LG FA162 - Tone Point Repair Guide

3-2
DVD_SPI_CE
REMOCON
RESET
RESET
DVD_SPI_DO
DVD_SPI_DI
KEY1
USB_CTRL
DGND
DGND
DGND
DGND
C110
100nF
C11
3
100nF
DGND
IC103
AZ7027RTRE1
1
VCC
2
GND
3
OUT
X101
32.768KHZ
1
2
3
4
C107
22pF
C106
22pF
C104
12pF
C103
12pF
R104
4.7M
R171
330K
R105
1M
C129
1000uF
C115
100nF
R106
12K
C100
10nF
R108
33(2)
C124
22uF/16V(3)
R167
100
R169
100
R168
100
R112 100
R110
100
R111
100
R164
100
R163
100
R165
100
R166 100
R172
4.7K
R128
10
R129
10
R125 100
R126
100
R109
100
R124
100
R120
100
R121
100
X100
12MHZ
R113 100
R114 100
R116 100
R117 100
R132
R119
47K
DVCC_
3
R173 100
R176
100
R179 100
R185
100
R186
100
3.3VA
R184
10
R183
10
R18
1
4.7
K
NC102
3.3V_MICOM
IC101
LC87FC096AVU
1
I_DVD_CLK
2
O_VFD_DO
3
O_VFD_STB
4
O_VFD_CLK
5
O_DVD_RST
6
O_EQ_STB
7
O_EQ_RST
8
O_PWR_CTRL
9
VDD2
10
VSS2
11
I_IPOD_DET
12
I_PORTABLE_SNS
13
I_HP_DET
14
I_TOUCH_IRQ
15
O_VFD_PWR
16
O_HP_SEL
17
O_PWM_MUTE
18
O_HP_MUTE
19
O_PWM_RST (TAS5548)
20
O_I2S_CTRL1
21
O_I2S_CTRL2
22
O_TUNER_RST
23
O_ADC_CLK
24
P_TUNER_DAT
25
O_TUNER_CLK
26
O_FAN_CTRL
27
P_TOUCH_DAT
28
O_TOUCH_CLK
29
O_EXP_CLK
30
O_EXP_DAT
O
_
PWM
_
DAT
I
_
O_
I_
I
_
AMP
_
CLIP0
51
I_DVD_CE
52
I_REMOCON
53
RESET
54
XT1
55
XT2
56
VSS1
57
CF1
58
CF2
59
VDD1
60
I_KEY1
61
I_MIC_DET
62
O_USB_CTRL
63
O_DVD_DO
64
I_DVD_DI
R107
100(2)
NC103
R146 100
R127 100
(XX
)
3.3V_
M
R130
4.7K
R122
0
R123
0
M6
M7
M17
M23
R170
4.7
K
ONE POINT REPAIR GUIDE
1. NO POWER PROBLEM
No power problem occurs when you power on the unit.
1-1. Solution
Replace X100, IC101, IC103.
1-2. How to troubleshoot (Countermeasure)
1) Check X100(Crystal).
 If it does not oscillate, change X100.
2) Check IC103(Reset IC).
 IF its output voltage is not more than +2.7 V, change IC103.
3) Check IC101(Micom).
 After Power is ON if the 8pin of IC101 is not ‘High’, change IC101.
But, the new μ-com IC need to write program.
1-3. Service hint (Any picture / Remark)
< MAIN board top view >
X100
IC101
IC103