Bad noise on t20 Speaker
 

There is t20,With a noise on speaker(like the sound when you put phone near a radio or tape speaker)
When i remove the mic,it cuts,
I changed the mic and mic cable,but not solved.
plkease help

hi mate....

try to rehot or reball both of bga chips that are below cpu,one by one.......

Try to clean very well the contact betwean mic and cable ?maybe dirt .(worked for me)..If not the path to the bga chips is simple chack it could be bad filters...if this doesn't work try what jero says but is judt one responsable for audio (see schematics)

thanks i will try

Hi,
here there's many things to test:
- May be you have bad mic quality.
- Audio filtring is bad.
* passive filter such as some RLC bridge
* Active filter such as the audio IC and the proscessor.
So make a good flux and rehot all Audio circuit( be carefull to not heat the CPU very well elese your phone will go forever).
use service manual to test RLC filtring.
good luck

problem solved .there was a filter problem.
thanks.