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cannot power "on" ASUS laptop after power outage



 
 
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  #11  
Old October 15th 15, 09:42 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Adam
external usenet poster
 
Posts: 377
Default cannot power "on" ASUS laptop after power outage


"Jonathan N. Little" wrote in message
...
Adam wrote:
"Johnny" wrote in message
news:[email protected]
On Thu, 15 Oct 2015 11:33:13 -0700
"Adam" wrote:


System: ASUS N61JQ (laptop)
Host OS: Ubuntu 12.04 LTS


After a power outage yesterday, pressing the power button of
ASUS laptop does nothing. The laptop was/is connected to
an APC battery backup (surge protection only) outlet (via AC adapter).
AC adapter's green light is "on".

Any ideas?


If you are lucky, there may be a fuse by the power jack inside the
laptop.



Thanks, do you mean the fuse may be blown and needs to be replaced?
If so, this is new territory for me so let me see if I can find a DIY
article.


1) Is the battery charged, Dell have a nice push button indicator on
battery but I don't this Asus do.



Thanks, if AC adapter is plugged in, does battery charged matter as much?

Here's the ASUS N61JQ User Manual...
http://www.lpmanual.com/manuals/asus/ASUS_N61Jq.pdf

Doesn't seem like the ASUS N61JQ has a push button indicator on battery.


2) If battery good but doesn't do anything...keyboard lights etc then you
may have fried motherboard


I don't recall ever seeing lights (keyboard, etc.) when
system is not powered "on".

I hope nothing is fried.


3) If it boots with just the battery, but nothing with battery removed and
just using the powercord/supply, then test power cord with meter.


Not my case/scenario.


If powercord/supply is good then your may have the input jack fuse blown.
Not for the novice to fix. See images here of likely locations.


Don't know yet. Need to make access first. Why me? :-)


https://www.google.com/search?q=asus+laptop+fuse+on+motherboard&tbm=isch& tbo=u&source=univ&sa=X&ved=0CB0QsARqFQoTCOmgw5Wixc gCFYXXHgodKtIO4w&biw=1080&bih=859

We are talking about soldering on the motherboard...


Soldering? No way. Not me. :-)


--
Take care,

Jonathan
-------------------
LITTLE WORKS STUDIO
http://www.LittleWorksStudio.com



  #12  
Old October 16th 15, 01:11 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
DecadentLinuxUserNumeroUno
external usenet poster
 
Posts: 177
Default cannot power "on" ASUS laptop after power outage

On Thu, 15 Oct 2015 11:33:13 -0700, "Adam" Gave us:


System: ASUS N61JQ (laptop)
Host OS: Ubuntu 12.04 LTS


After a power outage yesterday, pressing the power button of
ASUS laptop does nothing. The laptop was/is connected to
an APC battery backup (surge protection only) outlet (via AC adapter).
AC adapter's green light is "on".

Any ideas?

I did a simple google search...

https://www.google.com/?gws_rd=ssl#q...er+requirement

It yielded listings for where to get replacement 90W adapters, but
scrolling down the page shows a lot of chatroom queries surrounding
problems with this particular laptop and its batteries and power supply.

It also lists the circumstances under which the failure modes are
occurring.

It would appear that the battery "watchdog" circuitry Asus
incorporated into at least this model of their laptop line has some
problems.

A slight dip in the output of the power adapter or even too much
ripple voltage presented by it when loaded may be what is going on.

The new ones seemed to only be $12 to $15. It might cause less hair
loss to simply get a new one. It is always nice to have backup power
supplies in the "dongle" or "wallwart" realm anyway, since most are
ultrasonically sealed and unserviceable.
  #13  
Old October 16th 15, 02:23 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Paul
external usenet poster
 
Posts: 13,411
Default cannot power "on" ASUS laptop after power outage

Adam wrote:
System: ASUS N61JQ (laptop)
Host OS: Ubuntu 12.04 LTS


After a power outage yesterday, pressing the power button of
ASUS laptop does nothing. The laptop was/is connected to
an APC battery backup (surge protection only) outlet (via AC adapter).
AC adapter's green light is "on".

Any ideas?



The attachments in this thread may help.

"ASUS N61JQ won't start"
http://www.badcaps.net/forum/showthread.php?t=42461

You need an account to access the attachments. The
mainboard schematic is for a member of the same family,
but might not be exactly the same as your mainboard.
(The circuit may use different component values for
65W versus 90W designs.)

The first MOSFET (one circled on a schematic page),
is an inrush limiter. If the AC adapter is "hot" and then
plugged into the barrel connector, a lot of current
would flow for a short period of time. Instead, the
inrush limiter gradually turns on the power, using an RC
circuit tied to the gate. And the inrush limiter
prevents the overcurrent inside the AC adapter
from getting tripped.

I don't see a fuse in that schematic. It's possible
if a fuse is present, it sits in front of a clamp diode.
If, somehow, reverse bias is applied to the barrel
of the power connector, the clamp diode starts to
conduct (protecting the motherboard). The fuse would be
there, so the clamp diode doesn't burn out. Otherwise,
the AC adapter has its own current limiting inside
the adapter, so doesn't really need a fuse at the
motherboard level.

What I learned from that thread, is "look for burned stuff" :-)
That's better than trying to decode that schematic...

Paul
  #14  
Old October 16th 15, 05:19 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Adam
external usenet poster
 
Posts: 377
Default cannot power "on" ASUS laptop after power outage


"DecadentLinuxUserNumeroUno" wrote in message
...
On Thu, 15 Oct 2015 11:33:13 -0700, "Adam" Gave us:


System: ASUS N61JQ (laptop)
Host OS: Ubuntu 12.04 LTS


After a power outage yesterday, pressing the power button of
ASUS laptop does nothing. The laptop was/is connected to
an APC battery backup (surge protection only) outlet (via AC adapter).
AC adapter's green light is "on".

Any ideas?


I did a simple google search...

https://www.google.com/?gws_rd=ssl#q...er+requirement

It yielded listings for where to get replacement 90W adapters, but
scrolling down the page shows a lot of chatroom queries surrounding
problems with this particular laptop and its batteries and power supply.

It also lists the circumstances under which the failure modes are
occurring.

It would appear that the battery "watchdog" circuitry Asus
incorporated into at least this model of their laptop line has some
problems.

A slight dip in the output of the power adapter or even too much
ripple voltage presented by it when loaded may be what is going on.

The new ones seemed to only be $12 to $15. It might cause less hair
loss to simply get a new one. It is always nice to have backup power
supplies in the "dongle" or "wallwart" realm anyway, since most are
ultrasonically sealed and unserviceable.


Thanks, are you referring to the AC adapter or the battery pack?


  #15  
Old October 16th 15, 05:37 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Adam
external usenet poster
 
Posts: 377
Default cannot power "on" ASUS laptop after power outage


"Paul" wrote in message
...
Adam wrote:
System: ASUS N61JQ (laptop)
Host OS: Ubuntu 12.04 LTS


After a power outage yesterday, pressing the power button of
ASUS laptop does nothing. The laptop was/is connected to
an APC battery backup (surge protection only) outlet (via AC adapter).
AC adapter's green light is "on".

Any ideas?


The attachments in this thread may help.

"ASUS N61JQ won't start"
http://www.badcaps.net/forum/showthread.php?t=42461


Thanks (Guru Paul), that's such a cool website.


You need an account to access the attachments. The
mainboard schematic is for a member of the same family,
but might not be exactly the same as your mainboard.
(The circuit may use different component values for
65W versus 90W designs.)

The first MOSFET (one circled on a schematic page),
is an inrush limiter. If the AC adapter is "hot" and then


If "hot" means to the touch,
I just felt the ASUS AC adapter and
it does not even feel warm.

For comparison, I also felt my DELL AC adapter and
it feels warm (but not hot).

Both laptops are not powered "on".

So, DecadentLinuxUserNumeroWhat (haha) may be onto something.
Sorry, DecadentLinuxUserNumeroUno, I couldn't resist. :-)

Where's the best chance of getting a compatible AC adapter?
Fry's? Radio Shack? Other?


plugged into the barrel connector, a lot of current
would flow for a short period of time. Instead, the
inrush limiter gradually turns on the power, using an RC
circuit tied to the gate. And the inrush limiter
prevents the overcurrent inside the AC adapter
from getting tripped.

I don't see a fuse in that schematic. It's possible
if a fuse is present, it sits in front of a clamp diode.
If, somehow, reverse bias is applied to the barrel
of the power connector, the clamp diode starts to
conduct (protecting the motherboard). The fuse would be
there, so the clamp diode doesn't burn out. Otherwise,
the AC adapter has its own current limiting inside
the adapter, so doesn't really need a fuse at the
motherboard level.

What I learned from that thread, is "look for burned stuff" :-)
That's better than trying to decode that schematic...

Paul


I haven't disassembled the laptop yet but nothing smells burnt.


  #16  
Old October 16th 15, 05:39 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Marek Novotny
external usenet poster
 
Posts: 1
Default cannot power "on" ASUS laptop after power outage

On 2015-10-16, Adam wrote:
Where's the best chance of getting a compatible AC adapter?
Fry's? Radio Shack? Other?


ebay.

--
Marek Novotny
https://github.com/marek-novotny
  #17  
Old October 16th 15, 06:19 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Adam
external usenet poster
 
Posts: 377
Default cannot power "on" ASUS laptop after power outage


"Marek Novotny" wrote in message
...
On 2015-10-16, Adam wrote:
Where's the best chance of getting a compatible AC adapter?
Fry's? Radio Shack? Other?


ebay.


I had bad experience with eBay.
Seller asked me to return an item (a video card) but
did not give me a refund.



--
Marek Novotny
https://github.com/marek-novotny



  #18  
Old October 16th 15, 08:47 PM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Cybe R. Wizard[_2_]
external usenet poster
 
Posts: 15
Default cannot power "on" ASUS laptop after power outage

On Fri, 16 Oct 2015 09:39:10 -0700
Marek Novotny wrote:

On 2015-10-16, Adam wrote:
Where's the best chance of getting a compatible AC adapter?
Fry's? Radio Shack? Other?


ebay.

China.

Seriously, sometimes it is ridiculously cheap and quick to shop
directly (online) in China (Caveat Emptor). I got replacement batteries
for my PengPod in less than a week for less than I would have paid
locally /IF/ they had even been available, which they were not.

Cybe R. Wizard
--
Nice computers don't go down.
Larry Niven, Steven Barnes
"The Barsoom Project"
  #19  
Old October 17th 15, 12:18 AM posted to alt.comp.periphs.mainboard.asus,alt.os.linux.ubuntu,comp.sys.laptops
Computer Nerd Kev
external usenet poster
 
Posts: 65
Default cannot power "on" ASUS laptop after power outage

In comp.sys.laptops Cybe R. Wizard wrote:
On Fri, 16 Oct 2015 09:39:10 -0700
Marek Novotny wrote:

On 2015-10-16, Adam wrote:
Where's the best chance of getting a compatible AC adapter?
Fry's? Radio Shack? Other?


ebay.

China.

Seriously, sometimes it is ridiculously cheap and quick to shop
directly (online) in China (Caveat Emptor). I got replacement batteries
for my PengPod in less than a week for less than I would have paid
locally /IF/ they had even been available, which they were not.


Though it should be noted that you take your life into your hands with
some of the cheap power supplies that come out of that country, not to
mention the life of your equipment. Poor rectification, filtering,
regulation etc. threaten your stuff, dirt cheap components and track
spacing (distance between mains and low voltage parts on the circuit
board) threaten your life if it picks the wrong time to go wrong.

That said, if there's suspicion that the original ASUS power supply
had issues as well, I'm not sure exactly what to recommend without
looking into it deeper.

--
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#_ |\| | _#
 




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