[JonnyAlpha]

Hi;

I have been asked to help fix a dead HP Pavllion DV4000.

The Laptop is completely dead, with the power cord disconnected when you switch on the mains the green LED on the PSU DC connector lights up bright green, but when you connect it to the Laptop the LED fades and goes out, this is the same with or without the battery connected.

With a multimeter the power output from the PSU DC jack reads 31v (which is the output stated on the PSU). However as soon as you plug it into the DC socket on the Laptop the LED goes out and the reading (if your quick) is <5v to 0v. Its as if plugging it into the Laptop is causing the PSU to cut out??

WIth the battery connected and the mains power on pressing the power butting on the Laptop does nothing.

Any ideas on how to identify what's wrong?

Thanks

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WIth the battery connected and the mains power on pressing the power butting on the Laptop does nothing.

What immedaitely springs to my mind, is, do we know that battery is good.

Secondly it sounds as though the power supply, may be OK, when not under LOAD, but then as soon as a demand is made, it fails.
I think your first course of action is to try a good known power supply.
OR if possible charge the battery and try a good known battery.
That all said of course it may NOT be the Power supply, it could be inside the laptop.

Basicaly you are going no further I think until you try one of these suggestions

[Macboatmaster]

WIth the battery connected and the mains power on pressing the power butting on the Laptop does nothing.

What immedaitely springs to my mind, is, do we know that battery is good.

Secondly it sounds as though the power supply, may be OK, when not under LOAD, but then as soon as a demand is made, it fails.
I think your first course of action is to try a good known power supply.
OR if possible charge the battery and try a good known battery.
That all said of course it may NOT be the Power supply, it could be inside the laptop.

Basicaly you are going no further I think until you try one of these suggestions