• Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

It is currently 14 December 2024, 06:37

 [SOLVED] Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

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#1 Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by matrixmm • 18 November 2024, 14:30
Cześć, mam na stole notebooka Lenovo Legion 5 Pro. Płyta NM-D562 rev:2.0.
Płyta nie uruchamia się. Zaobserwowałem niskie napięcie (2,5V) na PR5401. Sprawdziłem mosfety: PQ54001, PQ5402, PQ5403, PQ5404, PQ5407. Mosfety sprawne, brak zwarć na około. Zauważyłem, że jak zdejmę PL6206 to charger prawidłowo uruchamia się i na PR5401 mam 19V. Dalej sprawdzam PU6201. Na cewkach PL6201 i PL6202 jest wysoka rezystancja (10-30k). Wlutowałem z powrotem cewką PL6206 i podniosłem zwory PJ6205 i PJ6206. Znowu charger nie startuje i mam 2,5V na pr5401.
Po podniesieniu zwory PJ6201 (+3VLP->+3VL). Charger startuje normalnie. Jednak Przetwornica 3V/5V nie startuje. Mam prawidłowe LDO3-3V i LDO5-5V. Natomiast brak EN1 i EN2. Rezystancja PGOOD po podłączeniu zasilania schodzi do 2Ω.
Rezystancja na rozwartej PJ6201
PJ6201
1-544kΩ
2-1MΩ
W tym miejscu utknąłem. Co jeszcze mogę sprawdzić? Podmienić przetwornicę? (nie mam takiej na miejscu).
Poniżej pomiary rezystancji na przetwornicy odłączonej płyty oraz napięć po podłączeniu zasilania.
PU6201 - RT6585C
1-5,5kΩ - 0V
2-12kΩ - 0V
3-640kΩ - 3,3V
4-20kΩ - 0V
5-60kΩ - 0V
6-100kΩ - 0V
7-103kΩ - 0V
8-32kΩ - 0V
9-infΩ - 4,5V
10-32kΩ - 0V
11-5MΩ - 0V
12-400kΩ - 19V
13-1MΩ - 5V
14-9kΩ - 0V
15-5MΩ - 0V
16-9kΩ - 0V
17-9kΩ - 4,5V
18-9kΩ - 0V
19-1,5Ω - 3,3V
20-530kΩ - 0V
Jak zawsze będę wdzięczny za wszelką pomoc.

Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by Google Adsense [BOT] • 18 November 2024, 14:30

#3 Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by matrixmm • 22 November 2024, 14:17
I'm very sorry, I must have made a mistake when transcribing.
I measured them all again.
I corrected: p.4 - 0V and p.6 - 0V.

#4 Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by Machine • 22 November 2024, 17:00
Measure the voltages on pins 12, 18, 21, 26, 70, 93, 108, 111, 112, 119, 128 of KBC.
Measure the voltages on pin 110 of the KBC in the following cases:
at power OFF
with power on pressed
at power "ON".

#5 Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by matrixmm • 22 November 2024, 18:00
UE1 KBC
12-0V
18-0V
21-0V
26-0V
70-0V
93-0V
108-0V
112-0V
119-0V
128-0V

110-
at power OFF - 0,03V
with power on pressed - 0V
at power "ON". - 0,03V

edit:
I think that when I have the PJ6201 jumper open, I do not have +3VL voltage. I guess it supplies KBC on n.26? Am I right?

#7 Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by matrixmm • 23 November 2024, 12:38
Machine wrote:Check the continuity between pin 26 of the KBC and pin 3 of PU6201.

You probably didn't notice that from the very beginning I wrote that I had the PJ6201 jumper opened (Sorry, maybe I didn't write it clearly enough). This means there is no transition between pin 3 of the PU2601 and pin 26 of the KBC.

matrixmm wrote:Po podniesieniu zwory PJ6201 (+3VLP->+3VL). Charger startuje normalnie. Jednak Przetwornica 3V/5V nie startuje. Mam prawidłowe LDO3-3V i LDO5-5V. Natomiast brak EN1 i EN2. Rezystancja PGOOD po podłączeniu zasilania schodzi do 2Ω.
Rezystancja na rozwartej PJ6201
PJ6201
1-544kΩ
2-1MΩ


matrixmm wrote:edit:
I think that when I have the PJ6201 jumper open, I do not have +3VL voltage. I guess it supplies KBC on n.26? Am I right?


When I short PJ6201, the charger does not start properly and I have a pulsating voltage of 0-2.5V on PR5401. Only opening the PJ6201 jumper causes the charger to start properly.
I made all the above measurements with the PJ6201 jumper open

Edit:
I don't know if it's good, but out of desperation I put 19V directly on B+ (in place of pin 4 of PR5401 and and PR5401 removed).
I did not observe any overload on the power supply and the 3V/5V PU6201 converter works properly. I had 3V on PL6201 and 5V on PL6202. I don't know if it's safe. I have the PJ6205 and PJ6206 jumpers open all the time.

#8 Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V  [SOLVED] 

by Machine • 23 November 2024, 16:06
Close the open PJ....
Measure the voltages on pins 3, 4, 5, 6, 11, 12, 24, 25, 28 of PU5401.
Measure the voltages on all the pins of the battery connector with and without the battery, power supply connected.

#9 Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by matrixmm • 24 November 2024, 14:50
I'm so sorry, Machine. I was a complete idiot again. The solution to the problem is absolutely trivial. My laboratory power supply has a maximum of 3A on one output. Even though it did not show any overload, it did not start the board. I paired two outputs to have 6A and the board starts up.
Once again, I am very sorry and thank you very much for your time and help. I'm closing the topic.

Re: Lenovo Legion 5 Pro. Płyta NM-D562. Nie uruchamia się przetwornice 3V/5V

by Google Adsense [BOT] • 24 November 2024, 14:50
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