• Lenovo IdeaPad 5Pro-16IHU6 - Grzejące się tranzystory QT6201 i QT6202

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#1 Lenovo IdeaPad 5Pro-16IHU6 - Grzejące się tranzystory QT6201 i QT6202


by pawel5196 29 August 2025, 15:11
Witam.
Laptop - Lenovo IdeaPad 5Pro-16IHU6
Płyta główna - nb3036_mb_v4
Wypalone PCB oraz uszkodzone mosfety QT6201 i QT6202. Według schematu siedzą tam PE5E4BA oraz PE5E6BA. Brak dostępności w PL. Zamówiłem AON7318. Wstawiłem zamiast oryginalnych.
Płyta uruchamia się, lecz oba tranzystory bardzo mocno się nagrzewają.
Napięcia:
QT6202:
n1,2,3 - 20V
n4 - 20.5V
n5 - 19.4V
QT6201:
n1,2,3 - 19.4V
n4 - 20.5V
n5 - 18.2V
Spotkał się ktoś z takim problemem? Czy może trzeba wstawić identyczne tranzystory jak były?
Z góry dzięki za pomoc.
EDIT:
Jak dobrze sądzę, problemem może być sterowanie bramkami traznsytorów. Za niskie napiecie. Sygnay idą do TPS65994A. Dobrze myślę?
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Re: Lenovo IdeaPad 5Pro-16IHU6 - Grzejące się tranzystory QT6201 i QT6202


by Google Adsense [BOT] 29 August 2025, 15:11

#2 Re: Lenovo IdeaPad 5Pro-16IHU6 - Grzejące się tranzystory QT6201 i QT6202


by matic 29 August 2025, 16:35
pawel5196 wrote:Jak dobrze sądzę, problemem może być sterowanie bramkami traznsytorów. Za niskie napiecie. Sygnay idą do TPS65994A. Dobrze myślę?
Hello!
Yes, true.

Measure the voltages to ground on listed points:
- On pin 1 of transistor QT6001.
- On the cathode (- pin) of diodes DT5701, DT5702.
- Directly on capacitors CT5710, CT5711, CT5712.

#3 Re: Lenovo IdeaPad 5Pro-16IHU6 - Grzejące się tranzystory QT6201 i QT6202


by pawel5196 1 September 2025, 09:23
QT6001 pin1 - Brak jednoznaczenego pomiaru. Ok 4MΩ.
DT5701 - To samo. Brak jednoznaczenego pomiaru. Ok 4MΩ.
DT5702 - o samo. Brak jednoznaczenego pomiaru. Ok 4MΩ.
CT5710 - 13kΩ
CT5711 - 800kΩ
CT5712 - 49kΩ

EDIT:
Wymiana TPS65994A rozwiąza problme. Teraz na sterowaniu QT6001 oraz QT6002 mam 28V.
Dzięki za potwierdzenie.

Re: Lenovo IdeaPad 5Pro-16IHU6 - Grzejące się tranzystory QT6201 i QT6202


by Google Adsense [BOT] 1 September 2025, 09:23

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