Daewoo DTA-14C4TFF Service Manual page 35

In normal run mode, I501 microcontroller pin 63 (power) is set to high
So, I810 controlled rectifier is not conducting
- Q809 is conducting. So, Q808 is not conducting and Q807 is conducting
- So, Q807 collector is connected to the ground and I810 controlled rectifier gate pin is set to low (no conducting)
So, current from 11V DC voltage (from T801 SMPS transformer pin 13) does not flow through Q811 and Q810
transistors but flows through I806 IC error amplifier
- Q809 is conducting. So, Q810 is not conducting and no current flows from Q810 collector to the ground
Therefore, the power circuit diagram is the following one:
9-2-1-2. power supply circuit diagram during TV set normal run
14.5V (CP785)
12.5V (CP385)
C861
D801... D804
(GRAETZ BRI DGE )
SW 801
PO W ER
SW ITCH
MA I N AC VOLTAGE
Power supply operation during TV set normal run
5V
3
I820
5V
REGULATOR
1
C832
D860
D830
D831
9
12 13
8.5V 11.5V
14.5V
12.5V 8V 11V
T801 SM PS TRANSFORMER
2 4
L801
3
D
I801
MOSFET AND
CONTROL I C
C823
D820
16
143V
123V / 113V
13
FUNCTIONAL DESCRIPTION
3.3V
3
I823
3.3V
REGULATOR
1
11V
I822
1
8 V
REGULATOR
143V (CP785)
C813
123V-113V (CP385)
R823
1
I806
I C ERROR AMPLIFIER
2 3
R810
11V
APPENDIX
6V
8V
3