# ESP32 Link: after connecting to TX/RX, Wi‑Fi disappears; it turned out to be a wiring/GPIO mix-up

**URL:** <https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736>\
**Category:** Firmware / Klipper / Portal\
**Created:** [March 17, 2026, 1:25pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736 "2026-03-17T13:25:43Z")\
**Posts on this page:** 19\
**Page:** 1

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**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 1:25pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/1 "2026-03-17T13:25:43Z")

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Hey everyone.  
Please help, good people.  
I bought this ESP32, it gets detected, flashes fine, connects to Wi-Fi, but  
that only lasts until I solder onto TX/RX (or even just plug in the pin header)  
What do I do?  
 ![](https://forum.idryer.org/uploads/default/original/2X/8/826ab3d092be3dc2de77a4b8498ecb434546eb77.jpeg)

![](https://forum.idryer.org/uploads/default/original/2X/7/7398101a2e84a793190c57af41d50ce543ed6344.jpeg)

> **🇷🇺 Оригинал**
>
> всем привет.  
> поможите люди добрые  
> я прикупил вот такую esp32, определяется, шьётся, к wi-fi подключается, но  
> до того момента как я подпаиваюсь к tx/rx (ну или просто гребёнку вставляю)  
> как быть?  
> ![](https://forum.idryer.org/uploads/default/original/2X/8/826ab3d092be3dc2de77a4b8498ecb434546eb77.jpeg)
> 
> ![](https://forum.idryer.org/uploads/default/original/2X/7/7398101a2e84a793190c57af41d50ce543ed6344.jpeg)

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**Author:** ![andrey\_kekht\_ko\_b5c0](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/9de053/32.png) [@andrey\_kekht\_ko\_b5c0](https://forum.idryer.org/u/andrey_kekht_ko_b5c0)\
**Post date:** [March 17, 2026, 1:50pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/2 "2026-03-17T13:50:23Z")

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And if you desolder it afterward, does it start working again?

> **🇷🇺 Оригинал**
>
> А если потом отпаиваешься опять работает?

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**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 1:51pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/3 "2026-03-17T13:51:15Z")

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Tried it on 2 of them

Doesn’t apply to GND and +5 🙂 just in case  
it works with those

> **🇷🇺 Оригинал**
>
> пробовал на 2х штуках
> 
> земли и +5 это не касается 🙂 если что  
> с ними работает

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**Author:** ![andrey\_kekht\_ko\_b5c0](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/9de053/32.png) [@andrey\_kekht\_ko\_b5c0](https://forum.idryer.org/u/andrey_kekht_ko_b5c0)\
**Post date:** [March 17, 2026, 1:53pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/4 "2026-03-17T13:53:02Z")

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Well, it’s one of two things here: either you need to wash off the leftover flux really well, or start checking where you’re getting an open/short

> **🇷🇺 Оригинал**
>
> Ну тут одно из двух - или надо хорошенько промыть от остатков флюса, либо уже смотреть где обрыв/кз ловишь

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**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 1:56pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/5 "2026-03-17T13:56:11Z")

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If I do it like this, it doesn’t work 🙂  
without soldering  
if I remove it, it works  
 ![](https://forum.idryer.org/uploads/default/original/2X/a/a2fee18115cdad2dc4a3476f71155cfd201415cf.jpeg)

> **🇷🇺 Оригинал**
>
> если вот так сделать - не работает 🙂  
> без пайки  
> если убрать - работает  
> ![](https://forum.idryer.org/uploads/default/original/2X/a/a2fee18115cdad2dc4a3476f71155cfd201415cf.jpeg)

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<div class="post-metadata">

**Author:** ![andrey\_kekht\_ko\_b5c0](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/9de053/32.png) [@andrey\_kekht\_ko\_b5c0](https://forum.idryer.org/u/andrey_kekht_ko_b5c0)\
**Post date:** [March 17, 2026, 2:12pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/6 "2026-03-17T14:12:04Z")

