• Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Danes je 14 Oktober 2025, 08:57

 [REŠENO] Lenovo Ideapad S340-15IWL Laptop Key stuck problem

 Pravila foruma: Klikni tukaj za prikaz pravil na forumu

  1. Naslov teme mora vsebovati: proizvajalca naprave, poln model in kratek opis okvare.
  2. Sporočilo teme mora vsebovati: oznako tiskanega vezja (v primeru popravil strojne opreme), razširjen opis okvare, kaj je bilo preverjeno, zamenjano in/ali izmerjeno, sklep in vprašanje. Če ne morete najti oznake tiskanega vezja, morate prebrati TO TEMO. Če še vedno ne najdete oznake, prosim objavite kakovostne fotografije obeh strani matične plošče - potrebno je odstraniti vse folije in module, ki bi lahko zakrivali te oznake.
  3. Pred objavo nove teme, preberite vse teme v podforumu USPOSABLJANJA, in naredite predhodno diagnostiko na podlagi vsebine teh usposabljanj.
  4. Nalaganje celotnih navodil/shem, BIOS / firmware datotek, ali objavljanje povezav, ki vodijo do drugih spletnih strani s takšnimi datotekami, je SROGO PREPOVEDANO. Lahko objavite le majhen del navodil/shem, ali povezavo na BIOS datoteko v podforumu NEVERIFICIRANE DATOTEKE BIOS/EFI. V eni temi ne smete objaviti več kot eno stran navodil/shem. Datoteka ne sme vsebovati vidnih žigov "zaupno",, e-poštnih naslovov ipd.
  5. V eni temi lahko opišete SAMO eno napravo. Za vsako drugo okvarjeno napravo morate odpreti novo temo.
  6. Zahteve za sheme, boardview, fotografije matičnih plošč, datoteke BIOS-a ali servisne priročnike za storitve NISO DOVOLJENE. Če želite vprašati za katero koli od teh, odprite novo temo v podforumu ZAHTEVA ZA DOKUMENTACIJO & DATOTEKO BIOS/EFI.

#1 Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 21 September 2025, 17:58
Model : Lenovo Ideapad S340-15IWL Type 81N8
Board id: EL5C3 EL531 EL431 LA-H101P REV 1.0

Problem is "q" Key is stuck and appear repeadely without Keyboard. I flash BIOS from supported original lenovo website and BIOS and EC version are changed. But problem still exits. There is nothing (Capacitor, Diode, etc ... ) on Keyboard circuit line. All are directetly connect with EC. Need help.

Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a Google Adsense [BOT] • 21 September 2025, 17:58

#2 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a Vogelek23 • 21 September 2025, 22:35
Disconnect the keyboard while in the app (eg. Notepad) and check if "q" letter is still typed. If NOT, replace the keyboard. If SO, replace the EC.

#3 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 27 September 2025, 16:39
I already tested with disconnect keyboard. When i replace EC, can i need to reprogram?

#4 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a matic • 29 September 2025, 08:20
If you will use a brand new KBC chip (or a erased one), it should automatically program itself the first time you connect the power supply to the board.

#5 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 5 Oktober 2025, 09:47
I replaced EC with another EC from exectly same laptop ( same model and board id ). But problem still exit. "q" key is still stucked and appear repeadely without Keyboard.

#6 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a matic • 5 Oktober 2025, 11:23
Measure the voltages to ground on all pins of the keyboard connector while the machine is booted into the OS with the keyboard disconnected.

#7 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 6 Oktober 2025, 17:32
Pin 2,7,8,9,11,12,15,18 - 3.3V
Pin 13,14 - 3.2V
Pin 32 - 5V

All other pins have 0V.

#8 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a matic • 9 Oktober 2025, 12:19
cygron napisal/-a:Pin 13 - 3.2V
And here the problem is. This pin should be 0V.

Lift the pin 39 of the KBC chip (or cut the copper trace connected to this pin). Then remeasure the voltage to ground on pin 13 of the keyboard connector while the machine is booted into the OS with the keyboard disconnected.

#9 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 10 Oktober 2025, 07:03
i cut the copper trace connected to this pin. the voltage to ground on pin 13 is still 3.2v but key struck is gone.

#10 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a matic • 10 Oktober 2025, 08:21
Everything points to a short circuit somewhere between the inner layers of the PCB laminate.

Also cut the copper trace connected to the pin 13 of the keyboard connector and remeasure the voltage to ground on this pin while the machine is booted into the OS with the keyboard disconnected. If you measured 0V on this pin, run a kynar wire between pin 13 of the keyboard connector and pin 39 of the KBC chip.

#11 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 11 Oktober 2025, 17:48
Cut the copper trace connected to the pin 13 of the keyboard connector and the voltage is 0V. I connect a kynar wire between pin 13 of the keyboard connector and pin 39 of the KBC chip. Now everything is fine. If you don't mind, i want to ask how do you know pin 13 of keyboard connector should be 0V.

#12 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem  [REŠENO] 

Napisal/-a matic • 12 Oktober 2025, 14:21
cygron napisal/-a:i want to ask how do you know pin 13 of keyboard connector should be 0V.
In the initial state (none of the keys are pressed) all KSI (Keyboard Scanning Input) pins of the KBC chip should be 3.3V and all KSO (Keyboard Scanning Output) pins should be 0V.

#13 Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a cygron • 12 Oktober 2025, 14:56
Thank you very much for your helping and teaching. Best regards.

Re: Lenovo Ideapad S340-15IWL Laptop Key stuck problem

Napisal/-a Google Adsense [BOT] • 12 Oktober 2025, 14:56
Podobne Teme
Schemat Lenovo Yoga 730-15IWL Compal ELZP5 LA-G541P
  Lenovo S340-15API płyta LA-H131P nie włącza się  [REŠENO]
Macbook A2485 ( 820-02100-A) no power , stuck at 5V
HP x360 Chromebook 14A-CA, DA00GIMB6H0 , flooded, slow and stuck in tablet mode
Laptop ASUS X571G - problem z temperaturami
Asus GL553VD Laptop charging problem

Kdo je na strani

Po forumu brska: 0 registriranih uporabnikov in 5 gostov

_______________________________
Vse pravice pridržane. Nepooblaščeno kopiranje vsebine te spletne strani ali njenega dela je strogo prepovedano.
Vse blagovne znamke, izdelki ali storitve, objavljene na tej spletni strani, pripadajo njihovim zakonitim lastnikom, so avtorsko zaščitene in se uporabljajo samo v informativne namene.