-49-
Service Manual CP-785F
I810
C O N T R O L L E D
RECTIFIER
R820
R830
C830
R829
Q808
6V DC
Q809
Q807
HIGH
HIGH
HIGH
L O W
POWER
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 com, IR receiver and front mask buttons supply voltage (then, remote
control or front mask buttons can be activated to leave stand-by mode).
Summary of Contents for DTE-29U1TH
Page 67: ...Service Manual CP 785F 66 7 Exploded view ...
Page 68: ...Service Manual CP 785F 67 8 PCB Layout 8 1 Main PCB ...
Page 69: ...Service Manual CP 785F 68 8 2 AV PCB ...
Page 70: ... 69 Service Manual CP 785F 9 Circuit Diagram ...
Page 71: ...NEC Corporation 7 1 SHIBA 5 CHOME MINATO KU TOKYO 108 8001 JAPAN ...