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" <jd1...@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 > 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 >
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