• Acer TravelMate P256 Main LA-B162P It does not turn on

Danes je 10 Januar 2025, 22:41

 [REŠENO] Acer TravelMate P256 Main LA-B162P It does not turn on

 Pravila foruma: Klikni tukaj za prikaz pravil na forumu

  1. Naslov teme mora vsebovati: proizvajalca naprave, poln model in kratek opis okvare.
  2. Sporočilo teme mora vsebovati: oznako tiskanega vezja (v primeru popravil strojne opreme), razširjen opis okvare, kaj je bilo preverjeno, zamenjano in/ali izmerjeno, sklep in vprašanje. Če ne morete najti oznake tiskanega vezja, morate prebrati TO TEMO. Če še vedno ne najdete oznake, prosim objavite kakovostne fotografije obeh strani matične plošče - potrebno je odstraniti vse folije in module, ki bi lahko zakrivali te oznake.
  3. Pred objavo nove teme, preberite vse teme v podforumu USPOSABLJANJA, in naredite predhodno diagnostiko na podlagi vsebine teh usposabljanj.
  4. Nalaganje celotnih navodil/shem, BIOS / firmware datotek, ali objavljanje povezav, ki vodijo do drugih spletnih strani s takšnimi datotekami, je SROGO PREPOVEDANO. Lahko objavite le majhen del navodil/shem, ali povezavo na BIOS datoteko v podforumu NEVERIFICIRANE DATOTEKE BIOS/EFI. V eni temi ne smete objaviti več kot eno stran navodil/shem. Datoteka ne sme vsebovati vidnih žigov "zaupno",, e-poštnih naslovov ipd.
  5. V eni temi lahko opišete SAMO eno napravo. Za vsako drugo okvarjeno napravo morate odpreti novo temo.
  6. Zahteve za sheme, boardview, fotografije matičnih plošč, datoteke BIOS-a ali servisne priročnike za storitve NISO DOVOLJENE. Če želite vprašati za katero koli od teh, odprite novo temo v podforumu ZAHTEVA ZA DOKUMENTACIJO & DATOTEKO BIOS/EFI.

#1 Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Zemog • 28 Junij 2024, 11:56
Hello everyone!
I have the Acer Travelmate P256 laptop with LA-B162P motherboard which does not respond to the power button and does not turn on any LED.
I have checked the coils with respect to ground and everything seems normal.
5VALW are present but in 3VALW I have a slightly low value 2.36V

I have made the following measurements on PU401

EN1 (1) ... 3,11V
PG (2) ... 0V
EN2 (3) ... 0,44V
OUT (4) ... 2,36V
LDO (5) ... 3,11V
BS (6) ... 2,55V
IN (7) ... 4,57V
IN (8) ... 19,90V
LX (10) ... 2,35V

I have opened PJ401 and the values ​​are practically the same except for pin 4 and 10 where the value is 2.80V

With these measurements can I say that PU401 is defective?

Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Google Adsense [BOT] • 28 Junij 2024, 11:56

#3 Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Zemog • 28 Junij 2024, 17:21
Machine napisal/-a:Measure the resistance to ground between the pads of PJ401 (PJ401 open)

PJ401 Pad1 +3VALWP.... 73,6K Pad2 +3VALW .... 7K

#4 Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a matic • 28 Junij 2024, 20:27
Check the resistor PR401 (2.2Ω) and capacitor PC403 (100nF).

#5 Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Zemog • 29 Junij 2024, 11:51
PR401 and PC403 are good

#6 Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a matic • 1 Julij 2024, 10:45
Replace the chip PU401 (SYX196BQNC).

#7 Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Zemog • 2 Julij 2024, 12:29
I have ordered the SY8208BQNC which is the one that was reflected in the schematic.
I imagine SYX196BQNC is equivalent, right?
Or have you indicated that reference for any particular reason?

#8 Re: Acer TravelMate P256 Main LA-B162P It does not turn on  [REŠENO] 

Napisal/-a matic • 8 Julij 2024, 11:59
I've a photos of this board. In this case the factory installed chip is SYX196BQNC (markings RI***).

#9 Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Zemog • 10 Julij 2024, 10:18
Today the chip arrived, I changed it and the 3.3V is now present and the laptop is already working

The chip placed was the SY8208BQN (MS4GE MS3VM MS3BB MS3BC MS...), which is the one specified in the schematic. The one removed from the motherboard had the RF4LF markings.

So the SYX196BQNC (RI*** markings), SY8208BQN (MS*** markings) and the RF4LF must be equivalent to each other.

Thanks

Re: Acer TravelMate P256 Main LA-B162P It does not turn on

Napisal/-a Google Adsense [BOT] • 10 Julij 2024, 10:18
Podobne Teme
  Acer Aspire 5749 DA0ZRLMB6D0 does not turn on  [REŠENO]
Acer H6510BD Projector - Wont turn on / Keeps crashing
  Acer Travelmate p215-54 mb. DA0Z8LMBAD1 REV:D po zalaniu, brak głównej linii.  [REŠENO]
Dell Vostro 15 3568 can't turn on
  Dell Inspiron 15 3000 Series not turn on  [REŠENO]
Asus pu551l not turn on (mainboard pu551la rev 2.0)

Kdo je na strani

Po forumu brska: 0 registriranih uporabnikov in 11 gostov

_______________________________
Vse pravice pridržane. Nepooblaščeno kopiranje vsebine te spletne strani ali njenega dela je strogo prepovedano.
Vse blagovne znamke, izdelki ali storitve, objavljene na tej spletni strani, pripadajo njihovim zakonitim lastnikom, so avtorsko zaščitene in se uporabljajo samo v informativne namene.