LG CM2760, Service Manual

Page: 17 / 50

3-2
ONE POINT REPAIR GUIDE
1. NO POWER PROBLEM
No power problem occurs when you power on the unit.
1-1. NO POWER
1-1-1. Solution
Replace X201, IC200, IC202.
1-1-2. How to troubleshoot (Countermeasure)
1) Check X201(Crystal).
 If it does not oscillate, replace X201.
2) Check IC200(Reset IC).
 If its output voltage is not more than +2.7 V, replace IC200.
3) Check IC202(DSP IC).
 After Power is ON if the pin48 of IC202 is not ‘High’, replace IC202.
But, the new flash IC need to write program.
1-1-3. Service hint (Any picture/ Remark)
T1
3
_
75
U
13
_
76
P1
0
_
77
U1
4
_
7
8
P
1
1
_
7
9
T1
4
_
80
N1
1
_
81
T1
5
_
82
U
1
5
_
83
T1
6
_
84
U1
6
_
85
U
1
7
_
8
6
P1
2
_
87
P1
3
_
88
FB2 20
100
X2 00
32.768KHZ
R 228 4M 7
C
2
42
22
p
F
C
2
43
22
p
F
GND
X2 01
24M HZ
R 236 1M
C
262
33
pF
C2
6
3
3
3
p
F
GND
C2
3
8
10
4
GND
IR
TUN- SDA
TUN- SCL
AUX- DET
TOUC H -SDA
TOUC H -SCL
R 235
10R
R 234 10R
C
236
1
0
4
GND
C
235
22
0uF
/1
0
V
R 241 330K
B1 7 PD[1 4]
130
E13_VS S33IO
131
D1 4_VDD3 3IO
132
A
1
7
_P
D
[1
5
]
13
3
A
16
_P
D
[0]
13
4
B1
6
_
P
D
[1
]
13
5
B
1
5_
P
D
[2
]
13
6
A
15
_P
D
[3
]
13
7
A1
4
_
P
D
[4
]
13
8
B
1
4_
P
D
[5
]
13
9
B
1
3_
P
D
[6
]
14
0
A1
3
_
P
D
[7
]
14
1
E
9_V
D
D1
2
CO
RE
14
2
D1
0
_
P
N
T
R
S
T
1
4
3
D
1
3_
P
G
P
D
00
14
4
D9
_
PTD
I
14
5
D1
2
_
P
G
P
D
0
1
14
6
D
8
_P
TM
S
14
7
E1
1
_
P
GP
D
0
2
14
8
D7
_
P
T
C
K
14
9
D1
1
_
P
G
P
D
0
3
15
0
E7
_
P
T
D
O
15
1
D
6
_
P
RT
CK
15
2
A
1
2
_
PG
PA
0
0
15
3
B1
2
_
P
G
P
A
01
15
4
B1
1
_
P
G
P
A0
2
15
5
A
1
1
_
PG
PA
0
3
15
6
B
1
0
_
V
SS
3
3I
O
IO3 V3
IO1 V2
DQ
0
D
Q
1
D
Q2
DQ
3
D
Q
4
DQ
5
DQ
6
DQ
7
DQ1 4
DQ
15
S
F-M
IS
O
SF
-M
O
S
I
S
F-S
C
K
SF
-C
S1
AMP -SD- DET
AMP -OT W -DE T
AMP -PDN
RS T
2
VCC
3
GN
D
1
IC2 00
AZ 809
GND
R2 02 33R
C 203
NC
R2 01 10K
R2 00
100R
C 200
104
C 201
NC
C 202
NC
D2 00
NC
D2 01
NC
IO3 V3
IO3 V3
SDRAM (0 ...8)
H P-MUT E
M A0
M A1
M A2
M A3
M A4
M A5
M A6
M A7
M A8
M A9
M A1 1
M A1 0
BA1
BA0
RAS #
CAS #
W E#
CS #
DQM 1
R2 05 33R
R2 06 33R
M A1 2
CK E
CL K R2 04 33R
1 2
3 4
5 6
7 8
RA
2
0
1
33R
1 2
3 4
5 6
7 8
RA
2
0
2
3
3
R
1 2
3 4
5 6
7 8
RA
2
0
3
33R
1 2
3 4
5 6
7 8
RA
2
0
4
33R
1 2
3 4
5 6
7 8
RA
2
0
5
33R
DQM 0
IC202
< MAIN board top view >
IC200 IC200
IC202 IC202
X201 X201