Mobile Hardware and Softwares by: Mehmood Riaz

1 betty ic
betty ic regulates charging.light,charging voltage and also supply power
if damage betty IC handset can not charge not glow display light charging shows but not charge battery and handset can be dead. we can find betty ic in 5130,2690,2700,5310, 6500,5610,6120,7210c, 95 etc.

2 avilma ic
avilma is uem power ic.regulates power to uem
avilma manage power regulating mic.buzzer,speaker.display
damage result in handset dead flashing not complete mic.speaker.display problem.
we can found avilma in 6120,5130,2690,2700,95 etc.

3 thavo ic
thavo is charging regulator ic which can found in 3110 6300 n70 etc.
damage result in no charge chaging shows but not work.light not glow and handset can be dead.

4 retu ic
retu ic is uem rugulator ic which generates power to sim.mic.buzzer.display and sound. also problem in flashing. if doesn't work one of them first you have to change other filter ic like display filter.key filter mic filter