9:15 p.m.
On a Dell E6510 laptop, there are 4 ports: 3 USB, and 1 eSata.
The ports on the left side of the laptop are USB and eSata.
Both of these ports start losing voltage after some time of
operation, say ....1 hours to 5 hours.
I say lose voltage, because I actually hooked up a 5volt DC
tiny fan to the usb port (no HD connected to eSata port beneath it.
After about 90 minutes, the fan slowed down.
I unplugged it and connected it to the usb port on the right side
of the laptop and it imnediately resumed it's normal rpm and stayed there
until shutdown several hours later.
P.S: The voltage drop occurs on both ports on the left. The
eSata port also functions as a usb port, and the fan slowed down
on it as well.
Connecting a sata dist to the eSata port leads to the disk disappearing
from /dev when the voltage drops.
Power management is not enabled as laptop is always on AC.
Screensaver's power management is configured to never turn off monitor,
nor disks
nor suspend system ...etc.
So, what might be causing the voltage drop, and how can I prevent it
from happening?
What data do I need to gather?
11:36 p.m.
On 08/25/15 21:15, jd1008 wrote:
On a Dell E6510 laptop, there are 4 ports: 3 USB, and 1 eSata.
The ports on the left side of the laptop are USB and eSata.
Both of these ports start losing voltage after some time of
operation, say ....1 hours to 5 hours.
<>
.
did you web search or dell site?
does voltage decrease to 0.00 v?
boot to bios or a live cd/dvd. monitor voltage. if still happens,
i would guess hardware.
--
peace out.
If Bill Gates got a dime for every time Windows crashes...
...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.
CentOS GNU/Linux 6.6
tc,hago.
g
.
11:17 a.m.
On 08/25/2015 10:36 PM, g wrote:
On 08/25/15 21:15, jd1008 wrote:
> On a Dell E6510 laptop, there are 4 ports: 3 USB, and 1 eSata.
> The ports on the left side of the laptop are USB and eSata.
> Both of these ports start losing voltage after some time of
> operation, say ....1 hours to 5 hours.
<>
.
did you web search or dell site?
does voltage decrease to 0.00 v?
boot to bios or a live cd/dvd. monitor voltage. if still happens,
i would guess hardware.
There does not seem to be any google hits on what I see taking place.
Dell support is not help. They just want you to buy a new mobo.
Voltage does not go to zero - because the tiny usb fan drops it's
rpms, but does not stop. So, perhaps it is not the voltage that is dropping,
but the amperage???
1:08 p.m.
On 08/26/15 11:17, jd1008 wrote:
On 08/25/2015 10:36 PM, g wrote:
>
> On 08/25/15 21:15, jd1008 wrote:
>> On a Dell E6510 laptop, there are 4 ports: 3 USB, and 1 eSata.
>> The ports on the left side of the laptop are USB and eSata.
>> Both of these ports start losing voltage after some time of
>> operation, say ....1 hours to 5 hours.
> <>
> .
> did you web search or dell site?
>
> does voltage decrease to 0.00 v?
>
> boot to bios or a live cd/dvd. monitor voltage. if still happens,
> i would guess hardware.
>
>
There does not seem to be any google hits on what I see taking place.
Dell support is not help. They just want you to buy a new mobo.
Voltage does not go to zero - because the tiny usb fan drops it's
rpms, but does not stop. So, perhaps it is not the voltage that is dropping,
but the amperage???
.
ok, lets look at this another way...
you say you are on ac, so that _might_ eliminate battery's voltage dropping,
unless wall wart is failing, or failure in voltage regulatory circuits.
ac input from wart is rectified in laptop and then feed to the various
regulator circuits. it is possible that there may be a vlsi chip that
does all the voltage regulating by feeding control voltages to output
power transistors. voltage regulation can be done in many ways and only
the oem knows for sure, unless supplied in specs or schematic.
does laptop have indicator light to show battery/charge state, ac power
state?
do you have battery state icon on a panel that you can watch? if icon shows
a state of 100% that later drops, that will give a clue of problem being
in voltage regulator circuit or in usb port chip/s.
you really need a VOM, Volt/Ohm Meter. a fan is pp for accurate measuring
of voltage fluctuation.
with vom, you can monitor voltage output of wart to see if it drops.
for laptop, when voltage drops, as measured at usb port, you would need to
have a way to measure battery while still connected. when you state that
you have a vom, i will go into further.
because you have failure on one side and not other, tends to indicate that
each side is on a separate regulator circuit. left side regulator could be
heating up and failing.
which brings to mind, is this same laptop you inherited that had over heated
and you replace cpu, then found it to be gpu?
voltage/amperage regulator chips are of type;
cv/va = constant voltage, variable amps
ca/vv = constant amps, variable voltage
cv/ca = constant voltage, constant amps.
the 'constant' is usually fixed or settable, 'variable' will have a max
rate.
i will presume that the regulator in laptop is cv/va, so unless chip has
heat failure, amperage is not a factor.
--
peace out.
If Bill Gates got a dime for every time Windows crashes...
...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.
CentOS GNU/Linux 6.6
tc,hago.
g
.
4:59 p.m.
On 08/26/2015 12:08 PM, g wrote:
On 08/26/15 11:17, jd1008 wrote:
> On 08/25/2015 10:36 PM, g wrote:
>> On 08/25/15 21:15, jd1008 wrote:
>>> On a Dell E6510 laptop, there are 4 ports: 3 USB, and 1 eSata.
>>> The ports on the left side of the laptop are USB and eSata.
>>> Both of these ports start losing voltage after some time of
>>> operation, say ....1 hours to 5 hours.
>> <>
>> .
>> did you web search or dell site?
>>
>> does voltage decrease to 0.00 v?
>>
>> boot to bios or a live cd/dvd. monitor voltage. if still happens,
>> i would guess hardware.
>>
>>
> There does not seem to be any google hits on what I see taking place.
> Dell support is not help. They just want you to buy a new mobo.
> Voltage does not go to zero - because the tiny usb fan drops it's
> rpms, but does not stop. So, perhaps it is not the voltage that is dropping,
> but the amperage???
>
.
ok, lets look at this another way...
you say you are on ac, so that _might_ eliminate battery's voltage dropping,
unless wall wart is failing, or failure in voltage regulatory circuits.
ac input from wart is rectified in laptop and then feed to the various
regulator circuits. it is possible that there may be a vlsi chip that
does all the voltage regulating by feeding control voltages to output
power transistors. voltage regulation can be done in many ways and only
the oem knows for sure, unless supplied in specs or schematic.
does laptop have indicator light to show battery/charge state, ac power
state?
Power supply's ac-dc circuitry is external. It feeds DC to the laptop.
do you have battery state icon on a panel that you can watch?
Yes. It shows battery at 100%. I hardly every am without AC simply
because I only need the battery if and when AC goes out. In my area,
it doe shappen, albeit, not as often as it was happening elsewhere.
if icon shows
a state of 100% that later drops, that will give a clue of problem being
in voltage regulator circuit or in usb port chip/s.
No. It stays 100%.
you really need a VOM, Volt/Ohm Meter. a fan is pp for accurate measuring
of voltage fluctuation.
with vom, you can monitor voltage output of wart to see if it drops.
for laptop, when voltage drops, as measured at usb port, you would need to
have a way to measure battery while still connected. when you state that
you have a vom, i will go into further.
because you have failure on one side and not other, tends to indicate that
each side is on a separate regulator circuit. left side regulator could be
heating up and failing.
That is a possibility, because the heat exhaust vent is
next to the left
site ports.
which brings to mind, is this same laptop you inherited that had over heated
and you replace cpu, then found it to be gpu?
Nop. That laptop is fubar. it has the
same behavior as before, even less
than
one minute after powering on and booting.
voltage/amperage regulator chips are of type;
cv/va = constant voltage, variable amps
ca/vv = constant amps, variable voltage
cv/ca = constant voltage, constant amps.
the 'constant' is usually fixed or settable, 'variable' will have a max
rate.
i will presume that the regulator in laptop is cv/va, so unless chip has
heat failure, amperage is not a factor.
Well, I do not know. If it has internal
regulators, they must be
receiving DC
and regulating the DC voltage, due to the fact that the AC->DC adapter is
external to laptop.
5:56 p.m.
Set up the VOM and temp monitoring from software center. Push the system
and see if there is a corrilation with rise in temp and your loss of power.
Fred Roller
On Aug 26, 2015 5:58 PM, "jd1008" <jd1008(a)gmail.com> wrote:
On 08/26/2015 12:08 PM, g wrote:
>
> On 08/26/15 11:17, jd1008 wrote:
>
>> On 08/25/2015 10:36 PM, g wrote:
>>
>>> On 08/25/15 21:15, jd1008 wrote:
>>>
>>>> On a Dell E6510 laptop, there are 4 ports: 3 USB, and 1 eSata.
>>>> The ports on the left side of the laptop are USB and eSata.
>>>> Both of these ports start losing voltage after some time of
>>>> operation, say ....1 hours to 5 hours.
>>>>
>>> <>
>>> .
>>> did you web search or dell site?
>>>
>>> does voltage decrease to 0.00 v?
>>>
>>> boot to bios or a live cd/dvd. monitor voltage. if still happens,
>>> i would guess hardware.
>>>
>>>
>>> There does not seem to be any google hits on what I see taking place.
>> Dell support is not help. They just want you to buy a new mobo.
>> Voltage does not go to zero - because the tiny usb fan drops it's
>> rpms, but does not stop. So, perhaps it is not the voltage that is
>> dropping,
>> but the amperage???
>>
>> .
> ok, lets look at this another way...
>
> you say you are on ac, so that _might_ eliminate battery's voltage
> dropping,
> unless wall wart is failing, or failure in voltage regulatory circuits.
>
> ac input from wart is rectified in laptop and then feed to the various
> regulator circuits. it is possible that there may be a vlsi chip that
> does all the voltage regulating by feeding control voltages to output
> power transistors. voltage regulation can be done in many ways and only
> the oem knows for sure, unless supplied in specs or schematic.
>
> does laptop have indicator light to show battery/charge state, ac power
> state?
>
Power supply's ac-dc circuitry is external. It feeds DC to the laptop.
> do you have battery state icon on a panel that you can watch?
>
Yes. It shows battery at 100%. I hardly every am without AC simply
because I only need the battery if and when AC goes out. In my area,
it doe shappen, albeit, not as often as it was happening elsewhere.
if icon shows
> a state of 100% that later drops, that will give a clue of problem being
> in voltage regulator circuit or in usb port chip/s.
>
No. It stays 100%.
>
> you really need a VOM, Volt/Ohm Meter. a fan is pp for accurate measuring
> of voltage fluctuation.
>
> with vom, you can monitor voltage output of wart to see if it drops.
>
> for laptop, when voltage drops, as measured at usb port, you would need to
> have a way to measure battery while still connected. when you state that
> you have a vom, i will go into further.
>
> because you have failure on one side and not other, tends to indicate that
> each side is on a separate regulator circuit. left side regulator could be
> heating up and failing.
>
That is a possibility, because the heat exhaust vent is next to the left
site ports.
> which brings to mind, is this same laptop you inherited that had over
> heated
> and you replace cpu, then found it to be gpu?
>
Nop. That laptop is fubar. it has the same behavior as before, even less
than
one minute after powering on and booting.
>
> voltage/amperage regulator chips are of type;
>
> cv/va = constant voltage, variable amps
> ca/vv = constant amps, variable voltage
> cv/ca = constant voltage, constant amps.
>
> the 'constant' is usually fixed or settable, 'variable' will have a
max
> rate.
>
> i will presume that the regulator in laptop is cv/va, so unless chip has
> heat failure, amperage is not a factor.
