DAEWOO ELECTRONICS DTE-21U6TH, Руководство по обслуживанию

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Service manual CP-785AF
- 49 -
I810
CONTROLLED
RECTIFIER
R820
R830
C830
R829
Q808
6V DC
Q809
Q807
HIGH
HIGH
HIGH
LOW
POWER
LOW
I810 controlled rectifier switching circuit
* TV set stand-by mode operations
-On 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
µ
com, IR receiver and front mask buttons supply voltage (then, remote control or front mask
buttons can be activated to leave stand-by mode).