30
BLOCK DIAGRAM
HVG
(PHILIPS)
VIDEO D-SUB
RGB H/V
VIDEO PRE AMP
LM1253A(NS)
VIDEO OUT AMP
LM2453(NS)
HV DRIVE
/ CONTROL
MCU
MC68HC908BD48
(MOTOLORA)
H/V OSC Processor
TDA4856
(PHILIPS)
Geometrical
Compensatio
H-Driver
Drive
Transformer
H/V Moire
Cancellation
USB-PORT
1 Up Stream
4 Down Stream
AC INPUT
SMPS
Transformer
H/Def Output
TR/Damper
C/S Switching
2SC5411
DD54RC
(TOSHIBA)
Auto
H/Linearity
OP-Amp
V-Driver
KA2142
(SAMSUNG)
IIC
Control
PWM
D/A
CRT
SOCKET
FOCUS-UNIT
FBT
IIC
Control
DYNAMIC
FOCUS
190V
80V
+14V
-14V
HT
5V
FOCUS
OUTPUT
C5042F
(SAMSUNG)
Summary of Contents for 720D
Page 17: ...15 TROUBLESHOOTING HINTS 1 No Character...
Page 18: ...16 2 No Raster...
Page 19: ...17 3 A missing Color...
Page 20: ...18 4 Abnormal OSD Font...
Page 22: ...20 6 Unstable Picture 6 1 Horizontal...
Page 23: ...21 6 2 V OSC Deflection Circuit...
Page 24: ...22 7 Focus...
Page 25: ...23 7 1 Dynamic Focus FvH Fvv 720D 300V 140V 905D 320V 180V 905DS 400V 200V 905DF 350V 170V...
Page 26: ...24 8 Convergence...
Page 28: ...26 9 2 Vertical Size...
Page 29: ...27 10 High Voltage Output Circuit...
Page 30: ...28 11 Power Supply Unit P S U Replace R025...
Page 31: ...29...
Page 33: ...31 PCB LAYOUT 720D 905D 905S 905DF Main PCB Component Side...
Page 34: ...32 720D 905D 905S 905DF Main PCB Solder Side...
Page 35: ...33 720D 905D 905S 905DF CRT PCB Component Side 720D 905D 905S 905DF CRT PCB Solder Side...
Page 36: ...34 905D 905DS Control PCB Component Side 905D 905DS Control PCB Solder Side...
Page 37: ...35 905DF Control PCB Component Side 905DF Control PCB Solder Side...
Page 38: ...36 SCHEMATIC DIAGRAM Power or Connection Section...
Page 39: ...37 Control Vertical Section...
Page 40: ...38 Deflection Hige Voltage Section...
Page 41: ...39 Video Section...
Page 42: ...40 EXPLODED VIEW MECHANICAL PARTS LIST 720D...
Page 43: ...905D 41...
Page 44: ...42 905DS...
Page 45: ...43 905DF...
