XOCECO PH-50FB31, Service Manual, Page: 5 / 50

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effect.
1.21 There is piece of insulator stuck on the rear chassis corresponding to the power supply board.
It is used to isolate the cool part from the hot part. Please take care to keep it intact lest it should
become a potential safety trouble.
1.22 In addition to plasma screen, the glass is a part of high value. It has such functions as
anti-radiation, adjustment of color temperature etc. Please handle it carefully.
2. “Criterion for Identifying the Defects on Screen”
The PDP produced by our Company at present uses the following criterion for identifying the
defective points:
2.1 42” