25
9-2-1-3. power supply functioning during TV set normal run mode
- I801 transmits controlled pulses to T801 which generates DC voltages after rectification by secondary side diodes and electrolytic
capacitors (for example by D820 and C813 to give 124V -110V supply voltage line).
- 8V, 5V, 3.3V supply voltage lines have stabilised voltages obtained by I822, I820, I823 voltage regulators.
- On 124V-110V supply voltage line, R823 resistor has been chosen to give the exact DC voltage required on this line.
- 124V-110V supply voltage line includes an IC error amplifier (I806) which corrects unexpected DC voltage variations on this line.
9-2-1-4. power supply IC delivery during TV set normal run
9-2-2. TV set in stand-by mode
9-2-2-1. TV set circuit diagram in stand-by mode
power supply line IC power supply delivery Remarks
124V-110V
FBT
FBT supplies 45V to I301 vertical IC
FBT supplies 14V to I301 vertical IC
FBT supplies 33V to the tuner
FBT supplies 185V to I901 video amplifier pin 6
13.5V I601 pin 1
11V T401 H- drive
8V I501 Main IC pins 14-39
6V I703 IR receiver pin 1
5V I702 EEPROM pin 8
tuner
3.3V Main IC
µ
com part pins 54-56-61
2 4
3
DRAIN
I801
MOFSET AND
CONTROL IC
1
MAIN AC VOLTAGE
I804
OPTO
COUPLER
I823 3.3V
REGULATOR
I703 IR
RECEIVER
FRONT
MASK
BUTTONS
I810
CONTROLLED
RECTIFIER
SWITCHING
CIRCUIT
T801 SMPS TRAN
S
I501
MAIN
IC
OCP
FB
D801...D804
GRAETZ BRIDGE
16
D821
I810
controlled rectifier
HIGH
C841
C840
R713
1
3
1
2
61
64
56
54
7
63
CONDUCTING
IR IN
mcom
supply
voltage
KEY IN
POWER
R888
C888
Q809
Q810
Q811
D811
D825
R810
L801
D806
C808
SW801
POWER SWITCH
C850
R806
8
4
3
1
2
R870
HIGH
LOW
LOW
CONDUCTING
CONDUCTING
AROUND
6Vdc
AROUND
3.3Vdc
Power supply operation in stand - by mode
APPENDIX
FUNCTIONAL DESCRIPTION
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