LAPTOP REPAIR

HP CQ40 Battery Charging Discription    HP CQ40 Charging Description Laptop battery is charged by external power. Which is uselly output dc voltage and provide power to system and charge battery simultaneously. When battery fully charged continoue supply to system through adaptor and cut battery charging .Every laptop has his own type of configured charging circuit. Charging process is manage by multi controllers like: • Charging ic • KBC I/O controller (for battery temperature, level, enable and adaptor detection) • Battery internal rom chip or external rom u28 (battery must be connected) First of all system supply B+(main supply source) is available for system startup Note: for more on B+ Supply Read Article  http://www.laptoprefix.com/viewforum.php?f=13 Read more...

HP CQ40 Main Power Supply B+ Description Hp CQ40 Supply With Hp Adaptor Introduction Cq40 is commonly use and very often find laptop and its circuit is very basic similarities with other hp models. So I explained it Charging section First. it is charging with hp’s 3 pin adaptor architecture. It is very often in others companies like dell, lenovo etc. it protect system with external over voltage and surge. When there is damage in circuit it stop output from adaptor. ID signal is use to operate charging Enable function. Read more...