7/27/2019 Charging Faults1.docx

1/1

Charging Faultscharging faults are mainly of three types

No charging Not charging

Auto charging

No charging:inthis fault a mobile phone does not charge at all when charging pin is

inserted nothing happens it is always due to damaged fuse. or broken

charging supply track if we repair fuse or jumper broken tracks we canset this fault off.

but on the first step I am telling you how to check no charging fault.

Check Your battery if it is not connected properly no charging fault occurs. check continuity between charging pins it should be nor full nor high resistance.

if it is showing full continuity then there may be some problem in your

charging IC may it is totally short you can re hot /replace this IC.

if there is no continuity in charging pins 90% fuse is damaged. you can

replace fuse or jumper it. if a fuse shows full continuity in multi

meter then it is working correctly if it is not so it is damaged. if fuse is not damaged you can check tracks if broken.

if fuse, battery and tracks are ok then charging IC would be damaged.

Not charging:in

this fault a mobile phone shows a message "Not charging" on the screen

when ever it is connected with charging pins. this type of fault is nota mere hardware fault it is 90% software fault. this fault is present

only in nokia and I personally experienced a problem with a nokia 3100

it was showing "Not charging" i tried hardware solutions but totally in

vain so I upgraded my software now every thing was ok. . and this is

the same case in many types of nokia brands you can check this up.Only

nokia 1100 when "Not charging" fault comes it is very hard to removethis fault in nokia 1100 I only repaired a little number of nokia 1100

displaying this message there was a problem in charge connector diode

next to charging fuse. but often it can be solved by repairing software

or upgrading it.

Auto Charging:In auto charging a phone continues showing charging despite of removing charging pin from

phone.

in this type of fault the "BSI" pin of mobile phone is very important

because it is used to tell the phone what is the state of mobile phone

charging now so if this pin is not ok this fault occurs. there

are some cases in wich a mobile phone battery is ok but auto charging

is present you can check transistors if used in charging section and iffaulty replace it because this transistor is used in some mobilephones

to cut off charging from phone automatically. in

In some cases aresistance in charging section is responsible for that which is markedas "R22" in charging section so you can check "+" supply connection

with this