Daewoo DSC-3220E/3220L service manual Controlled Rectifier 6V DC High

Service manual SC-150

I810

CONTROLLED

RECTIFIER

6V DC
HIGH	R829
R830

R820

C830

HIGH

Q807

Q808

LOW

HIGH

Q809

POWER LOW

Fig : I810 controlled rectifier switching circuit

* TV set stand-by mode operations

-On stand-by mode, I501 microcontroller pin 1 (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 (5V / 3.3V regulator) for I501

com, IR receiver and front mask buttons supply voltage (then, remote control or front mask buttons can be activated to leave stand-by mode).

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