Daewoo DDT-21H9ZZF, Service Manual

Page: 52 / 83

-51-
Service Manual CP-099F
Fig : Power supply operation during TV set normal run
On normal run mode, I501 microcontroller pin 5(power) is set to Low
- Q503 is unconducting So, Q802 is couducting.
- So, Q802 collector is connected to the ground and Y801 switch relay is couducting and T801 SMPS
Transformer is supply v143V, S.B+, +12 V, +5 V.
*Power supply circuit diagram during TV set normal run
I503
STAND BY 5 V 11
STAND BY 3.3 V
143 V
12 V
8 V
2.5 V
3.3 V
5.3 V
5 V
Sound B+
H.drive Trans
18
T801
SMPS
Trans-
former
T802
16
15
13
12
10
I811
I810
I806
I805
I807
I808
* POWER SUPPLY Voltage during TV set normal run.
FBT VOLTAGE
VIDEO VERTICAL VERTICAL H.V at max. max Beam
H.V
SCREEN HEATER
B+ 16.5V 45V beam cur rent current VOLTAGE VOLTAGE
180 10% 12.0 1V 46 2V
27.0 1kV 1100 2kV 850~ 6.2+0.1
at ib=1100 A 50 A and less 950DVC /-0.2Vrms
SMPS TRANSFORMER VOLTAGE
MAIN SOUND TV 12V DVD 5V TV 5V DVD 3.3V
B+ B+
Pin 18 Pin 16 Pin 15 Pin 12 Pin 10 Pin 13
143 2V 14.0 10% 14.0 10% 8.5 1V 8.5 1V 5.0 10%
b) TV set on stand-by mode
* TV set circuit diagram on stand-by mode