HP dv1000 not responding

[spaceman]

Well, I was given a broken dv1000 (I'll update the exact model later) that has a working power adapter, but shows no signs of being plugged in or charging and won't power up at all.

I've found a few support threads and the best theory seems to be that the lines on the motherboard can become cracked due to bad HP engineering when opening/closing the laptop.

However, I would like few more opinions on this. I've attached some pictures, but if someone wants a closer image of an area, I've still got it open.

Also, please ask any clarifying questions. I've tried so many angles with this thing that I honestly can't remember specifics anymore.

[shovenose]

Re: HP dv1000 not responding

is this a p4 with nvidia?

[Wrog]

Re: HP dv1000 not responding

I'm assuming you've already checked the simple stuff, like broken DC jack and shorted power? Does it run on batteries (if you have a charged one that fits)?

[spaceman]

Re: HP dv1000 not responding

is this a p4 with nvidia?

I believe that it is a celeron M and I'll have to check on the graphics when I get home. Honestly, I didn't expect any replies this quickly. Thank you, I'm a little taken off guard by the fast replies.

And unfortunately I don't have a charged battery and it doesn't look like anything is broken, but as I said before, keep the questions coming and I'll double check once it's in my hands.

[shovenose]

Re: HP dv1000 not responding

basically im just curious what the specs are. because p4 cpus run hot and nvidia gfx chips in laptops are known to overheat and partially unsolder themsleves from the motherboar.

[spaceman]

Re: HP dv1000 not responding

Wow, I'm always amazed at how short the edit time is here.

Well, either way, the actual model is dv1610us and the graphics chip is an intel GMA 900 (yikes, I didn't realize it was that low-my netbook can handle more )

Full system specs

And I double checked the power plug and everything indeed seems intact. I still can't find any physical evidence of something being broken, but then again I can't see the tiny things.

[retiredcaps]

Re: HP dv1000 not responding

Wow, I'm always amazed at how short the edit time is here.

It was raised to 2 hours just yesterday.

[Wrog]

Re: HP dv1000 not responding

And I double checked the power plug and everything indeed seems intact. I still can't find any physical evidence of something being broken, but then again I can't see the tiny things.

Can you post a macro shot of the DC jack area (bottom side where the pins are located)?

[mockingbird]

Re: HP dv1000 not responding

basically im just curious what the specs are. because p4 cpus run hot and nvidia gfx chips in laptops are known to overheat and partially unsolder themsleves from the motherboar.

Not in this case. The only nVidia chips that were bundled with the Centrino were FX series and below which did not posses any inherent defects, so this is not the problem.

[spaceman]

Re: HP dv1000 not responding

Can you post a macro shot of the DC jack area (bottom side where the pins are located)?

Will these do?

[xaviero1412]

Re: HP dv1000 not responding

just a trial ....

try re-solder this part (attacment)
and re-measure that part again...

[PowerIC]

Re: HP dv1000 not responding

Please Check for Short Circuit on PC151 , PC55 and PQ44

PC151 and PC55 Near ODD Connector

PQ44 Near DC Jack


If They are in Short try to replace them.

Good Luck

[Lagunapete]

Re: HP dv1000 not responding

I believe dv series is late enough to have an on board fuse. It's a tiny mother and looks like the size of an on board resistor except for the fact that it is (usually) cylindrical.
A common open for these units. You can bet it will happen if the wrong PS is applied. It's located just before the first diode, inbound. not enough magnification. macro mag needed to determine exact area. ( sorry, me eyes aren't as good as they once were LOL)

[Lagunapete]

Re: HP dv1000 not responding

After looking a bit harder, I think I see that little guy. He's right behind the power jack. If it's just a tiny bit larger than a resistor but has no markings except maybe a 6A on it and it is cylindrical. That's your dude to check out. Ones I have usually seen are 6 amps. Could be +/- a few though. What's a dv at? 19 or 19.5? something like that. Let us know if that's the culprit please.

[Terry Dactil]

Re: HP dv1000 not responding

I was also given a dead dv1000 and was staring at a circuit board which had no visible faults and wondering what to do next.

When I applied power in the hope that I could check some voltage readings to verify that at least the power supply was working I noticed tiny sparks on C150 near the input socket.

That seemed like a good place to start, so I removed it and found that the various blue LEDs would now flash briefly when the power button was pressed. At least there were some signs of life now.

There were no markings on the little smd capacitor (and I only knew it was a capacitor because of the screen printed label on the board), so I decided on the "brute force and ignorance" method of troubleshooting. I got the smallest tantalum capacitor I had handy and soldered it to the now vacant smd pads.

Voila! Pressing the power button now brought everything to life and it has worked ever since.

I have no idea what value the original capacitor was, but as the substitute (2uF) fixed the problem I have left it as is.

[raizenn27]

Re: HP dv1000 not responding

i have the same model and the same problem,but i already try all suggestions here..,but still not working...,anyone help?

[Terry Dactil]

Re: HP dv1000 not responding

OK. I found the value of C150. The circuit diagram shows it to be 1uF.
However, my 2uF replacement is still working fine.