>
Well, I do not know. If it has internal regulators, they must be receiving
DC
and regulating the DC voltage, due to the fact that the AC->DC adapter is
external to laptop.
--
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6:10 p.m.
On 08/26/2015 04:56 PM, fred roller wrote:
Set up the VOM and temp monitoring from software center. Push the
system and see if there is a corrilation with rise in temp and your
loss of power.
Fred Roller
These are the only vom packages I see in the repositories:
myproxy-voms.x86_64
perl-VOMS-Lite.noarch
perl-VOMS-Lite-tests.noarch
perl-voms-server.noarch
php-voms-admin.noarch
voms.x86_64
voms-api-java.noarch
voms-api-java-javadoc.noarch
voms-clients.x86_64
voms-clients-cpp.x86_64
voms-clients-java.noarch
voms-devel.x86_64
voms-doc.noarch
voms-mysql-plugin.x86_64
voms-server.x86_64
Which ones are of the essence?
On Aug 26, 2015 5:58 PM, "jd1008" <jd1008(a)gmail.com
<mailto:jd1008@gmail.com>> wrote:
On 08/26/2015 12:08 PM, g wrote:
On 08/26/15 11:17, jd1008 wrote:
On 08/25/2015 10:36 PM, g wrote:
On 08/25/15 21:15, jd1008 wrote:
On a Dell E6510 laptop, there are 4 ports: 3 USB,
and 1 eSata.
The ports on the left side of the laptop are USB
and eSata.
Both of these ports start losing voltage after
some time of
operation, say ....1 hours to 5 hours.
<>
.
did you web search or dell site?
does voltage decrease to 0.00 v?
boot to bios or a live cd/dvd. monitor voltage. if
still happens,
i would guess hardware.
There does not seem to be any google hits on what I see
taking place.
Dell support is not help. They just want you to buy a new
mobo.
Voltage does not go to zero - because the tiny usb fan
drops it's
rpms, but does not stop. So, perhaps it is not the voltage
that is dropping,
but the amperage???
.
ok, lets look at this another way...
you say you are on ac, so that _might_ eliminate battery's
voltage dropping,
unless wall wart is failing, or failure in voltage regulatory
circuits.
ac input from wart is rectified in laptop and then feed to the
various
regulator circuits. it is possible that there may be a vlsi
chip that
does all the voltage regulating by feeding control voltages to
output
power transistors. voltage regulation can be done in many ways
and only
the oem knows for sure, unless supplied in specs or schematic.
does laptop have indicator light to show battery/charge state,
ac power
state?
Power supply's ac-dc circuitry is external. It feeds DC to the laptop.
do you have battery state icon on a panel that you can watch?
Yes. It shows battery at 100%. I hardly every am without AC simply
because I only need the battery if and when AC goes out. In my area,
it doe shappen, albeit, not as often as it was happening elsewhere.
if icon shows
a state of 100% that later drops, that will give a clue of
problem being
in voltage regulator circuit or in usb port chip/s.
No. It stays 100%.
you really need a VOM, Volt/Ohm Meter. a fan is pp for
accurate measuring
of voltage fluctuation.
with vom, you can monitor voltage output of wart to see if it
drops.
for laptop, when voltage drops, as measured at usb port, you
would need to
have a way to measure battery while still connected. when you
state that
you have a vom, i will go into further.
because you have failure on one side and not other, tends to
indicate that
each side is on a separate regulator circuit. left side
regulator could be
heating up and failing.
That is a possibility, because the heat exhaust vent is next to
the left site ports.
which brings to mind, is this same laptop you inherited that
had over heated
and you replace cpu, then found it to be gpu?
Nop. That laptop is fubar. it has the same behavior as before,
even less than
one minute after powering on and booting.
voltage/amperage regulator chips are of type;
cv/va = constant voltage, variable amps
ca/vv = constant amps, variable voltage
cv/ca = constant voltage, constant amps.
the 'constant' is usually fixed or settable, 'variable' will
have a max rate.
i will presume that the regulator in laptop is cv/va, so
unless chip has
heat failure, amperage is not a factor.
