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Measure the wave
of pin 8,9 of U1
1*
Check the voltage of
pin 6 ,7 of u1
OK
Replace u1
Check the circuit
between U1 and
U201
Check the U201
measure the wave of
SDA and SCL
1*
repair the circuit of
U101 and Q102
OK
OK
1*
Check the U201
OK
