Touch screen problems and solutions

Screen Touch: Type of component that helps to operate a mobile phone by
touching the screen. Touch Screen is available in different sizes. It normally has 4
Points Namely: - (+), (-), (RX), (TX). Screen Touch is also called PDA. It is
controlled by the CPU. In some Mobile Phones there is an Interface IC called PDA
IC or Screen Touch IC.
 

Faults:

1. Screen Touch not Working.
2. Only Half Screen Touch Works.
3. One key is pressed and some other key works.


Solution:


1. Check Settings if the Mobile Phone has Both Keypad and Touch Screen.
2. Clean and Resold PDA Tips and PDA Connector.
3. Change PDA.
4. Check Track of the PDA Section and Jumper if Required.
5. PDA IC: Heat or Change.
6. CPU: Heat, Reball or Change.


Note:

If the PDA Problem is not solved by Hardware Then Reload Software to Solve the
Problem