Daewoo DTA-14C4TFF Service Manual page 36

APPENDIX
FUNCTIONAL DESCRIPTION
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
power supply line
124V-110V
13.5V
11V
8V
6V
5V
3.3V
9-2-2. TV set in stand-by mode
9-2-2-1. TV set circuit diagram in stand-by mode
D801...D804
GRAETZ BRIDGE
SW801
PO WER SWITCH
MAIN AC VOLTAGE
IC power supply delivery
FBT
I601 pin 1
T401 H- drive
I501 Main IC pins 14-39
I703 IR receiver pin 1
I702 EEPROM pin 8
tuner
Main IC µcom part pins 54-56-61
T801 SMPS TRANS
2 4
8
D806
L801
3
DRAIN
I801
R806
OCP
MOF SET AND 1
FB
CONTROL IC
C850
Remarks
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
I810
CONDUCTING
controlled rectifier
D821
HIGH
C841
16
D825
R810
I810
CONTROLLED
RECTIFIER
SWITCHING
CIRCUIT
C808
4 1
R870
I804
D811
3
2
OPTO
COUPLER
CONDUCTING
Q811
HIGH
CONDUCTING
Q810
Q809
Power supply operation in stand - by mode
14
I823 3.3V
1
REGULATOR
C840
AROUND
AROUND
6V dc 3.3Vdc
R713
I703 IR
IR IN
64
2
1
RECEIVER
I501
61
mcom
MAIN
supply
56
voltage
IC
54
FRONT
KEY IN
7
MASK
BUTTONS
POWER
63
LOW
R888
LOW
C888
3