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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