Author Topic: T12 STM32 V2.1S Soldering Station Controller - schematic etc.  (Read 39544 times)

0 Members and 1 Guest are viewing this topic.

Offline yelkvi

  • Regular Contributor
  • *
  • Posts: 66
  • Country: ru
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #100 on: May 15, 2022, 04:54:45 pm »
Here is a diagram of your board (or similar):
 

Offline Enric

  • Contributor
  • Posts: 7
  • Country: es
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #101 on: May 15, 2022, 04:56:11 pm »
on the point 1, read 24V
on the point 2, read 0V
and the chip "3" is a very small, with a magnifying glass I read "jwbmj 9ya4l" but doesn't found nothing on the internet.
 

Offline Enric

  • Contributor
  • Posts: 7
  • Country: es
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #102 on: May 15, 2022, 05:04:05 pm »
Great, I think this is the one that is dead since I don't read 3.3V at the output, what can I do?
 

Offline yelkvi

  • Regular Contributor
  • *
  • Posts: 66
  • Country: ru
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #103 on: May 15, 2022, 05:14:19 pm »
Chip "3" is a DC/DC step down converter. Looks like JW5026 (datasheet for it in the file).

Pins "5" and "4" should have an input voltage of 24 volts. And after the inductor "L1" - 3.3V.
If there is no voltage 3.3, then several options are possible:

1. Closing the circuit after "L1". To check this, you need to measure the resistance from the "L1" coil to "-".
2. The breakage of the coil itself - measure its resistance - should be almost "0".
3. Bad soldering - carefully look through all the small radio components around this microcircuit under a magnifying glass.
4. The chip itself is faulty - it needs to be replaced (if there is no JW5206, then pick up an analogue).
 
The following users thanked this post: Enric

Offline Enric

  • Contributor
  • Posts: 7
  • Country: es
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #104 on: May 15, 2022, 05:44:26 pm »
okey!
in the pass nÂș1 I measure 0.6Ohm without voltage.
2- 0.8 ohm
3 i iew all ok
4 the most possible.
is possible put a 3.3V with an external power supply? to make it easier, can I connect it to the vcc of the display?
If it worked like this, could you remove the chip and put a 3.3V AMS117? I know the footprint doesn't fit but I could mount it on another plate or aerial.
 

Offline DavidAlfa

  • Super Contributor
  • ***
  • Posts: 2867
  • Country: es
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #105 on: May 15, 2022, 05:57:04 pm »
Now remove the coil and check at which side the short is.
Could be just bad capacitor.
Hantek DSO2x1x            Drive        FAQ          DON'T BUY HANTEK! (Aka HALF-MADE)
Stm32 Soldering FW      Forum      Github      Donate
 

Offline yelkvi

  • Regular Contributor
  • *
  • Posts: 66
  • Country: ru
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #106 on: May 15, 2022, 06:00:02 pm »
2- 0.8 ohm

This is not good. Very little.
I read one topic on a Russian site. Many users had a problem with a soldering station, where the 3.3 voltage regulator is made like yours. I'm sorry, but the STM32 chip itself failed.
If possible, unsolder the controller. If the resistance increases, then the STM.
Moreover, they wrote on that forum that the stabilizer microcircuit was also out of order.
Most likely, at first it failed, and then 24 volts entered the STM.
To make the circuit more reliable, the step down converter must be set to 5 volts, and after it, set 1117 to 3.3V
 

Offline Enric

  • Contributor
  • Posts: 7
  • Country: es
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #107 on: May 15, 2022, 06:39:28 pm »
Ok, tomorrow I'm going to go find another welder and I'm going to try it.
Thank you all very much.
 

Offline floobydust

  • Super Contributor
  • ***
  • Posts: 5529
  • Country: ca
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #108 on: May 15, 2022, 06:52:17 pm »
Best to start a new repair thread for your controller. The JW5026 appears to be sole-sourced, I did not see any alternate part.
 

Offline yelkvi

  • Regular Contributor
  • *
  • Posts: 66
  • Country: ru
Re: T12 STM32 V2.1S Soldering Station Controller - schematic etc.
« Reply #109 on: May 15, 2022, 06:55:37 pm »
If you are going to buy a new STM32F103 chip, then pay attention that you need it with 64 pin (16 pin on one side). Because there are 48 pins (12 pins per side).
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf