LG GB210 - Page 72

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Only for training and service purposes
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4. TROUBLE SHOOTING
START
Is TP2 Voltage level
LOW?
NO
YES
YES
Earphone will work properly
Can you hear your
voice from
the earphone?
Set the audio part of the test
Equipment to echo mode
Change the earphone
and try again
NO
Can you hear
the sound from
the earphone?
Set the audio part of the test
equipment to PRBS or
Continuous wave mode
YES
YES
ResolderCN300
CHECKING FLOW
Check TP1 voltage. Is it low?
Resolder TP2
NO
YES
Can you hear
the sound from
the earphone?
NO
Change the earphone
and try again
NO
Can you hear your
voice from
the earphone?
NO
Resolder TP3
OR Change the U201
Resolder TP4
Or Change the U103