LG MICRO Hi-Fi SYSTEM Service Manual page 15

2. P-SEN
P-SENS
YES
Check
NO
the pin6 of P9702
if DC V is over
5.6V
YES
OK
4. MICOM PART CHECK I
MICOM PART
CHECK I
YES
Check
NO
P7904 6pin
P-SENS
YES
Check
power of both
NO
terminals of IC101
KIA7042
YES
Check IC100
LC87F5NC8A 4pin
power
YES
OK
Check power circuit
troubleshooting
Refer to SMPS
troubleshooting
Check if
NO
IC101 KIA7042
input is over 5V
YES
Check if output voltage
of IC101 KIA7042 is
4.3V
YES
OK
3-2
3. VKK PART CHECK
VKK CHECK
YES
Check
the pin3 of P9702
if DC V is over
32V ±1
YES
OK
Check the
NO
related part of IC101
KIA7042
YES
NO
Check power circuit
troubleshooting.
Replace the
related parts