I recognise that this is a common issue with the Compaq R3000 laptop. The powerchord works fine but has a habit of 'slipping' out when charging the battery. I keep have to pull it out and put it back in, twist it a bit, and then it may be fine for either 2 seconds or 5 minutes depending how well I get it back in. The end result is an ever decreasing battery life and a laptop that is persistantly frsutrating to use.
I am not techno savvy, to open up the notebook and solder bits back to the motherboard and all that, as has been recommended elsewhere. Is there anywhere I can bring this computer to and have someone fix this ?
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I would recommend since you had the hardware in the laptop checked and the powerchord was replaced that you try charging the device in a different wall socket as the problem my lie there. However it is more likely that your DC input receiver that you plug the chord into on the laptop is defective and this is not an issue with your motherboard, it is a seperate connector that charges the internal battery. It could be also that whoever is using the powerchord is continually straining the wires by twisting them, or stretching them in awkward directions unintenionally. You want to be sure that there is always some slack in cable when it is connected, and that it is wrapped up correctly (ie dont just tangle all the wires up and throw it in a bag when it is not in use).
most case cause DC jack connection is not stable or damage
you may try
1) to open cover find out the DC jack 2 or 3 pins on the motherboard then to fix it use iron and flux.
2) check any disconnection DC/DC circuite near the jack
3) repleace the new jack if the jack damage
Hve u tried a differnt adaptor , the adaptor might be blown too ,try replacing the adaptor , also check for the power cord if it has any kinks in it which may be interrupting the power supply , since the adaptor 18.5 v 3.5 a is the most common of all hp adaptors u should find one to try .
it might as well be a internal problem related to power or loose contacts with RAM or the power chords internally.
Better to go to the technician in this case.
Your first Battery would have been fine too..
Remove the battery and plug in the power adapter. Attempt to power on the laptop. If nothing happens, then try holding the power cord, at the jack, at a different angle. Wiggle it a little and see if the laptop will come on. If it does come on, then wiggle it some more and see if the laptop cuts off.
This will determine if your DC Jack is faulty. I have resoldered a bunch of these on this model. Usually the solder around the HOT pin on the mainboard cracks. Thus, you don't get a good power connection.
Now, as far as the laptop coming on with the battery.... how long will it run on just the battery? A couple seconds? Or a couple minutes? Or until you turn it off? If the battery were about dead, then it would come on for just a couple seconds but not POST. Meaning no video or anything. But if it comes on and runs for several minutes without turning off, then a weak battery isn't the problem. It should still POST and show video and all that.
So, even if you get the DC Jack fixed, assuming its faulty, this may or may not solve your POST problem. Never know really until the dc jack is for sure supplying good steady power.
Those may have 1 or 2 different problems.
Cold Solder joint on Mobo.
Bad DC Power Jack.
1: if it is the Cold Solder, you can reflow the solder and be done with it.
2: if it is the DC power jack, It should be replaced.
For simplicity lets call them DC(A) and DC(B)
There are 3 connections to it. Gnd, DC (A), and DC (B).
When the powersupply is plugged in, contacts (A) touch to send +DC to the laptop. (B) is open.
When the laptop is using battery power, contacts (B) touch to send power from the battery through the system.
Over a period of time (inserting and removing the DC Power Cord), the contacts become fatigued, or oxidized and the DC(B) never closes - so it won't work from DC Battery.
RATE ME - if it helps