laptop won't power on...

[Rodel]

hp pavillion dv5000
1 gb ram
120 gb sata hard drive
intel processor

a laptop was brought to me last week, the client said the laptop suddenly shutsdown itself after a few minutes of turning it on. i check the hard disk,ram and it's ok. I could not use the battery because I think it is drain because when i try to plug in the adapter because the led won't turn on(lights on)... the question is, do you think that their is a possibility that the motherboard is defective...? thanks and god bless....

 

[vontreigo]

check cpu?

over heat burn the chip?

 

[NickCat11]

Are you sure the ac adaptor is getting power to the tip?

 

[Rodel]

the cpu is ok...not sure bout the tip...but i tried to test if it has power the tester give me a positive result(continuity)... we, send it to a bigger computer shop, the technician said the motherboard is defective...is there any other possible causes which this laptop would not power on aside from the motherboard and the adapter? because the shops options are defective motherboard and defective adapter... do you think there are only two options in which this laptop won't power up? thanks & God bless...

 

[NickCat11]

Well you've said the rest of the hardware is ok so that just leaves the mobo and the adaptor right?

 

[Rodel]

yes...so only the two parts are the possible cause of the laptops defectivity...? thanks again...God bless...

 

[atlanticjim]

Check the USB ports.

I really dont know if this applies but I had a desktop that I was wrestling with last week that would not boot. . would not post! Actually a Dell with a "BYLOD" (blinking yellow light of death) after all the standard procedures to discover the problem, I disconnected the front panel controls and heard it try to boot (without posting). Looked more carefully and found a borked USB port on the front panel board that was shorting itself. Bent back the pins to a neutral position, covered it over so it could not be "violated" again and viola. . fully functional. Of course this is now in my work flow.

 

[Rodel]

i will also try to check...thanks again...

 

[jackz]

long shot but it could be the power button, I'v read here from another user that the best way to test the power switch is to take the button off and use a needle nose pliers or something to make the contacts.

 

[Rodel]

switch has no problem...but i will try to check...thanks...

 

[pcstu]

I've had this problem before and had to clean the dust out of the fan to the cpu. Ended up having to take the laptop apart and clean out a huge hunk of dust that was blocking air flow. Laptop went fine after that.

 

[PcTestCard.com]

Check if the AC adapter LED is on when connecting to the main.

I would say the mainboard power card /management module could be faulty.

Hope this helps!
Bill

 

[Rodel]

mainboard power cord or card?

 

[LunchBox]

The LED turning on on the ac adapter does not mean it is actually providing the correct voltage/current. You need to use a volt meeting to find out how much then checking on the label of the ac adapter how much it should be.

Do you have a different adapter you can try?
Have you tried turning it on with ac adapter plugged in and the battery removed?
Have you tired turning it on with battery inserted ac adapter removed?

Of course it can still be the mobo or ac adapter

 

[Rodel]

yes, i have already tried to switch on the laptop with it's ac adapter plug in without the battery and with the battery attach to the laptop...but still it won't turn on...there was no light on the led...i was not able to try it with an identical adapter because we don't have one...and if use another adapter with lesser or greater supply it may gave more damage to the laptop....am i right?... pls help....

 

[bagellad]

Didn't you already say you sent it to another tech and they said it was the motherboard? Can't you just ask them how they came to this conclusion?

Also.. get one of those multi laptop adapters.. don't just stick in a random adapter lol.

 

[LunchBox]

Didn't you already say you sent it to another tech and they said it was the motherboard? Can't you just ask them how they came to this conclusion?

Good one, asking how they go to that conclusion is a great question. I've dealt with clients that were given a its the motherboard but ended up being the power supply (it was a destkop). The tech lack of skill pointed the troubleshooting to the mobo.

So ask what makes them think its the mobo. It could very well be but it will also help you know how they came to that conclusion then later on you can apply the same to your future troubleshooting

 

[usacvlr]

I'm assuming you have a digital meter not an analog here.

Set your meter on dc volts. Stick one probe into the end of the barrel connector if it's a normal barrel connector and touch the other probe to the outside of the barrel. You should get 18.5 volts.

If you do get voltage then the jack in the laptop may be bad.
Take your meter and set it in the ohms position.

Measure between the center pin of the jack inside the computer and any metal surface on the outside of the computer. You should get something up to no higher than 300k. If you get an infinite value or several megohms then the jack connection to the board is either open or the fuse on the board is bad or the first regulator is shot.

If you did get 300k or less then there are serious problems on the board and it's not worth repairing even if you find something who will do it. I don't even bother to repair 99.9 % of them. The time invested is about the same as what I would charge for a replacement board which on most models is between 150 and 250