Daewoo DTA - 14C4TFF, Service Manual

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14
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
MOF SET 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 TRANS
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
PO WER SWITCH
C850
R806
8
4
3
1
2
R870
HIGH
LOW
LOW
CONDUCTING
CONDUCTING
AROUND
6V dc
AROUND
3.3Vdc
Power supply operation in stand - by mode
APPENDIX
ALIGNMENT INSTRUCTIONS