HP Pavillion zv5000 Power issue
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Posted by apyankeefan on July 1, 2008, 1:42 pm
Please log in for more thread options I have an HP Pavillion zv5000 notebook computer. It's been fine for a while, but now it won't turn on. I've done some research and I have found that it may be the power jack that needs to be replaced? What happens is that when I plug it in, the power light on the front just blinks. When I go to press the power button the power light comes on for about a second and then goes off. Therefore it won't power up. Just wondering if anyone could shead some light on this issue. Let me know, and all help is greatly appreciated! Thanks, Allen | |||||||||||||
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Posted by Paul on July 1, 2008, 3:22 pm
Please log in for more thread options The blinking could be because the adapter has detected an overload condition. The adapter itself could be defective. Or the laptop may be drawing more current than it is supposed to. ******* If it was my laptop (because I own test equipment) I would 1) Cut adapter cable, in order to make a DC current flow measurement. Plug in adapter. Set digital multimeter to detect peak current flow. If the peak current flow exceeds adapter rating, then the laptop is overloading the adapter. A multimeter with peak detection is required, because the adapter will shut off in 35 to 50 milliseconds, before a conventional measurement can be completed. 2) Do a load test on the adapter. (Connect the adapter to a load resistor, and not to the laptop at all.) If the adapter was rated at 19V and 3A, I would use a 6.33 ohm resistor. The resistor would need a power rating of I*I*R or V*V/R or 57 watts. The resistor will get very hot, so I would blow a fan over it, or connect a heatsink to the resistor. It requires some knowledge of Ohms law, how to put resistors in series or parallel, to get the desired value. I would also try a couple different values of loading, like a bit less than full load, to see if the adapter can work at all. If the adapter goes off, then it has detected an overload. It should only overload, if an actual overload was present (i.e. draw more than the 3 amps in my example). Example of adjustable resistor. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=D50K10R-ND http://www.ohmite.com/catalog/pdf/210_series.pdf A fixed resistor that bolts to a heatsink. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=RHD-10-ND ******* Generally, a power jack failure leads to no power flow. The adapter should not overload, and if there is a LED on the adapter, it should remain lit and not blink. On the other hand, if the power jack is still good, the blinking of the adapter is because it has detected an overload. If the adapter is not plugged into the laptop, and the LED stays on, then you know that the blinking behavior is load related. The overload could be present, because in fact, the power jack is still making good connections, and the overload is inside the laptop. Based on the information you have provided so far, I think the plug and jack are OK. Examine the cord of the adapter, near where the barrel connector is attached on the end. Look for broken or frayed wires, as they could be what is causing the adapter to blink. Sometimes, the wear and tear on wire and connector, causes a short, and the frayed wire could be inside the plug assembly on the end of the cable. If the adapter is OK, and capable of delivering full load, then something inside the laptop may be responsible for the overload. The question is, will you pay $200.00 for someone to "look at it" ? That is the joy of owning a laptop. If I had a reference schematic for a laptop, I'd be able to make more suggestions, but to date, I've never had access to a schematic. I'd like to understand how the input circuitry is set up, to make it easier to predict what can happen. Like whether a dead battery could cause the symptoms. Paul | |||||||||||||
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Posted by kony on July 1, 2008, 7:06 pm
Please log in for more thread options wrote:
>apyankeefan wrote:
>> Hey everyone.
>> >> I have an HP Pavillion zv5000 notebook computer. It's been fine for a >> while, but now it won't turn on. I've done some research and I have >> found that it may be the power jack that needs to be replaced? What >> happens is that when I plug it in, the power light on the front just >> blinks. When I go to press the power button the power light comes on >> for about a second and then goes off. Therefore it won't power up. >> Just wondering if anyone could shead some light on this issue. Let me >> know, and all help is greatly appreciated! >> >> Thanks, >> Allen >
>The blinking could be because the adapter has detected an overload >condition. The adapter itself could be defective. Or the laptop >may be drawing more current than it is supposed to. > >******* >If it was my laptop (because I own test equipment) I would > >1) Cut adapter cable, in order to make a DC current flow > measurement. Plug in adapter. Set digital multimeter to > detect peak current flow. If the peak current flow exceeds > adapter rating, then the laptop is overloading the adapter. > A multimeter with peak detection is required, because the > adapter will shut off in 35 to 50 milliseconds, before a > conventional measurement can be completed. Rather than cutting the cable, it might be more desirable to open the power brick case, desolder the wire from the PCB so the meter is between PCB trace and end of wire... that way the wire can be resoldered when the measurement is finished without having to repair the cable, plus if the AC-DC brick has burnt marks or popped capacitors inside then opening it may reveal such problems. Also with it open one can more directly measure the output voltage while it's powering the laptop. Main issue is of course that one must exercise caution since the open ac-dc brick potentially exposes the technician to live AC mains voltage. | |||||||||||||
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Posted by apyankeefan on July 2, 2008, 11:29 am
Please log in for more thread options > wrote:
> > > > > > >apyankeefan wrote:
> >> Hey everyone.
>
> >> I have an HP Pavillion zv5000 notebook computer. It's been fine for a
> >> while, but now it won't turn on. I've done some research and I have > >> found that it may be the power jack that needs to be replaced? What > >> happens is that when I plug it in, the power light on the front just > >> blinks. When I go to press the power button the power light comes on > >> for about a second and then goes off. Therefore it won't power up. > >> Just wondering if anyone could shead some light on this issue. Let me > >> know, and all help is greatly appreciated! >
> >> Thanks,
> >> Allen >
> >The blinking could be because the adapter has detected an overload
> >condition. The adapter itself could be defective. Or the laptop > >may be drawing more current than it is supposed to. >
> >*******
> >If it was my laptop (because I own test equipment) I would >
> >1) Cut adapter cable, in order to make a DC current flow
> > =A0 =A0measurement. Plug in adapter. Set digital multimeter to > > =A0 =A0detect peak current flow. If the peak current flow exceeds > > =A0 =A0adapter rating, then the laptop is overloading the adapter. > > =A0 =A0A multimeter with peak detection is required, because the > > =A0 =A0adapter will shut off in 35 to 50 milliseconds, before a > > =A0 =A0conventional measurement can be completed. >
> Rather than cutting the cable, it might be more desirable to > open the power brick case, desolder the wire from the PCB so > the meter is between PCB trace and end of wire... that way > the wire can be resoldered when the measurement is finished > without having to repair the cable, plus if the AC-DC brick > has burnt marks or popped capacitors inside then opening it > may reveal such problems. =A0Also with it open one can more > directly measure the output voltage while it's powering the > laptop. =A0Main issue is of course that one must exercise > caution since the open ac-dc brick potentially exposes the > technician to live AC mains voltage.- Hide quoted text - > > - Show quoted text - I'll try this in a bit and let you guys know how it works out. Thanks for all of the info! | |||||||||||||
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>
> I have an HP Pavillion zv5000 notebook computer. It's been fine for a
> while, but now it won't turn on. I've done some research and I have
> found that it may be the power jack that needs to be replaced? What
> happens is that when I plug it in, the power light on the front just
> blinks. When I go to press the power button the power light comes on
> for about a second and then goes off. Therefore it won't power up.
> Just wondering if anyone could shead some light on this issue. Let me
> know, and all help is greatly appreciated!
>
> Thanks,
> Allen