LG M4224C - Trouble Shooting

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
C
2008
- 21 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK POWER BOARD
CHECK P118
(ST_5V)
NO(Low)
CHECK POWER BOARD
CHECK P118
(PWR_ONOFF)
YES(High)
1. Check IC120
2. Check all Vcc of IC120
YES(High)
NO(Low)
YES
YES(High)
CHECK X100
CHECK X100
(14.31818MHz) ?
NO
CHECK RESET IC
CHECK IC118
(HW_RESET) ?
NO(Low)