direction as I am reluctant the spend 600GBP on a new control box. I am running version 5.2 software.

[Carl-NC]

Typically a "soft" power button triggers a solid state switch (usually a MOSFET) and at the same time the button state is read by the micro. It sounds like the solid state switch is zapped but the micro is still able to read the button. However, the micro can only read it once powered on so without the switch to kick on the power circuits it remains dead. Plugging in the power supply apparently bypasses the switch. So You would need to pop open the control box and figure out the power-on circuitry to determine likely cause of failure. This is not an easy task with an aggressive SMT board.

[MartinB]

Typically a "soft" power button triggers a solid state switch (usually a MOSFET) and at the same time the button state is read by the micro. It sounds like the solid state switch is zapped but the micro is still able to read the button. However, the micro can only read it once powered on so without the switch to kick on the power circuits it remains dead. Plugging in the power supply apparently bypasses the switch. So You would need to pop open the control box and figure out the power-on circuitry to determine likely cause of failure. This is not an easy task with an aggressive SMT board.

Thanks Carl
I was rather hoping that you might say easy fix but looks like I have a challenge on my hands. Gives me three options, carry on as I am, try and fix it or finish building the Arduino PI and Voodoo. The following video is not the same problem, but gives me an idea of where to start looking on the PCB XP Deus Metal Detector Remote Repair - No Power - Bing video

[MartinB]

I think I have traced the problem to a device with three pads. I believe it is a transistor identified as IL43C which is probably a Chinese identifier. Does anyone know what it is and what is the international equivalent?

[Carl-NC]

Often with tiny devices the real part number won't fit so they instead use what's called a "top mark." IL43C might be a top mark, and usually an Internet search won't reveal what it means. Instead, you have to look at manufacturers' top mark cross references and even those aren't easy to find. And if you start out not even knowing the manufacturer, you're in a deep hole.

I would try to figure out what components and supplies are connected to the device, that will usually tell you what it is.

[moodz]

http://vfl.ru/fotos/1c0156e727202559.html

...not sure if this is it. could not find the SMD version. PNP TRANSISTOR 2SA636

Prob just a date / manuf code.

moodz

[moodz]

...didnt help in this case but there is a handy dandy SMD code book here ... seems to be a free resource.

https://www.sphere.bc.ca/download/smd-codebook.pdf

moodz

[Skippy]

"I believe it is a transistor identified as IL43C"

More info is needed, a photo would help a lot. We need to identify the package, and see what part of the circuitry it's joined up to.
Also : Are there any other IL43C parts on the PCB ? If there are, you have the opportunity to remove the 'good' one, to measure it up, and possibly swap them over, etc.

[kt315]

is it TL431? voltage regulator.

[Altra]

I throw my guess into the hat. Maybe a BAS40 schotky diode? Like others said a photo would be helpful


All these data sheets reference a "43" as a single diode in a sot-23 package

https://www.tme.com/Document/ffd7f46...5668/bas40.pdf

https://goodarksemi.com/docs/datashe...odes/BAS40.pdf

https://www.tme.eu/Document/efcb48e0...XXSB4X_SER.pdf

https://www.vishay.com/docs/85701/bas40v.pdf

https://www.diodes.com/assets/Datash...04_-05_-06.pdf

[MartinB]

Thank you to all who have responded.
Unfortunately, there is not another IL43C on the board.
I have spent several hours today looking at top-marks but unfortunately cannot find anything conclusive. Here are photographs as requested.



The PCB is multi-layer, but all components are on one side. The bottom just houses the display.
The on/off function button connects Vb (3.7V)
to bottom left of IL43C
The bottom right of IL43C connects to a ten pin device marked 806I 1035. Again, I can't find out what this is, but I think it is the battery charging section.
The top pin of IL43C finds its way via a couple of resistors to an unknown 4 pin device marked U24 to a device marked DtO which is connected to pins 17 and 18 of the PIC24FJ128GB106.
Seems like we are trying to crack a secret code.

I think IL43C could be a transistor, so if we can't find out what it is, I will try connecting a universal PNP and a universal NPN transistor to see what happens. Not much to lose - might even release some magic smoke.

[Altra]

I can see from your photo my guess is wrong, not a single diode BAS40. All 3 leads are connected. Anyway good luck!

Soft switch circuits

https://circuitcellar.com/resources/...ower-circuits/

[Skippy]

My thoughts: pnp bipolar transistor ( maybe with internal base resistors), or p-channel mosfet.
Pin1 = base ( or gate )
Pin2 = emitter ( or source )
Pin 3 = collector ( or drain )

I think 'A8A' turns on 'IL43' , in turn switching the 4-pin device etc.

Monitor the voltage on pin1, see if it toggles due to a Power button press, see what changes on pin 3. Pin 3 may latch/stay high after the power button is released, if correctly working.