Rtc Trouble - LG KP500 Service Manual

5.12 RTC trouble

BACKUP BATTERY
2V 0.5mAh
RTC_2V11
RTC_2V11
5 R
TP1
. 4
BAT500
NBL414R- F9J
START
Check All of BAT500 solder
Check TP1 is
high (1.0V)?
Check RTC_2V11
is high?(2.0v)
Assemble
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Only for training and service purposes
TP1
RTC_2V11
0 0
K 7
No
Yes
No
Yes
R500
Change BAT500
Change R500 or
Change U300,
Change Main PCB
- 93 -
5. Trouble shooting
BAT500
LGE Internal Use Only