Copyright © 2012 LG Electronics Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Check RF Cable
Y
Maybe MTK2112(IC100)
has problems
Check Tuner(TU1002-1 Power
(3.3V, 1.8V, 1.23V)
N
Replace one of Bead
& Recheck
Y
Check IF Signal pin #10,11
N
Maybe Tuner has problems
Y
3. Digital TV Video Trouble Shooting
S2_SCL
34
S2_F22_OUTPUT
33
3.3V
32
D7
27
D6
26
D5
25
D4
24
D3
23
D2
22
D1
21
Pin No.
Description
1
NC_1
2
RESET
3
SCL
4
SDA
5
3.3V
6
SIF
7
1.8V
8
CVBS
9
T/C_IF_AGC
10
T/C_DIF[P]
11
T/C_DIF[N]
12
NC_2
13
NC_3
14
NC_4
15
GND_1
16
ERROR
17
SYNC
18
VALID
19
MCLK
20
D0
28
GND_2
29
GND_3
30
1.23V
31
S2_RESET
35
S2_SDA
36
LNB
37
GND_4
Checking order
1. Check Tuner power (Pin #5, #7)
2. Check Tuner I2C level (Pin #3, #4)
3. Check Tuner IF Signal (Pin #10, #11)
4. Check Ts level (Pin #20, #21, #22, #23,
#24, #25, #26, #27)
5. Check Ts Signal
Pin #1
Pin #11
Pin #13
Pin #14
Pin #26
Pin #27
Pin #15
Содержание 42PM4700
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