The notebook computer hp compaq udqfrzr01c1n laptop cpu fan power adapter are all sealed small volume design, and the consumption of power can generally be up to 35 w to 90 w, so the internal temperature is higher, especially in hot summer, touch the power adapter will have a hot feeling. Because of this, power adapter failure rate relative notebook computer other parts is relatively high. Power adapter damage, buy a new spend hundreds of yuan, to the secondary market tao also needs the multivariate. In fact, many power adapter damage is not serious, slightly understand some circuit knowledge user can try to repair
 
Ready to electric knife, a hammer, screwdriver, electric iron, pen knife, etc.
 
The notebook computer power adapter and cover for injection molding packaging or with strong adhesive joint, need not any screw, so general can only resort to violence to crack. However,hp compaq cq42-100 laptop cpu fan as long as the method is proper, after disassembling the power adapter can bounce back, don't watch carefully almost can not see a trace of apart.
 
The power adapter lateral side placed on white paper, with electric knife edge along the power adapter and cover the gaps between the cut, and then use a hammer percussion electric knife knife back (as shown in figure 1), make electric knife from adapter between up and down cover cut in. In the adapter and cover the gaps between the different position, with electric knife point along the hp compaq cq42-200 laptop cpu fan gap paddling, when fluctuation cover some place first crack, the blade deeply, then slowly separate adapter and cover.
 
Then open the enclosure of the power adapter, you can see adapter circuit external bread has a copper shielding layer, use pen knife cut open shielding layer on the tape paper, reoccupy solder iron welding open shielding layer and internal circuit board connecting two solder joints (see chart), namely under wired shielding layer.
 
Shielding hp compaq cq56-112 laptop cpu fan layer and circuit board still between every one layer is thick hard plastic film (as shown in figure 4), and then on the edge with art design knife cut open, can see circuit board "looks like"
 
1. Pressure sensitive resistance, its function is when external voltage is high, the pressure sensitive resistance value quickly become small, and pressure sensitive resistance tandem fuse was blown fuse, in order to protect other circuit will not be burnt out.
2. Fuse, the specification is 2.5 A / 250 v, when the current in the circuit is too high, the fuse will fuse to protect other element.
3. Inductance coil (also called reactor), the main function is to reduce electromagnetic interference.
4. Rectifier bridge, specifications for D3SB, the function is the 220 v alternating current (ac) to direct current.
5. Filter capacitance, specifications for 180 u F / 400 v, the function is filter in the dc ac ripple, make the circuit work more reliable.
6. Op-amp IC (integrated circuit), the protection of circuit, voltage regulation is an important part of.
7. Temperature probe, for detection of power adapter internal temperature, hp compaq cq56-115 laptop cpu fan when the temperature is higher than a set value (different brand power adapter, the set temperature valve value slightly different), to protect the circuit will cut off adapter voltage output, in order to protect adapter from being damaged.
8. High power switch tube, is the core element of switch power supply, switching power supply can "opening and closing" work, responsible for the switch tube.
9. Switch transformer, switch power supply of one of the core elements.
Secondary rectifier tube, the function is the low voltage ac into low voltage dc. In the IBM power adapter, rectifier often is made up of two large power parallel work, to get bigger current output.
11. The secondary filter capacitance, specifications for hp compaq g42-300 laptop cpu fan 820 u F / 25 v, a total of two, the filtering low voltage dc in the role of the ripple.
In addition to the above element outside, circuit boards and adjustable potentiometer and other resistance capacity element.