Logic Part Trouble - LG -YD6250 Service Manual

LG-YD6250

3.3 Logic Part Trouble

3.3.1 When power isn't "Turn On".
Circuit Diagram
Pin#12
Battery Volt < 3.2V
Check the Voltage at pin
Check the Signal High at
Pin #12 of U400
Change main board
Pin#28
Pin#22
Checking Flow
START
Yes
No
No
of U400
Pin #28= 1.83V~1.87V
Pin #22=2.79V~2.91V
Yes
No
Yes
39
Test Point
Pin#12
U400
Figure 3-3-1
Pin#22
Recharge Battery
Change U400 Change U400
Change main board Change main board
Pin#28