• Dell Inspiron 15 7579 - nie reaguje, zwarcie

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#1 Dell Inspiron 15 7579 - nie reaguje, zwarcie


by Bitpc 26 June 2019, 13:54
Starlord13_b
15264-1
X41DX$BA
KBC MICROCHIP MEC1404NU

Laptop początkowo nie reagował wcale, okazało się, że przebity był kondensator, wylutowałem go i pozbyłem się zwarcia.
Image
Teraz po podłączeniu zasilacza jest pobór 0,6 - 0.67A i napięcie na cewkach:
PL5201 1.01V
PL4502 5.19V
PL4501 3.44V
Przetwornica PU4501 i cewka PL4501 mocno się nagrzewają, KBC ciepłe.
Po podłączeniu zasilacza w miejsce cewki PL4501 jest zwarcie, ale nie mogę zlokalizować żadnego grzejącego się elementu.

Re: Dell Inspiron 15 7579 - nie reaguje, zwarcie


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#2 Re: Dell Inspiron 15 7579 - nie reaguje, zwarcie


by matic 26 June 2019, 18:59
Hello!

What is an actual resistance to ground on coil PL4501?

Bitpc wrote:Po podłączeniu zasilacza w miejsce cewki PL4501 jest zwarcie, ale nie mogę zlokalizować żadnego grzejącego się elementu.
At which electrical current did you perform a short circuit test? What was the voltage on the power supply at that current?

#3 Re: Dell Inspiron 15 7579 - nie reaguje, zwarcie


by Bitpc 27 June 2019, 09:25
matic wrote:
What is an actual resistance to ground on coil PL4501?


matic wrote: At which electrical current did you perform a short circuit test? What was the voltage on the power supply at that current?

up to 3A 3.2V

//Posts merged

Found it. I performed short circuit test on PL4501 coil pad one more time, and smaller die on hybrid package got hot, at 3.2V 3A PSU stopped showing short circuit warning.

#4 Re: Dell Inspiron 15 7579 - nie reaguje, zwarcie


by matic 27 June 2019, 19:17
Bitpc wrote:I performed short circuit test on PL4501 coil pad one more time, and smaller die on hybrid package got hot
It explains everything. Unfortunately the PCH part of the APU hybrid is bad for sure.

Re: Dell Inspiron 15 7579 - nie reaguje, zwarcie


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