Daewoo DTA-14C4TFF Service Manual page 37

9-2-2-2. TV set stand-by mode operations
-In stand-by mode, I501 microcontroller pin 63 (power) is set to low.
- So, Q809 collector is set to high.
-Then, I810 controlled rectifier gate pin is set to high and I810 is conducting.
- So, current flows from pin 16 SMPS transformer to the ground via I804 optocoupler and Q810 and Q811 transistors
(which are conducting).
- In these conditions, I801 delivers pulses on light mode and T801 produces voltages with reduced power.
- As I810 is conducting, current flows also from pin 16 SMPS transformer to I823 (3.3V regulator) for I501 µcom, IR receiver
and front mask buttons supply voltage (then, remote control or front mask buttons can be activated to leave stand-by mode).
I810
CONTROLLED
RECTIFIER
HIGH
R830
R820
C830
HIGH
Q807
LOW
I810 controlled rectifier switching circuit
6V DC
R829
Q808
HIGH
Q809
15
APPENDIX
FUNCTIONAL DESCRIPTION
POWER
LOW