NEC DTE-29U1TH - Page 49

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Service Manual CP-785F
2
4
3
DRAIN
I801 MOSFET AND CONTROL IC
1
MAIN AC VOLTAGE
I804 OPTO COUPLER
I823 3.3V REGULATOR
I703 IR RECEIVER
FRONT MASK
BUTTONS
I810 CONTROLLED RECTIFIER SWITCHING CIRCUIT
T 801 SM PS TRA N S
I501 MAIN IC
OCP FB
16
D821
I810 controlled rectifier
HIGH
C841
C840
R713
1
3
1
2
61
64
56
54
7
63
CONDUCTING
IR IN
µ
com
supply voltage
KEY IN
POWER
R888
C888
Q809
Q810
Q811
D811
D825
R810
L801
D806
C808
SW801 POWER SWITCH
C850
R806
8
4
3
1
2
R870
HIGH
LOW
LOW
CONDUCTING
CONDUCTING
AROUND 6V dc
AROUND 3.3Vdc
Power supply operation in stand - by mode
D801...D804 GRAETZ BRIDGE
b) TV set on stand-by mode
* TV set circuit diagram on stand-by mode