3.5 Speaker no sound
First, check speaker ok or not, change a new one;
Second, check B1220, B1221, T1220,T1221 solder ok or not;
Third, check U1420, re-hot or change a new one.
No sound
Is
speaker
OK?
Replace
Speaker
Are B1220, B1221
NC or not?
Check T1220,
T1221 ok or not?
Check
U1420
ADD B1220, B1221
Re-solder uncorrected
component
Hot or change U1420
Y
N
Y
N
N
Y
N
