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General rules:
1. Before the rear cover is opened for repair, the unit must be placed horizontally on
a soft surface with no static charges.
2. Before the chassis are repaired (with power on), a 1:1 isolation transformer should
be connected between the AC power supply and this unit.
3. Prior to the repair, inspect the parts in the high-voltage circuits and the initial
connection of the circuits. Any connectors or elements damaged due to the short
circuit should be replaced.
4. Considering the safety of the product, any replacement parts should be within the
scope of the technical specifications indicated in the service manual. Only the
printed circuit board diagram numbers designated in the service manual can be
used as replacement.
5. After the repair, all the protection components should be checked for correct
installation, and the initial connection mode should be confirmed.
6. Before the cover is closed, check that there are no loose parts in the unit.
7. After the repair, perform the following inspections of withstand voltage and
insulance to avoid electroshock.
Method of inspections:
Pull out the AC power cable for connecting the power supply and the
connection receptacle of this unit.
Switch on the power switch of the TV. Connect ZHZ4B withstand voltage and
insulance testing set and the PDP TV as shown in the following diagram:
Set the insulation at 4M
Ω
/500V. Set the time as 4 seconds. Set the reading of
withstand voltage as 1.5KV. Set the leakage current as 5mA. And set the time
as 1 minute. No alarming signals should appear in the testing set during the
above testings.