Service manual

Page 29
MD 1772LB (B1770NSL/T)
MEDION
8 Block Diagram
R911, R912, Q903,
Q904, Q902, Q905
VIDEO AMP
R971, R972, Q963,
Q964, Q962, Q965
R941, R942, Q933,
Q934, Q932, Q935
Q901
R BUFFER &
DC RESTORE
Q961
B BUFFER &
DC RESTORE
Q931
G BUFFER &
DC RESTORE
I501
TDA4886
VIDEO PREAMP
I502
MTV021-21
OSD
I701
NT6861 AU
I702
24C21
E
2
PROM
I703
2404
5V (OSD)
T401
TDA 4856
DEG
CKT
VERTICAL
O/P
I301
5V
REGULATOR
QI804
8V
REGULATOR
I503
KEY
CONTROL
LED
RESET
CKT
R735
C710
BRIDGE
DIODE
LOW VOLTAGE
DROP DOWN
SMPS
POWER
O/P
T802
Q811
7V
SWITCH
12V SWITCH
Q813
LINE
FILTER
H DRIVER
Q402
D403
C406
B+
DRIVER
Q405
T403
LINEARITY
CONTROL
L404, L405
BRIGHTNESS
CONTROL&
SPOT KILLER
ABL
CONTROL
CKT Q418,
Q419
G2 CONTROL VR
Q413
CANCELING
CKT
I402
PWM CONTROL
TL494/KA7500
T402
FBT
Q411
FBT
DRIVER
H CENTER
Q406
VR403
XRP
CKT
B R
G
GND GND GND
P901
R
G
B
HEATER
P903
G1
6.3V
12V
80V
GND
130V
GND
G1 G2
FOCUS 1
FOCUS 2
4V
BRG8VRGB
SDA1
SCL1
ABL
P501
B-IN
R-IN
G-IN
SCL
SDA
DDC 5V
S705
SCL
SDA
SCL
SDA
NORMAL
DDC
FACTORY
ATE
BRIGHTNESS
CONTROL
V SYNC
H SYNC
SCL
SDA
O/R
SCL 1
SDA 1
CLBL
HFLB1
VTTL
HFLB1
130V
48V
-130V
P301
+H
-H
+V
-V
VTTL
HTTL
SCL1
SDA1
OFF
STAND-BY
DEG.
SCL1
SDA1
12V
48V
12V
VOUT 1
VOUT 2
XRP
45V
80V
45V
12V
7V