Charger works good, outputs 19.1 volts and the voltage gets to the circuit board inside the computer. the constant current regulator inside the computer does not output 10.8 volts. Laptop works good from battery but the computer cannot charge the battery when its installed. Need diagram of regulator circuitry and some explanations?
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Ok, lets start slowly, do you have both a new battery and a new battery charger? If both attempt to use your old battery with the new charger. Also could be a bad charger or a shorted out battery... Good Luck
Depending on what type of plug it is you may be able to change the fuse. If the fuse has blown then you really need to know why before plugging it back in to the mains. The charger may have a broken wire in the lead that plugs in to the laptop. Usually it happens right near the plug where it gets bent and twisted. It could also be the internal fuse inside the charger box.
If you can't get it tested properly then a new one is your best bet. They are quite cheap on Ebay. Just look for the one for your make and model number and check to make sure the voltage on your chargers label is the same, it's output voltage is probably 19 volts. The voltage must be the same, NOT lower or higher. Then have a look at the label for the current which is in Amps, something like 3.15Amps. You can buy one with higher current than the one you have but NOT lower than the label says.
If the laptop will not physically turn on (as in no led's), check the following in order: Also check the RAM is seated correctly, remove the hard drive and test without it being in the laptop
Check the charger led is steady, a flashing led points to power not making a circuit and being "spat back".
If the charger LED is steady check then the power outputting from the charger with a multimeter, set to 19 volts DC, red probe to the inner of the jack, black probe to the outer, a drop in voltage indicates a charger not properly working.
If the above are ok, check the security of the charger port, if this feels sloppy or loose, it will need replacing as it is not pulling power to the board (on this model I THINK there is a wired port..not a hard soldered port, you may find that if it is the former, the wire has developed a short and you may need to replace it.
If the above are ok and either the charger led is flashing or power is not making it to the board, check for a small ceramic fuse near the charger port on the motherboard, put a multimeter across both sides with the meter sets to Ohms and see if current is making it across the fuse, if it is not, it required repairing or bridging.
After that, you have a fault on the motherboard in the power circuit and will need to consider replacing the motherboard
Possible troubleshooting steps and repair solution:
First of all, test the power adapter. Make sure the adapter outputs correct voltage. It's possible that the output voltage is not correct and the laptop shuts down to prevent the damage. Test your laptop with another known good power adapter.
If the problem still exists, even after replacing the adapter, most likely it's the motherboard failure. Replace the motherboard.
Check if the charger has voltage which is 19 volts typically. If it does the charger is good. So that means the problem is in the laptop. Many times where you plug it in gets bad solder connection or the connector inside gets worn from plugging it in and out improperly. They should be plugged in straight and carefully. Then pulled out straight as well to prevent damage.
Elaborate a little more on why you don't think it is the charger? Did you test the voltage at the tip or did you test the charger on another HP device that needs 19 volts to run properly? Just remember a laptop can run with less wattage but not less voltage. I will tell you though that DV4000's are known to have power jack issues and that the jack is soldered directly onto the motherboard. They are not easy to replace because of the amount of "legs" they use to attach to the motherboard. Because of this there are issues with broken solder points on one or more of the legs. Sometimes these can be resoldered instead of having to try and remove the jack. Just heat up the solder and let it flow back over the joint and hopefully that make contact. The other issue with their jack is the solder point at the center pin breaks and the tension band inside the housing tends to lose its tension and will no longer hold the charger plug in place. Last but not least, the power circuit on the motherboard itself has been unreliable at best, if that fails, just replace the motherboard. Good luck to you.
The power comes into the plug on the back of the computer. This connects it to metal traces inside the mainboard of the computer. These will be connected to voltage regulators which often output 5 volts, 12 volts, 3.3 volts, and the CPU voltage; they sometimes look like the image at right.
These will be connected to cylindrical capacitors distributed throughout the mainboard. Capacitors act like tiny, fast batteries, supplying extra power where needed to maintain a steady voltage during high demand.
Anywhere in your laptop, physical or electrical damage can cause a short circuit. A short circuit will consume all available power, causing your laptop to not turn on. If your power adapter LED comes on when you plug it into the wall, but then goes off when you plug in the laptop, you probably have a short circuit.