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

Question 9

 

  1. A flip phone user discovered that the screen of his phone has turned white. State three possible causes of this observation.
  2. List three ICs found on a mobile phone PCB.

The questions here tested Candidates’ knowledge of fault finding and IC’s found on a mobile phone PCB most of the candidates did respond to the question correctly.

 

Observation

The expected answers are:

         (a) Possible causes of phone screen turning white

  • Damaged flex
  • Partial contact of flex
  • Faulty screen
  • Partial contact of the screen
  • Damaged display IC
  • Faulty connector
  • Dirt accumulation on flex terminal                

       (b) ICs found on a phone PCB

  • Network / RF / Hargar IC
  • Power IC
  • CPU
  • Flash IC
  • Logic / UI IC
  • Charging IC
Audio IC