LG KG270 Service Manual - Page 61
RTC Trouble
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4. TROUBLE SHOOTING 4.7 RTC Trouble CIRCUIT Check Points - 32.768KHz is right clock - The power of RTC is right. SWITCH_ON OSC32K N7 P6 R5 F32K B4 CLKOUT 32KIN 32KOUT X100 4 3 1 2 MC-146_12_5PF 32.768KHz C112 1u PWRON 32KOUT 32KIN CHG_STATUS R100 6.8K BAT100 IREF G13 C114 220n R101 22K C104 18p C105 18p H15 F12 H13 VBAT_2 VBAT_1 VBAT_3 H14 VBAT_4 W_LED_FBP J14 W_LED_FBN J12 G15 G14 K12 G12 VREFP AGND VDD_LD1 VDD_LRTC - 62 -
4. TROUBLE SHOOTING
- 62 -
4.7 RTC Trouble
Check Points
- 32.768KHz is right clock
- The power of RTC is right.
SWITCH_ON
N7
OSC32K
P6
F32K
R5
B4
CLKOUT
CHG_STATUS
32KOUT
PWRON
32KIN
X100
MC-146_12_5PF
1
2
3
4
32.768KHz
C104
18p
C105
18p
32KIN
32KOUT
R101
22K
BAT100
C114
6.8K
R100
220n
W_LED_FBN
J12
W_LED_FBP
J14
G15
VREFP
G12
VDD_LD1
VDD_LRTC
K12
H13
VBAT_1
VBAT_2
F12
H15
VBAT_3
VBAT_4
H14
IREF
G13
AGND
G14
C112
1u
CIRCUIT