Question 9
- A flip phone user discovered that the screen of his phone has turned white. State three possible causes of this observation.
- 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