Cofdm Demodulator - Grundig Davio 20 LCD 51-5732 DVB-T Service Manual

GRUNDIG Service
Hauptplatte / Main Board – COFDM Demodulator
switch on (trigger: S202-13)
≥
GND
ER OPTION
C709
IFD2
1N
C662
IFD1
1N
R723
100R
SDAT
SCLT
_DIG_FE
R724
100R
FROM MPEG DECODER EMM2LL
C652
100N
GND
1V2D_DIG_FE
C659 C660
100N 100N
T
• ª
1V2A_DIG_FE
49
AINP_Q
50
AINM_Q
51
3V3A_DIG_FE AVDD
52
GND AVSS
53
GND GUARD_Q
54
C645 DAREFP
GND
55
100N DAREFM
C646 C647
56
GND GUARD_I
82p
82p
57
AINM_I
L374
58
AIN_I
470nH
59
GND AVSS
5V-IF 60
3V3A_DIG_FE AVDD
C663
61
REFIN
R721 R722
GND
62
4K7 4K7
REFOUT
100N
63
TUNERDAT
64
TUNERCLK
R725
IFAGC
1K
C664
470N
GND
5V-OUT
C507
R544 R545
100N
4k7 560
GND
T321
R543
BC847B
4k7
R542
1 T324
CVBS
BC857B
1K
8
R553 R566
1k5 270
GND GND GND
R565
DELAY
47K
C518
10N
º
GND
C666 C667
X700
33p 33p
20.48MHz
R739
100R
R738
2M2
1V2D_DIG_FE 3V3D_DIG_FE 3V3D_DIG_FE
1V2D_DIG_FE
GND GND GND GND GND
CXD1968

COFDM Demodulator

CXD1976
GND GND
1V2D_DIG_FE 3V3D_DIG_FE
3V3A_DIG_FE
R726
RESET_COFDM
27
*
C665
*
GND
R547
R546
C508
0R
150
10k
L332
R548
1 3
C509
1 3
120 82
T322
GND
BC847B
C520
R549
R551
120 100 100
180
R687
CVBS 1Vpp
2Vpp
470R
8
R688
T330 470R
BC847B
GND
GND
2 - 
⁄
R736
GND
10k
GND GND
U700
32
TMS
31
TDI
30
TDO
R735
29
TCLK GND
10k
28
CVSS GND
27
CVDD 1V2D_DIG_FE
26 R734 100R SDA_MD
SDA
25 R733 100R SCL_MD
SCL
24
DVDD 3V3D_DIG_FE
23
DVSS
22 GND
TSDATA7
47R
R732
TS_DATA7
21 1 2
TSDATA6 TS_DATA6
3 4
TS_DATA5
20 5 6
TSDATA5 TS_DATA4
7 8
19
TSDATA4
47R
R731
18 TS_DATA3
TSDATA3 1 2
TS_DATA2
3 4
17 TS_DATA1
TSDATA2 5 6
TS_DATA0
7 8
32
TS_DATA[0..7]
GND
1V2D_DIG_FE
R730 47R
TS_CLK
1 2 TS_CLK
TS_VALID
3 4 TS_VALID
TS_START
5 6 TS_START
TS_ERROR
7 8
To MPEG
5V-IF
R678
680R
C640
TUNER_PIP
47nF
R418
R550 R552
9
180 330R
47R
L328
R419
1 2
TV-CVBS
C521
0R/0805
47R
C478
1
C477
T325 330pF/NC
330pF/NC
BC857B R420
47R
GND GND GND
Chassis LX IDTV (iX)
¤
28
SDA_COFDM
From MPEG
SCL_COFDM
31
30
29
9
TUNER_SC
TUNER_SC
C442
TUNER-CVBS
TUNER_CVBS
47nF
C443
VCOM0
VCOM0
47nF