Μ-Com Part Check-1; Μ-Com Part Check-2 - LG DM2740 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
4. μ-COM PART CHECK-1
μ-com part check-1
Check
L206 3.7VA.
YES
Check
both end voltage
of R186.
YES
Check voltage of IC101 Pin4.
YES
OK
5. μ-COM PART CHECK-2
μ-com part check-2
Check
L206 3.7 VA.
YES
Check
if output of D100,D101 is
3.3 V.
YES
Check If IC101_Pin14, 40, 55, 89
are 3.3 V.
YES
Check the operation.
X100: 12 MHz, X101: 32.768 kHz
YES
OK
NO
Refer to
SMPS troubleshooting.
Check If
NO
emitter voltage of Q103
is over 3.7 V.
Check if Q103 of collector
voltage is over 2.7 V.
OK
NO
SMPS troubleshooting.
NO
Replace D100, D101.
3-7
NO
YES
YES
Refer to
Check the periphery of Q103.
NO
Replace Q103.