• ACER Nitro 5 AN515 LA--J891P - pobór 0,8A

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#1 ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by drill 25 January 2026, 09:22
Laptop: ACER Nitro 5 AN515
Płyta: FH52M LA-J891P Rev:1A
Laptop przyszedł martwy, przywarcie na cewce PL1101 - most po stronie drivera. Po wymianie drivera płyta się uruchamia do 0,8A po czym następuje reset i znowu uruchomienie do 0,8A. Wszystkie napięcia na cewkach obecne. Dziwna sprawa to taka, że przy moście urwany jest rezystor RH3 - 10K - 0402. Na schemacie i zdjęciach w sieci widzę iż jest on obsadzony a jego wartość jak wyżej. Po wlutowaniu rezystora i przyciśnięciu pwrbtn płyta uruchamia się do 0,02A po czym spada do 0,01A. Bez tego rezystora uruchamia się znowu do 0,8A. Ktoś ma jakiś pomysł Panowie? Jeśli ktoś ma akurat taką płytę na stole, jaka jest wartość rezystora RH3?

Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by Google Adsense [BOT] 25 January 2026, 09:22

#2 Re: Nitro 5, LA--J891P - pobór 0,8A


by matic 26 January 2026, 09:02
Hello!

Measure the resistance to ground on coil PL1101.

drill wrote:Dziwna sprawa to taka, że przy moście urwany jest rezystor RH3 - 10K - 0402.
The value of this resistor - 10kΩ seems reasonable.
Measure the voltages to ground on both pins of this resistor (with the resistor soldered in place).

Inspect the entire board under a microscope for even more missing/mechanically damaged components.

#3 Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by drill 26 January 2026, 17:34
Ok, minęła noc, płyta poleżała w wygrzewaczu 60 stopni C. No i dziś po wlutowaniu rezystora 10k już się uruchamia ale dalej tak jak bez niego do 0,8A. Wyczyściłem okolice mostu KT-5 PCB Cleaner i znowu płyta się nie uruchamiała, wydmuchałem resztki spod mostu i rusza do 0,8A :evil:
RH3 pad 1: od strony mostu 0V, pad 2: +3,35V
Cewka PL1101: napięcie 1,07V, rezystancja 42,5 ohm
Reszta napięć obecna.
Robić reflow PCH?

#4 Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by matic 27 January 2026, 08:17
drill wrote:RH3 pad 1: od strony mostu 0V
Measure the resistance to ground on this pad.

#5 Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by drill 27 January 2026, 17:55
Measure the resistance to ground on this pad.

pad 1: 32,7kohm

#6 Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by matic 28 January 2026, 09:38
Are you sure there is 0V on this pin?

#7 Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by drill 28 January 2026, 20:38
Are you sure there is 0V on this pin?

Yest i tested a resistor its ok - 10k, each pad is soldered properly. pad 1: 3,35 and PCH side: 0,01V
Image

#8 Re: ACER Nitro 5 AN515 LA--J891P - pobór 0,8A


by matic 29 January 2026, 21:07
Set your multimeter to the diode test mode and measure the voltage drop to ground on the PCH side of this resistor at both polarities of the test leads.

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