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Weird… Either whatever you’re placing it on is conductive, or… you need saving — there’s something inductive working near you that’s inducing current on the header pins

> **🇷🇺 Оригинал**
>
> Чудеса… Либо то, на что ты ее кладешь проводит ток, либо … спасаться надо - рядом с тобой работает индуктивность, которая на пинах гребенки наводит ток

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**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:20pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/7 "2026-03-17T14:20:10Z")

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Hmm, well, all of this was lying on a silicone mat. And nearby there’s a monitor and a UPS

Oh, and the soldering station was turned on 🙂

> **🇷🇺 Оригинал**
>
> хм, ну лежало это все на силиконовом коврике. а рядом монитор и ибп
> 
> а ну паяльная станция включена была 🙂

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**Author:** ![vladislav\_kuzin\_194](https://forum.idryer.org/letter_avatar_proxy/v4/letter/v/8baadc/32.png) [@vladislav\_kuzin\_194](https://forum.idryer.org/u/vladislav_kuzin_194)\
**Post date:** [March 17, 2026, 2:22pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/8 "2026-03-17T14:22:36Z")

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I saw somewhere that these mats pick up all kinds of weird crap, try it on the best insulator in the world (a sheet of A4 paper)

> **🇷🇺 Оригинал**
>
> где-то видел, что эти коврики ловят всякую дичь, попробуй на лучшем изоляторе в мире (лист а4)

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<div class="post-metadata">

**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:23pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/9 "2026-03-17T14:23:18Z")

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I’ll try it, but the mat is only there for the photo, I was actually holding it in the air

> **🇷🇺 Оригинал**
>
> попробую, но коврик тут для фото только, так то на весу держал

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**Author:** ![ruslan\_p\_261](https://forum.idryer.org/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ruslan\_p\_261](https://forum.idryer.org/u/ruslan_p_261)\
**Post date:** [March 17, 2026, 2:23pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/10 "2026-03-17T14:23:42Z")

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What exactly did you solder where, that it’s not working?

> **🇷🇺 Оригинал**
>
> Что куда паял, что не работает?

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**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:24pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/11 "2026-03-17T14:24:04Z")

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According to the Chinese diagram, 20 and 21

> **🇷🇺 Оригинал**
>
> по китайской схеме 20 и 21

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<div class="post-metadata">

**Author:** ![ruslan\_p\_261](https://forum.idryer.org/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ruslan\_p\_261](https://forum.idryer.org/u/ruslan_p_261)\
**Post date:** [March 17, 2026, 2:24pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/12 "2026-03-17T14:24:19Z")

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Where’s the diagram from? [iz chata]

> **🇷🇺 Оригинал**
>
> Откуда схема? [iz chata]

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<div class="post-metadata">

**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:24pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/13 "2026-03-17T14:24:30Z")

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From the product page

You think they lied?

No, the question is which one? There wasn’t any other documentation for the product

> **🇷🇺 Оригинал**
>
> со страницы товара
> 
> думаешь солгали?
> 
> нет, вопрос которую? на товар доков больше не было

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**Author:** ![ruslan\_p\_261](https://forum.idryer.org/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ruslan\_p\_261](https://forum.idryer.org/u/ruslan_p_261)\
**Post date:** [March 17, 2026, 2:26pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/14 "2026-03-17T14:26:42Z")

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The one I wrote. There are pictures there)

> **🇷🇺 Оригинал**
>
> Которую я писал. Там картинки есть)

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<div class="post-metadata">

**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:27pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/15 "2026-03-17T14:27:13Z")

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So it says there that everyone’s is different? Isn’t that right?  
I’ll go check again

> **🇷🇺 Оригинал**
>
> так там написано - у всех по своему? не так разве?  
> пойду гляну еще раз