Well, I do not know. If it has internal regulators, they must be
receiving DC
and regulating the DC voltage, due to the fact that the AC->DC
adapter is
external to laptop.
--
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8:14 p.m.
On Wed, Aug 26, 2015 at 05:10:34PM -0600, jd1008 wrote:
On 08/26/2015 04:56 PM, fred roller wrote:
>
>Set up the VOM and temp monitoring from software center. Push the
>system and see if there is a corrilation with rise in temp and
>your loss of power.
>
>Fred Roller
>
These are the only vom packages I see in the repositories:
myproxy-voms.x86_64
perl-VOMS-Lite.noarch
perl-VOMS-Lite-tests.noarch
perl-voms-server.noarch
php-voms-admin.noarch
voms.x86_64
voms-api-java.noarch
voms-api-java-javadoc.noarch
voms-clients.x86_64
voms-clients-cpp.x86_64
voms-clients-java.noarch
voms-devel.x86_64
voms-doc.noarch
voms-mysql-plugin.x86_64
voms-server.x86_64
Which ones are of the essence?
Perhaps I'm naive, but I assumed he meant an actual VoltOhmMeter...
Correction welcome, should I have been mistaken.
--
---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us -----------------------------
Show me your ways, O LORD, teach me your paths;
Guide me in your truth and teach me,
for you are God my Savior,
And my hope is in you all day long.
-------------------------- Psalm 25:4-5 (NIV) --------------------------------
8:22 p.m.
On 08/26/2015 07:14 PM, Fred Smith wrote:
On Wed, Aug 26, 2015 at 05:10:34PM -0600, jd1008 wrote:
> On 08/26/2015 04:56 PM, fred roller wrote:
>> Set up the VOM and temp monitoring from software center. Push the
>> system and see if there is a corrilation with rise in temp and
>> your loss of power.
>>
>> Fred Roller
>>
> These are the only vom packages I see in the repositories:
> myproxy-voms.x86_64
> perl-VOMS-Lite.noarch
> perl-VOMS-Lite-tests.noarch
> perl-voms-server.noarch
> php-voms-admin.noarch
> voms.x86_64
> voms-api-java.noarch
> voms-api-java-javadoc.noarch
> voms-clients.x86_64
> voms-clients-cpp.x86_64
> voms-clients-java.noarch
> voms-devel.x86_64
> voms-doc.noarch
> voms-mysql-plugin.x86_64
> voms-server.x86_64
>
> Which ones are of the essence?
Perhaps I'm naive, but I assumed he meant an actual VoltOhmMeter...
Correction welcome, should I have been mistaken.
I am no electrician :)
Fred used the sentence:
VOM and temp monitoring from software center.
8:48 p.m.
My mistake, apologies. Set a physical VOM on the USB outlet. Get the temp
monitoring from repo. Lesson in clear response ;). Again, my apologies.
Fred Roller
On Aug 26, 2015 9:21 PM, "jd1008" <jd1008(a)gmail.com> wrote:
On 08/26/2015 07:14 PM, Fred Smith wrote:
> On Wed, Aug 26, 2015 at 05:10:34PM -0600, jd1008 wrote:
>
>> On 08/26/2015 04:56 PM, fred roller wrote:
>>
>>> Set up the VOM and temp monitoring from software center. Push the
>>> system and see if there is a corrilation with rise in temp and
>>> your loss of power.
>>>
>>> Fred Roller
>>>
>>> These are the only vom packages I see in the repositories:
>> myproxy-voms.x86_64
>> perl-VOMS-Lite.noarch
>> perl-VOMS-Lite-tests.noarch
>> perl-voms-server.noarch
>> php-voms-admin.noarch
>> voms.x86_64
>> voms-api-java.noarch
>> voms-api-java-javadoc.noarch
>> voms-clients.x86_64
>> voms-clients-cpp.x86_64
>> voms-clients-java.noarch
>> voms-devel.x86_64
>> voms-doc.noarch
>> voms-mysql-plugin.x86_64
>> voms-server.x86_64
>>
>> Which ones are of the essence?
