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@xxxxxxxxx
<mailto:jd1008@xxxxxxxxx>> 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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