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?
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.
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???
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.
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.
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@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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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@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. -- users mailing list users@lists.fedoraproject.org <mailto:users@lists.fedoraproject.org> To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
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.
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.
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@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.
-- users mailing list users@lists.fedoraproject.org To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
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.
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.
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.
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@alldigital.com - - AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 - - - - The problem with being poor is that it takes up all of your time - ----------------------------------------------------------------------
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.
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.
-
fred roller -
Fred Smith -
g -
JD -
Joe Zeff -
Rick Stevens