Durabrand DBTV1901 Service Manual page 38

A B
8
FROM TV POWER
UNREG+12V
7
6
FROM/TO SOUND/AV
5
W806
AUDIO_OUT
C642
AUDIO_IN
50V 1 KA
GND
5
R632
220
W817
FROM/TO MICON/TUNER
4
Y_VIDEO
AT+5V
SYNC
TUNER+5V
RESET
AFT
AGC
IF
3
GND
HD
POWER
OSD_B
OSD_BLK
OSD_G
2
VD
OSD_R
I2C_OFF
SDA
SCL
NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME
OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE
1
A B
G-3
C
CHROMA SCHEMATIC DIAGRAM
6
7
CF604
8.8
EFCT4R5MW5
REG 5.5
Q603
KTC3203_Y-AT
4.9
R615
CF603
EFCT4R5YS5A
470
NC
3.0 2.2 0 7.9 7.9 0 0
48 47 46 45 44 43 42 41
R634
R611 10K
10K 2.3
AUDIO OUT
2.4
C604
AUDIO BYPASS
2.2
50V 1 KA
C655_1
EXT AUDIO IN
3.0
0.0068 Y
C623 0.0033 M
FM DIRECT OUT
46 SW REG CONT
2.9
C632 50V 2.2 KA 47 LIMITER IN
VIF VCO F/B
R618 10M 1/4W 48 IF AGC
3.2
49 QIF OUT
VREG Vcc
8.7
VIF APC FILTER
3.2
VIF VIDEO OUT
M61206FP
2.2
VIF GND
0
C621 0.01 Y
0
AFT OUT
1.9
C626 0.001 Y 64 VIF IN (1)
QIF IN
1 VIF IN (2)
2.8
R606
RF AGC OUT
10K
4.6
C606
RF AGC FILTER
SAW FILTER
2.9
CF601 50V 0.22 KA
SAF45MFY220ZR
OUTOUT G IN IN
1.5
5 4 3 2 1 1 2 3 4 5 6 7
1.5 4.9 4.9 0 4.9 0 0
L601_2
1.2uH
C609
0.01 Y
8
NOTE: THE DC VOLTAGE AT EACH PART WAS MEASURED CAUTION: SINCE THESE PARTS MARKED BY
CRITICAL FOR SAFETY,USE ONES
WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST
WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL. DESCRIBED IN PARTS LIST ONLY
C
D E
(MAIN PCB)
REG
REG
Q605
Q604
KTC3203_Y-AT
KTC3203_Y-AT
7.2 4.9
4.9 7.2 REG
Q606
5.5 5.5
KTC3203_Y-AT
7.9 11.3
8.5
R639
100
R638 22K
R646 47K
5.7 0 5.6 0 0 2.5 3.2 1.9 8.5 C638_1
40 39 38 37 36 35 34 33
50V 4.7 KA
3.3
R642 D605
ACL/ABCL
2.6 1K 11E1-EIC
R IN
0
V PULSE OUT
4.7
G IN
34 EXT C in
0
33 8.7V REG OUT
FAST BLK
32 X'TAL
0 C645
NC
SPOT KILLER
16V 47
7.0
fsc OUT NC
CHROMA IC 2.8
IC601
4.9
VIDEO CHROMA Vcc
4.9
C613_3
V RAMP CAP
63V 1 MKT
4.7
R641_1
V RAMP FEEDBACK
27K 1/4W
2.8
17 V OUT
B IN
16 B OUT
0
STRAT UP Vcc
7.9
10
7.9
W818
V OUT
3.6
8 9 10 11 12 13 14 15 16
0 0 4.9 3.4 3.9 4.9 2.0 2.0 2.0
9
R627 100
R630 100
R631 100
SWITCHING
W829 Q607
DTC114ES
0
4.9
0
ARE
ATTENTION: LES PIECES REPAREES PAR UN
DANGEREUSES AN POINT DE VUE SECURITE
N'UTILISER QUE CELLS DECRITES
DANS LA NOMENCLATURE DES PIECES
D E
F G
C647
50V 1 KA
YK
V_OUT
ABCL
V_FEEDBACK
GND
H_OUT
H_SYNC
B.OUT
G.OUT
R.OUT
CLAMP
CP601
R613_1
INT.MONI
560 1/2W
IIC_OFF
R.SIGNAL
G.SIGNAL
CAUTION: DIGITAL TRANSISTOR
B.SIGNAL
ETANT
AUDIO SIGNAL
F G
H
8
7
FROM SOUND/AV
VIDEO_IN
6
5
4
FROM/TO DEFLECTION/CRT
3
TEST POINT
173979-6
B.OUT 6
5
4
SDA 3
SCL 2
2
GND 1
PCB010
TMX494
DEFLECTION SIGNAL
1
LUMINANCE SIGNAL
TUNER VIDEO SIGNAL
H
G-4