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On normal run mode, I501 microcontroller pin 1 (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 14V 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 :
* power supply circuit diagram during TV set normal run
Summary of Contents for DTP-28B1
Page 29: ...29 Block diagram TDA8944J...
Page 32: ...32...
Page 34: ...34 Block diagram TDA6107Q...
Page 39: ...39 5 Circuit description 5 1 Block diagram...
Page 57: ...57 5 9 2 2 STR F6654 oscillating operation...
Page 73: ...73 7 Exploded View 7 5 DTP 28B1...
Page 74: ...PRINTED CIRCUIT BOARD PCB MAIN...
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