>>
> Perhaps I'm naive, but I assumed he meant an actual VoltOhmMeter...
> Correction welcome, should I have been mistaken.
>
>
> I am no electrician :)
Fred used the sentence:
VOM and temp monitoring from software center.
--
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Have a question? Ask away: http://ask.fedoraproject.org
8:58 p.m.
On 08/26/2015 06:48 PM, fred roller wrote:
My mistake, apologies. Set a physical VOM on the USB outlet. Get the
temp monitoring from repo. Lesson in clear response ;). Again, my apologies.
I remember about ten years ago or so, I was doing tech support for a
small company. In my notes on one case, I used the term VOM because I
couldn't think of the more modern "multimeter." There was an
astonishing kerfuffle over it because nobody else at the company knew
what a VOM was and it didn't occur to any of them to ask me. Later, I
almost made the mistake of causing another fuss by using the term "pilot
light," but managed to dodge that bullet.
7:13 a.m.
On 08/26/15 20:58, Joe Zeff wrote:
On 08/26/2015 06:48 PM, fred roller wrote:
> My mistake, apologies. Set a physical VOM on the USB outlet. Get the
> temp monitoring from repo. Lesson in clear response ;). Again, my apologies.
I remember about ten years ago or so, I was doing tech support for a
small company. In my notes on one case, I used the term VOM because I
couldn't think of the more modern "multimeter." There was an
astonishing kerfuffle over it because nobody else at the company knew
what a VOM was and it didn't occur to any of them to ask me. Later, I
almost made the mistake of causing another fuss by using the term "pilot
light," but managed to dodge that bullet.
.
you should told them 'M' meant multimeter. to be more exact, dVOM,
"digital Volt Ohm Multimeter".
in early days VOM was actually Volt Ohm Milli-amp.
i have 2 meters that are multi meters.
1st measures ac/dc volts, ohms, milli-amps, diodes, conductance,
inductance, capacitance, ppm, and frequency.
2nd measures ac/dc volts, ohms, milli-amps, diodes, dwell, rpm.
--
peace out.
If Bill Gates got a dime for every time Windows crashes...
...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.
CentOS GNU/Linux 6.6
tc,hago.
g
.
11:54 a.m.
On 08/26/2015 06:14 PM, Fred Smith wrote:
On Wed, Aug 26, 2015 at 05:10:34PM -0600, jd1008 wrote:
>
> On 08/26/2015 04:56 PM, fred roller wrote:
>>
>> Set up the VOM and temp monitoring from software center. Push the
>> system and see if there is a corrilation with rise in temp and
>> your loss of power.
>>
>> Fred Roller
>>
>
> These are the only vom packages I see in the repositories:
> myproxy-voms.x86_64
> perl-VOMS-Lite.noarch
> perl-VOMS-Lite-tests.noarch
> perl-voms-server.noarch
> php-voms-admin.noarch
> voms.x86_64
> voms-api-java.noarch
> voms-api-java-javadoc.noarch
> voms-clients.x86_64
> voms-clients-cpp.x86_64
> voms-clients-java.noarch
> voms-devel.x86_64
> voms-doc.noarch
> voms-mysql-plugin.x86_64
> voms-server.x86_64
>
> Which ones are of the essence?
Perhaps I'm naive, but I assumed he meant an actual VoltOhmMeter...
Correction welcome, should I have been mistaken.
"VOM" back in the day meant "volt-ohm-milliammeter" (at least when I
was in electronic engineering). Granted, that was back when the earth
was still cooling.....
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks(a)alldigital.com -
- AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 -
- -
- The problem with being poor is that it takes up all of your time -
----------------------------------------------------------------------
2:19 p.m.
On 08/27/15 11:54, Rick Stevens wrote:
<<>>
"VOM" back in the day meant
"volt-ohm-milliammeter" (at least when I
was in electronic engineering). Granted, that was back when the earth
was still cooling.....
