• Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

It is currently 14 December 2024, 05:42

 [SOLVED] Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

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#1 Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by ppgg1 • 16 January 2024, 16:15
Pacjent jak w tytule, brak reakcji na włącznik oraz brak napięć, bardzo mocno grzeje się RT6256B. Wymieniłem układ na nowy niestety nic się nie zmieniło, nowy również bardzo mocno się grzeje.

Pomiar z zamontowanym układem:
PIN_11 (LDO3) 55 kOHM
PL_201 130 kOHM
PIN_1 4.9V
PIN_5 19V
PIN_11 1.7V
Na pozostałych pinach układu (poza 4 i 8) RT6256B rezystancje powyżej kOHM

Image

Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by Google Adsense [BOT] • 16 January 2024, 16:15

#2 Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by matic • 16 January 2024, 21:15
Hello!

Measure the resistance to ground on cathode (pin 1) of diode DU12.

#3 Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by ppgg1 • 17 January 2024, 22:09
Measure the resistance to ground on cathode (pin 1) of diode DU12.


PIN_1 DU12 (cathode) 1.8 kOHM
PIN_2 DU12 (anode) 55 kOHM

#4 Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by matic • 18 January 2024, 08:29
Measure the resistance to ground on pin 9 of chip PU202.
If the resistance is high (in kΩ range or greater), remove this chip from the board and inject 3.3V from the laboratory power supply to the pad 11 on the place of this chip. Limit the current to 0.8A.
What electrical current flows from the laboratory power supply during the test?

#5 Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by ppgg1 • 21 January 2024, 22:53
After applying 3.3V voltage to PIN_11, there was an overload (photo_1).
I found a very hot capacitor (photo_2 and photo_3), its resistance was 400 Ohm. After dismantling the capacitor, the overload disappeared (photo_4).

Please identify the damaged capacitor.
Can I put the old PU202 on for a test run or is it better to buy a new one?

Image
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#6 Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.  [SOLVED] 

by matic • 22 January 2024, 16:22
Damaged capacitor is as follows:
CU103= 1µF/6.3V, ceramic type X5R, package 0201

#7 Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by ppgg1 • 24 January 2024, 23:01
The laptop works, thanks for your help.

Re: Acer N17H2 na płycie NX8106_MB_V5 problem z RT6256B.

by Google Adsense [BOT] • 24 January 2024, 23:01
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