Daewoo DTA-20 T1 Service Manual page 54

* power supply functioning during TV set normal run mode
- I801 transmits controlled pulses to T801 which generates DC voltages after rectifications by
secondary part diodes and electro capacitors (by example by D820 and C813 on 143V (CP785) /
123V -113V (CP385) supply voltage line).
- 8V, 5V, 3.3V supply voltage lines have stabilized voltages obtained by I820, I822, I823 voltage
regulators.
- On 143V (CP785) / 123V-113V (CP385) supply voltage line, R823 resistor has been chosen to reach
exact DC voltage required on this line.
- 143V (CP785) / 123V-113V (CP385) supply voltage line includes an IC error amplifier (I806) which
corrects unexpected DC voltage variations on this line.
* power supply IC delivery during TV set normal run
power supply line
143V (CP785)
123V-113V (CP385)
14.5V (CP785)
12.5V (CP385)
11V
8V
6V
5V
3.3V
b) TV set on stand-by mode
* TV set circuit diagram on stand-by mode
IC power supply delivery
FBT
I602 sound amplifier pins 3-16
T401 H- drive
I501 Main IC pins 14-39
I601 Sound Demod pins 38-39-
40
I703 IR receiver pin 1
I601 Sound Demod pins 7-18-
57
I702 EEPROM pin 8
tuner
Main IC µcom part pins 54-56-
61
- 53 -
Service manual CP 385 / CP785
Remarks
FBT supplies 45V to I301 vertical IC
FBT supplies 45V to T401 H- drive for CP785
FBT supplies 14V to I301 vertical IC
FBT supplies 33V to the tuner
FBT supplies 185V to I901 video amplifier pin 6