Mechanical Disassembly; Protection Circuit - Sanyo CP28WF1 Service Manual

Mechanical Disassembly

CABINET BACK REMOVAL
1. Refer to Figure 1, remove 16 screws.
2. Pull off cabinet back and remove.
Figure 1. Cabinet Back Removal

Protection Circuit

This TV set has a built-in power supply protection circuit.
It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality occurs
during TV reception, the TV set goes to the stand-by mode.
When an abnormality occurs during TV reception, it causes pin 127 of the CPU to go continually Low (less than
2.0V) for about 2 second. The CPU detects that this has occurred and outputs the signal from pin 106 to switch off
the power supply lines.
I Releasing the protective circuit and restoring power supply
To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON again via
either the main power switch or the ON-OFF button on the remote control. This will work only if the power supply
trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be restored and the
circuit will have to be repaired.
AV1 IN
S-VIDEO
AUDIO AUDIO
R R
(MONO)
L
L
C
R VIDEO
ANT. 75Ω
Y C
B
AV3/DVD MONITOR
INPUT OUT
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