Daewoo DWP-28W2ZLF - Manual (Page 65)

Appendix Service manual WP-795
- 38 -
. If the TV set was on stand-by mode before switching off, the microcontroller switches TV set to
stand-by mode, decreasing power pin voltage (pin 63). this matter will be explained on
paragraph 5-9-2-b.
2-9-1-3 Reset pulse circuit:
2-9-1-4 Reset pulse circuit operations description
- When DC supply voltage from I823 regulator starts rising (from 0V to 1.2V), no current flows through
D591 zener diode. So, Q510 is in off mode.
Also V
be Q511
=Vcc/2 -Vcc = -Vcc/2 > -0.6V. So, Q511 is in off mode.
Then, no voltage reaches I501 pin 60.
- When this voltage reaches 1.2 V, Q510 stays in off mode
but V
be Q511
= -0.6V. So, Q511 is switched on and starts driving DC supply voltage to I501 pin 60.