We replaced r2 as its part of the potential divider with a 56k resistor and the DC-DC still didn't work - the output remained the same. Really appreciate the input but its done now and works, but I'll pin your comment so people can try that first and then if that doesn't work they can go all out on it and do what we did. Thanks for the info!

Is the device working? Have you tried reading or writing firmware from ECU?

It doesn't work

I tested R1 with 47k and it worked, thanks! But I found the voltage a bit low. From calculation ideal is 52.5k. I installed a 51.1k and voltage is very close.

good morning which smd reference

RCJ Tuning My boss has never had an issue with his and he’s flashed maps fine with it multiple times. He didn’t deliberately buy a knockoff, but that’s what the Seller sent him...

@@the_equalizor I just checked and although mine functions perfect it does not light up off obd alone, only lights up once connected to the pc.

How testing SFEB

There isn't a schematic as such, but I have pasted a link to how it was wired up below, as well as a link to the Buck Converter on Aliexpress. Hope that helps. mrhangmancouk-my.sharepoint.com/:i:/g/personal/robscott_mrhangman_co_uk/EVVsUpYc59RKgS8e-qXdLi0B71p5hFeo_NqB0_i8rJKNsw?e=n5DQdJ www.aliexpress.com/item/Ultra-Small-Mini-DC-DC-Step-Down-Power-Supply-Module-3A-Adjustable-Buck-Converter-for-Arduino/32982640798.html

WooW! Thank you very much!

what happens if your getting lower voltage on other usb ports ? it wont read properly?

Yes, a couple of people have mentioned this fix and thats useful to know, but doesn't apply in our case as we changed that already. The DC-DC circuit was faulty on ours.

I confirm this works. (there are other fixes that can be made, like adding a 100uF cap on the regulator input, and a few other resistor values can be corrected as well like R3, R31, R19 , google it a bit)

Only PassThru one, not an OpenShell

Work just fine with DAS and Xentry

I've got two of them and ended up buying a real one. Every time after unplugging the adaptor from the car they fail.

Hatsanat Srianant Does it light up when plugged into the OBD port?

@@the_equalizor No, but first time I did not see any light shown when connect to my obd too (only show light when connect via USB side). Thanks for your help 😃

Hatsanat Srianant okay so are you saying that it doesn’t show any lights on usb and obd? That could be the voltage regulator has gone bad then. Iirc the 12v and usb 5 volts end up going to a 3.3v linear regulator. I’d be checking the voltage going into that (5v I think) and then it should have 3.3v coming out. If you google the part number of that regulator you’ll see which the input and the output pins are. I think it’s the 3 pin device behind the sdcard socket.

Actually they are killed (destroyed) remotely on purpose by the makers of Tactrix in the USA.

@@bn880 for real?

@@darkcashyz yes

@@darkcashyz There are modifications that can be done (not easy) to pull up the write pin on the MCU to prevent it. Otherwise don't allow internet connection when connecting the Tactrix to PC.

@@bn880 so its something on the latest ecuflash or internet also .. I think its more of the latest ecuflash has some hidden kill codes > ? has there be any fix after its been killed or some repair ? cheers

Ots easy just install driver

But original to support the company But my clone is flawless on my 01 wrx, have wrote maps at east 50 times.

Dont connect to internet during flashing, then its safe.

I don't sell these. I just repaired it. From the comments from other users who know more about these things than I do , I wouldn't buy this fake one.

Andrew Lee I haven’t done anything further with this as it wasn’t mine and my boss has done all the tuning he needed to do. Didn’t know about the kill command. Clever stuff!

Any success in unbricking?

I would think it's something in the later versions of ecuflash that would brick these fakes, just to play it safe I'll start with earlier versions of ecuflash.

@@crazyDIYguy Thanks mate have you tried other versions / if yes which ones so far works ?

Hey @andrewlee88 you mind sending those pictures over?! Tyia.

I didn't buy this, I was repairing it for someone else, but when he bought it from Amazon he believed that it was genuine and it had the price to match....

Because chinese clone is readily available including shipment. Unfortunately, to order original tactrix from US is cumbersome complicated process, with long waiting time.

the original tatrix had same problem to so its just a design problem china ones just got cold solder joints vs the original with good solder joints also usb port is weaker then the original to lol