Mechanical Disassemblies; Service Information; Protection Circuit - Sanyo CP29AF2X Service Manual

Mechanical Disassemblies

CABINET BACK REMOVAL
1. Refer to Figure 1, remove 10 screws.
2. Pull off cabinet back and remove.
Figure 1. Cabinet Back Removal

Service Information

I 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 27 of the CPU to go continually Low (less than
0.75V) for about one second. The CPU detects that this has occurred and outputs the signal from pin 31 to switch
off the power supply lines.
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 INPUT MONITOR
OUT
R
AUDIO
L
S-VIDEO
(MONO)
ANT. 75
VIDEO
Figure 2.
Picture Tube Removal
DEGAUSSING
COIL SOCKET
CHASSIS REMOVAL
1. Remove cabinet back.
2. Discharge the picture tube anode (2nd anode lead) to the dag
coating (picture tube grounding lead).
3. Disconnect Degaussing coil socket (KE), Picture tube socket,
Deflection yoke connector (KDY), Speaker connectors (K002
and K003), and 2nd anode lead.
4. Remove chassis completely by sliding it straight back.
PICTURE TUBE REMOVAL
CAUTION: Do not disturb the deflection yoke or magnet
assembly on the picture tube neck. Care must be taken
to keep these assemblies intact, unless picture tube is
being replaced . Discharge the picture tube to the coat-
ing before handling the tube.
1. Remove chassis, referring to Chassis Removal instructions.
2. Place cabinet's front face down on the soft surface.
3. Remove the screw on each corner of the picture tube and
GENTLY lift the picture tube out of the cabinet.
4. Install a replacement picture tube in reverse order.
Properly install the degaussing coil and picture tube ground
ing lead on the picture tube. See Figure 2.
Note: If the Picture Tube is being replaced, mount the
Degaussing Coil on the picture tube. See Figure 2.
DEGAUSSING
COIL
To CRT
unit ground
-9-
DEGAUSSING
COIL HOLDER
PICTURE TUBE
GROUND LEAD