LG MCV902 Service Manual page 53

1-1. OPEN CLOSE NG
CONNECTOR LOCKING CHECK
(PN803, PN804, PN814 )
CHECK POWER
SUPPLY CIRCUIT (PN805, CN806)
CN806 PIN1 : 12V, PIN2 : 6.3V
PN805 PIN8 : +5V_AD
CHECK
VOLTAGE CHANGE OF
OPEN CLOSE IC803 INPUT VOLTAGE
PIN6 : 12V, PIN7 : 6.3V (PN805 PIN2 :
BTL_MUTE, 23 : OPEN,
22 : CLOSE)
CHECK VOLTAGE
CHANGE LO+, LO- OF IC803
(PN805 PIN23 : OPEN,
PIN22 : CLOSE)
DEFECTIVE MECHANISM
YES
YES
YES
YES
NO
DEFECTIVE MAIN POEWR SUPPLY
NO
DEFECTIVE MICOM
NO
DEFECTIVE IC803
4-2