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POWER FAILURE CIRCUIT
SAFETY PRECAUTIONS
CPU (IC5500) is programmed so the set will go to standby mode when there is circuit failure as described
below. (Refer to“Block Diagram Power Lines”.)
This unit is equipped with a Power Failure Detector function included in the CPU which checks for an
abnormal condition in the chassis power supplies.
If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the
CPU will turn the unit off to prevent further damage:
•
Failure within the power supply circuits.
•
A short circuit in the load side from the supply.
Power Failure: Detected voltage failure for circuit.
(Connected to IC5500 pin G22.)
(Normal: High; Failure: Low)
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU
will shut off the power within three seconds.
Check the following if the unit is turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for a short time.
2. Connect a DC Voltmeter to the circuits shown below.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.
5. Check all circuits shown below.
Note: If the power failure is detected when the TV set is switched on, the set will enter the standby mode;
If such power failure is detected 3 times continously, the set cannot be switched On. To reset the
operating programs of the CPU it is necessary to disconnect the AC cord for a short time.
D1601
POWER_FAIL0
P12V
D1602
POWER_FAIL0
POWER_ON
D1600
POWER_FAIL0
POWER_5V
1
4,5
MainSub
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