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<div class="post-metadata">

**Author:** ![ruslan\_p\_261](https://forum.idryer.org/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ruslan\_p\_261](https://forum.idryer.org/u/ruslan_p_261)\
**Post date:** [March 17, 2026, 2:27pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/16 "2026-03-17T14:27:47Z")

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Take a look, and if anything’s unclear, write back and I’ll fix it

> **🇷🇺 Оригинал**
>
> Посмотри и что непонятно, напиши, я поправлю

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<div class="post-metadata">

**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:31pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/17 "2026-03-17T14:31:33Z")

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I did it like here  
 ![](https://forum.idryer.org/uploads/default/original/2X/b/bd3ade528f5a92fe7a50c50d9b1b4db00c2c150d.jpeg)

and here’s the Chinese one  
 ![](https://forum.idryer.org/uploads/default/original/2X/2/2b7e8523152f4ba8fb5f5ee670056ef8acfe7606.jpeg)

The problem is, I didn’t even get as far as connecting to the MCU

I mean, I flashed it, set up Wi-Fi, soldered onto it, and Wi-Fi said bye-bye  
I desoldered it, and Wi-Fi came back

> **🇷🇺 Оригинал**
>
> вот как здесь, так и делал  
> ![](https://forum.idryer.org/uploads/default/original/2X/b/bd3ade528f5a92fe7a50c50d9b1b4db00c2c150d.jpeg)
> 
> а вот укетайца  
> ![](https://forum.idryer.org/uploads/default/original/2X/2/2b7e8523152f4ba8fb5f5ee670056ef8acfe7606.jpeg)
> 
> проблема в том, что я даже не дошёл до подключения к mcu
> 
> т.е. я прошил, настроил wi-fi, подпаялся и wi-fi сказал покеды  
> отпаял - wi-fi пришёл

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<div class="post-metadata">

**Author:** ![ruslan\_p\_261](https://forum.idryer.org/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ruslan\_p\_261](https://forum.idryer.org/u/ruslan_p_261)\
**Post date:** [March 17, 2026, 2:34pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/18 "2026-03-17T14:34:38Z")

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I don’t get it. Are you flashing Link?

Does Link have instructions?

Does it say this there?  
 ![](https://forum.idryer.org/uploads/default/original/2X/7/7259f93f01e426151ad49a044ffe57cef27e5c14.jpeg)

And what else am I supposed to do so you’ll find GPIO 6 and 7 on your board?

> **🇷🇺 Оригинал**
>
> Я не понимаю. Ты шьешь Link?
> 
> Инструкция у Линка есть?
> 
> Такое там есть?  
> ![](https://forum.idryer.org/uploads/default/original/2X/7/7259f93f01e426151ad49a044ffe57cef27e5c14.jpeg)
> 
> И что ещё я должен сделать чтоб ты нашел 6й и 7й гпио на своей плате?

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<div class="post-metadata">

**Author:** ![arnis\_harchenko\_507](https://forum.idryer.org/letter_avatar_proxy/v4/letter/a/eb8c5e/32.png) [@arnis\_harchenko\_507](https://forum.idryer.org/u/arnis_harchenko_507)\
**Post date:** [March 17, 2026, 2:39pm UTC](https://forum.idryer.org/t/esp32-link-after-connecting-to-tx-rx-wi-fi-disappears-it-turned-out-to-be-a-wiring-gpio-mix-up/1736/19 "2026-03-17T14:39:14Z")

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Later then.  
If I understood correctly, according to the diagram I’m soldering to the right place,  
but Wi-Fi stops working (or the whole ESP32)  
but if I desolder it, everything works fine again  
I’m trying to figure out the reason  
maybe I messed something up?

> **🇷🇺 Оригинал**
>
> потом тогда  
> если я правильно понял - я по схеме подпаиваюсь туда, кууда надо  
> но перестаёт работать wi-fi (или esp-ха целиком)  
> но если отпаять - все работает нормально  
> я пытаюсь понять причину  
> может я чё напутал?