GSM Phone Maintenance and Repair Paper 2, WASSCE (SC), 2017

Question 3

a) State three disadvantages of using a charger of inappropriate voltage rating to charge a phone.

b)List three steps required to replace a bad charging IC of a cell phone.

Majority of the candidates answered question 3(a) correctly but could not list the steps as required by 3(b). Poor practical knowledge would have contributed to this.

Observation

The expected answers are:

a.Disadvantages of using inappropriate charger 

    - damage the phone battery        

    - damage the phone main board

    - damage the phone charging IC   

    - damage the phone charging port

    - shorten the life span of the phone battery

OR

Steps required in replacing bad charging IC

     - disassemble the phone casing;

     - desolder  IC and remove it completely;

     - replace IC with new one of the same capacity and minding its orientation;

     - solder the legs of the IC;

     - assemble the phone.