strange behavior of external esatausb ports on a Dell laptop

[fred roller]

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 at 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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