Power Fail Circuit - Sanyo PDP-42H1EV Service Manual

■ Power Fail Circuit

CPU (IC801) is programmed that the set goes to standby mode when there is circuit fail as
below.
1. AUDIO AMP FAIL(2) : Detected the fail of Audio AMP IC (IC071)
2. POWER FAIL (3) : Detected the voltage fail in SUB CPU Unit
3. POWER FAIL (1) : Detected the voltage fail in SUB CPU Unit (1 point) and Main Unit (6 points).
4. OTHERS
TEMPERATURE FAIL : Detected the temperature fail ( about 80 degree) by thermal sensor IC (IC1981). CPU
FAN FAIL : Detected the fan fail by the communication to FAN & Sensor Control IC (IC1821).
IC801
52
FAN FAIL
78
TEM. FAIL
P FAIL 2 55
P FAIL 3 56
P FAIL 1 54
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communicates to FAN & Sensor Control IC (IC1821) for detection.
(The set does not go to standby mode in this fail. Display Only.)
Fan Fail Detect ( To IC1821 37 )
Temperature Fail Detect ( To IC1821 38 )
Sound AMP Fail Detect ( To IC071 17 )
Power Fail Detect
Not used in this model.
Power Fail Detect
Q831/2
(SUB CPU)
( Not used in this model.)
(SUB CPU)
(Main)
D102 5VANA
3.3VYC
D7080/1
D7082/3 2.5VGR
D601/2 2.5VFPGA
D603/4
3.3VPIX
D301/2 2.5VPIX
D201/2 3.3VAD
-23-
(SUB CPU)