Μ-Com Part Check; Ic101(M24C16) Check - LG CM4520 Service Manual

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
2. μ-COM PART CHECK
μ-COM PART
CHECK
YES
Check if
voltage of CN105 Pin10
is 3.7 VA.
YES
Check
both end voltage of
D102, D105.
YES
Check if IC102_Pin49 and
IC102_Pin36,59 are 3.5 V.
YES
X101: 32.768 kHz
X102: 9.8304 MHz
Check the operation.
YES
OK

3. IC101(M24C16) CHECK

CHECK
IC102 PIN47,48
YES
Pin47: DATA
Pin48: CLK.
YES
OK
NO
Refer to
SMPS troubleshooting.
NO
Check if output of
D105(MBR0540) is 3.7 V.
NO
Check D102, D105.
YES
OK
NO
Check μ-COM
voltage 3.5 V.
YES
Check μ-COM.
YES
OK
3-20
NO
Replace D102, D105.
NO
Refer to μ-COM troubleshooting.
NO
Replace μ-COM.