cromax X458, Service Manual, Page: 28 / 48

X458 L3 Service Manual
28
No/Low sound from Speaker
YES
NO
NO
NO
YES
YES
YES
NO
NO
Set the phone as
normal mode
Turn on the speaker,
measure the wave
signal by oscillograph
No sound or noise
Remove the speaker and
measure with multimeter to
see if there’s any sound.
Replace speaker.
The phone is in
Silent mode.
Check if the volume
is in lowest mode.
Turn up the volume.
Replace U101 MT6260
Press power on and side button to
check if there’s the ring is normal
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