Daewoo DTH-29U3 Service Manual page 69

CP830F Service Manual
On normal run mode, I701 microcontroller pin 52 (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 10V 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:
5-10-2-1-2 power supply circuit diagram during TV set normal run
I827
2.5V
1
14V 4.6V
130V
-68-
I826
15V
D870
130V
10V
1.8V
I824
3.3V
I621
C871