The power jack socket is located inside the laptop computer & conducts power from it to the electronics of the laptop computer to charge the battery & power the laptop computer. When a fault develops it is often difficult to be sure of the cause, this article will indicate some of the things to check to arrive at a conclusion.
You may notice any of the following that may be caused by a defective power jack located inside the laptop computer:-
1. Laptop computer dead no power lights etc. This can be caused by no power getting to the laptop computer or very any other fault affecting the power up sequence of the laptop computer. In case you have another laptop computer of the same model & make you could try swapping the battery with a fully charged battery. If the laptop computer then powers up then the fault is probably with the power jack or charger. Alternatively, sometimes gently wiggling it will cause the charge lights etc. of the laptop computer to briefly illuminate. This would again indicate a failed power jack.
2. Laptop computer comes on then cuts out after a short period. Again several faults could cause the laptop computer to quickly cut out; however, a defective power jack would often cause this. When the power jack contact make a poor electrical connection, heat is often generated causing the connection to terminate.
3. Laptop computer comes on but battery won't charge. Often when the power jack fails this is caused by or more solder pads cracking; this may finish up in a high resistance electrical path. This will in effect limit the maximum current that can be delivered to the laptop computer, so the laptop computer may come on but there is not power left to charge the battery.
4. Laptop computer works until or unless the power connector is wiggled. Very much like the last fault except the solder pads make & break connection when it is wriggled.
5. Battery charges when laptop computer is turned off, but not when it is turned on. This is very much like fault three as not electrical power can be delivered to both the laptop computer & battery.
6. Smell of burning or hot power connector when plug removed from the laptop computer. When or more solder pads connected between the power jack motherboard fracture a high resistance electrical contact may be produced. When current flows heat will be generated possibly leading to part or motherboard burning. This is perhaps the most destructive failure as it often destroys the motherboard due to the considerable heat generated. The repair will either be impossible or corrected by using a netted power connector that makes use of flying leads to bypass the burnt motherboard.
7. Light on laptop computer power supply dim or flashing when connected to laptop computer & normal when not connected. Most laptop computer power supplies have a safety feature where they will dim or flash the power light to indicate that there is an overload condition inside the laptop computer. This will often occur when the laptop computer motherboard is beginning to smolder as the motherboard, which ought to be an insulator, turns in to a conductor due to carbon production.
8. Sometimes it is apparent when the power jack becomes detached inside the laptop computer.
Repair of the power jack ought to only be carried out by a competent laptop computer repair company as it is very simple to destroy the motherboard & laptop computer if great care is taken when removing & re-soldering the new connector.
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