• Lenovo IdeaPad L340-15IRH Gaming - brak obrazu na matrycy

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
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#1 Lenovo IdeaPad L340-15IRH Gaming - brak obrazu na matrycy


by siwypp 27 May 2024, 12:40
Pacjent IdeaPad L340-15IRH, mobo: NM-C361 rev 1.0

Dostałem laptopa w którym klient nieudolnie zmieniał taśmę matrycy. Nie daje obrazu na matrycę, na HDMI działa bez zarzutu.
Uszkodzony był bezpiecznik F3, po wymianie napięcie +LEDVDD wróciło, DISPOFF# miał ok. 1.2V, po wymianie KBC podczas gdy powinien wyświetlić obraz mamy 0V.
+LCDCDD_CON 3.2V

W systemie w ogóle nie wykrywa matrycy. Które piny są za to odpowiedzialne?

Syganał INVT_PWM ma 5ohm, chyba mamy winowajcę, ktoś potwierdzi?

Re: Lenovo IdeaPad L340-15IRH Gaming - brak obrazu na matrycy


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#3 Re: Lenovo IdeaPad L340-15IRH Gaming - brak obrazu na matrycy


by siwypp 27 May 2024, 16:28
Machine wrote:With that resistance value you have a short.


I removed R19 and pin 1 have 5ohm, so PCH is partly faulty right?
Image

#5 Re: Lenovo IdeaPad L340-15IRH Gaming - brak obrazu na matrycy


by siwypp 28 May 2024, 13:01
Thanks, thank you.

Re: Lenovo IdeaPad L340-15IRH Gaming - brak obrazu na matrycy


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