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Dell Inspiron 15-5575 (LA-F121P Rev 1.0) Charger Unknown / Not detected
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mohammedsf [ 03 окт 2022, 03:12 ]
Заголовок сообщения:  Dell Inspiron 15-5575 (LA-F121P Rev 1.0) Charger Unknown / Not detected
Hi, this laptop came from another failed service, main problem was short of 19v to PSID and system stopped charging the battery..

PSID line checked there is 1.1v on the line, PD1 was low in resistance, the previous service installed 10K on PR1 and 100K on PR5 instead of 33ohms/2.2K :wo_ol:

Everything was replaced:

PD1 "TVNST52302AB0" replaced
PQ1 "FDV301N" replaced
PQ2 "MMST3904" replaced
PR1 = 33ohms replaced
PR5 = 2.2K replaced
PR3, PR6, PR4 checked and in normal range..

The line became 3.3v, charger still not detected/unknown (I don't have an oscilloscope to check data exchange)
if the laptop is turned off charging led goes on and the battery is charged, if turned on the charging led goes off and charging stops..

Tried multiple working adapters..

Bios & EC firmware updated, no change..

Removed PL3 and everything in the PSID line except PR1 & PR5 and soldered a direct line from the central pin to PR1, still no change

PSID pin#16 on KB9022 = 10K ohms

where to dig ?

edit: bios & ec firmware updated by official update
andr-sam.f [ 03 окт 2022, 08:47 ]
Заголовок сообщения:  Re: Dell Inspiron 15-5575 (LA-F121P Rev 1.0) Charger Unknown / Not detected
PD1 Снимите для проверки.
mohammedsf [ 03 окт 2022, 15:02 ]
Заголовок сообщения:  Re: Dell Inspiron 15-5575 (LA-F121P Rev 1.0) Charger Unknown / Not detected
andr-sam.f писал(а):
PD1 Remove for inspection.


tried, still no change
andr-sam.f [ 03 окт 2022, 16:49 ]
Заголовок сообщения:  Re: Dell Inspiron 15-5575 (LA-F121P Rev 1.0) Charger Unknown / Not detected
В таком случае если у вас нет осциллографа посмотреть вычитку, меняйте EC контроллер
mohammedsf [ 06 окт 2022, 20:26 ]
Заголовок сообщения:  Re: Dell Inspiron 15-5575 (LA-F121P Rev 1.0) Charger Unknown / Not detected
KB replaced and flashed, it works the charger is detected now :co_ol:

Here's something to note:

on the bad chip, the resistance of PSID pin#16 on KB9022 was 10K and growing very slowly to 16K, while on the good working chip it reads 16.6K fast..

secondly, non of the available dumps on the site and off did work with my board, here's working dumps for this model:

Dell Inspiron 15-5575 P75F002
CAL51 LA-F121P Rev:1.0(A00)
2018-02-08
Ryzen-7 2700U
UMA

Here..
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