Asus V555U power On problem

[salawayon]

Board info:
ASUS X555UJ
REV: 2.0

this unit won't power ON when using AC Adapter only but with good battery it will power up. when i reheated the area where the PQ8906/PQ8907 located it power up but for a short period of time only. i tried already replacing BQ24780s charging IC but the status still the same... for now i put back the original BQ24780s...

Data at BQ24780s:

Charging IC - BQ24780S

1 P CHG ACN 10 = 0.004VDC
2 P CHG ACP 10 = 0.004VDC
3 P CHG CMSRC 20 = 0.035VDC
4 P CHG ACDRV 20 = 0.001VDC
5 P CHG ACOK 10 = 0VDC
6 P CHG ACDET 10 = 2.66VDC
7 P CHG IADP 10 = 0003VDC
8 P CHG IDCHG 10 = 0VDC
9 P IMVP8 PSYS INFO = 0VDC
10 P CHG PROCHOT# 10 = 0VDC
11 P CHG SDA 10 = 0VDC
12 P CHG SCL 10 = 0VDC
13 P CHG CMPIN 10 = 0VDC
14 P CHG CMPOUT 10 = 0VDC
15 P CHG BATPRES# 10 = 0VDC
16 P CHG TB STAT# 10 = 0VDC
17 P CHG BATSRC 20 = 0.155VDC
18 P CHG BATDRV 20 = 0.048VDC
19 P CHG SRN 10 = 0.155VDC
20 P CHG SRP 10 = 0.155VDC
21 P CHG ILIM 10 = 0VDC
22 GND
23 P CHG LG 30 = 0VDC
24 P CHD REGN 20 = 6.09VDC
25 P CHG BST 30 = 5.99VDC
26 P CHG HG 30 = 0.155VDC
27 P CHG LX 30 = 0.155VDC
28 P CHG VCC 20 = 19.42VDC

thanks...

[Sephir0th]

Re: Asus V555U power On problem

ACDRV Drives the DC-IN Mosfets. The Signal isn't Coming Out and we have to find Out why. What about the DC-IN Mosfets. Did you already Tested them for internal short? Where Stops the Voltage? Check for Short to ground too.

[stingerchamp]

Re: Asus V555U power On problem

I did not understand 10, 20,30???

No voltage on CLR point, 19v missing

Prochat is 0 , adapter is bad or insufficient current

Batpress is active but SDA scl 0v

Pq8907 DC in MOSFETs?

Share schematic

Replace adapter if laptop start with battery only

Readings are not normal

[SMDFlea]

Re: Asus V555U power On problem

I did not understand 10, 20,30???

No voltage on CLR point, 19v missing

Prochat is 0 , adapter is bad or insufficient current

Batpress is active but SDA scl 0v

Pq8907 DC in MOSFETs?

Share schematic

Replace adapter if laptop start with battery only

Readings are not normal

Boardview - https://www.badcaps.net/forum/showpo...04&postcount=5

[salawayon]

Re: Asus V555U power On problem

I did not understand 10, 20,30???

No voltage on CLR point, 19v missing

Prochat is 0 , adapter is bad or insufficient current

Batpress is active but SDA scl 0v

Pq8907 DC in MOSFETs?

Share schematic

Replace adapter if laptop start with battery only

Readings are not normal

sorry, adapter is not an issue... tried adapters with ratings like 19v 3.42a and 19v 9.23a... and sorry i don't have schematics for this unit.. i only use boardview as my guide... so far i can't find any short circuit on this board... data that i wrote here were all what i got with my multimeter readings. right after PQ8906 is 0vdc...

PQ8907 = 0vdc on any pins.

for 10,20,30 things.. please see attached... i just wrote what i saw on boardview...

thanks...

[salawayon]

Re: Asus V555U power On problem

BTW, the moment i plug-in the adapter, Power On LED blinks 7times with around 1second interval and it goes off totally...

[stingerchamp]

Re: Asus V555U power On problem

First try

Hard reset by removing CMOS for 30min and hold down power button for 30 sec

Second check

https://www.asus.com/support/FAQ/1030642/



Third check DC Jack connector
Adapter is changing but DC Jack cable is same

[salawayon]

Re: Asus V555U power On problem

First try

Hard reset by removing CMOS for 30min and hold down power button for 30 sec

Second check

https://www.asus.com/support/FAQ/1030642/



Third check DC Jack connector
Adapter is changing but DC Jack cable is same

thank you for your inputs...

First:
on this unit i can't find any CMOS BATTERY to disable. and the motherboard been separated from any power source or battery for a month.

second:
the link given was for router for a rescue or recovery...

third:
i'll give it a try..

[salawayon]

Re: Asus V555U power On problem

changing DC JACK doesn't solve the problem. but reheating/reflowing all components (mosfets, resistors, capacitors and others) after DC JACK had solved the problem... it been running for 12hrs. and tried already reinstalling OS three times... but one more problem on this unit, NVIDIA 940mx chipset had error code 43. tried already installing NVIDIA drivers via driverpack and from NVIDIA support site.

[stingerchamp]

Re: Asus V555U power On problem

https://support.microsoft.com/en-us/...e-0c6190502842

Try update via device manager

[Sephir0th]

Re: Asus V555U power On problem

Did you flashed BIOS via Programmer before Sharing your Case here? I Challenged similar issue causing "wrong" BIOS flashed.