.
i remember those days well.
i still have my vom that i built as part of an RCA electronics course.
it still works and i still find use for it.
- The problem with being poor is that it takes up all of your time
-
.
words of truth.
--
peace out.
If Bill Gates got a dime for every time Windows crashes...
...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.
CentOS GNU/Linux 6.6
tc,hago.
g
.
2:25 p.m.
On 08/26/15 20:14, Fred Smith wrote:
<<>>
Perhaps I'm naive, but I assumed he meant an actual
VoltOhmMeter...
Correction welcome, should I have been mistaken.
.
well, i meant a real one, but i imagine a software vom could work.
that is if it does not use regulator the left ports are on.
i do wonder how/where the the analog to digital conversion is done.
--
peace out.
If Bill Gates got a dime for every time Windows crashes...
...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.
CentOS GNU/Linux 6.6
tc,hago.
g
.
6:59 a.m.
On 08/26/15 16:59, jd1008 wrote:
On 08/26/2015 12:08 PM, g wrote:
>
> On 08/26/15 11:17, jd1008 wrote:
>> On 08/25/2015 10:36 PM, g wrote:
<<<<>>>>
> ok, lets look at this another way...
>
> you say you are on ac, so that _might_ eliminate battery's voltage dropping,
> unless wall wart is failing, or failure in voltage regulatory circuits.
>
> ac input from wart is rectified in laptop and then feed to the various
> regulator circuits. it is possible that there may be a vlsi chip that
> does all the voltage regulating by feeding control voltages to output
> power transistors. voltage regulation can be done in many ways and only
> the oem knows for sure, unless supplied in specs or schematic.
>
> does laptop have indicator light to show battery/charge state, ac power
> state?
Power supply's ac-dc circuitry is external. It feeds DC to the laptop.
.
ok. ac/dc, does not matter. it is still good to know that wart is not
dropping voltage.
tho you should notice wart drop
> do you have battery state icon on a panel that you can watch?
Yes. It shows battery at 100%. I hardly every am without AC simply
because I only need the battery if and when AC goes out. In my area,
it doe shappen, albeit, not as often as it was happening elsewhere.
> if icon shows
> a state of 100% that later drops, that will give a clue of problem being
> in voltage regulator circuit or in usb port chip/s.
.
No. It stays 100%.
.
ok. that tends to indicate problem in voltage regulator circuit.
<<>>
> because you have failure on one side and not other, tends to
indicate that
> each side is on a separate regulator circuit. left side regulator could be
> heating up and failing.
That is a possibility, because the heat exhaust vent is next to the left
site ports.
.
fan blowing heat from cpu would not tend to be a problem. monitor exhaust
temp from start up to when usb ports drop power.
> which brings to mind, is this same laptop you inherited that had
over heated
> and you replace cpu, then found it to be gpu?
Nop. That laptop is fubar. it has the same behavior as before, even less
than one minute after powering on and booting.
.
it was probably due for the big gold recovery in the sky when i over heated.
<<>>
Well, I do not know. If it has internal regulators, they must be
receiving DC and regulating the DC voltage, due to the fact that the
AC->DC adapter is external to laptop.
.
it has them. wart supply has to be drop for the various ic's in system.
which are discrete transistors, various ic's, like ssi, msi and lsi, cpu,
gpu, ram, rom, usb.
plus, the screen could have several voltages for it. a lot of laptops feed
screen with 1 voltage and in the screen housing are regulators and hv
inverters.
being you gained experiance of opening up laptops, you might consider
doing so with this unit and check temps of the chips. mainly the usb
and the regulators. again, it could be regulator for left side usb and
could be cured with fresh heat compound.
--
peace out.
If Bill Gates got a dime for every time Windows crashes...
...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.
CentOS GNU/Linux 6.6
tc,hago.
g
.
3171
days inactive
3172
days old
15 comments
6 participants
participants (6)
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fred roller -
Fred Smith -
g -
JD -
Joe Zeff -
Rick Stevens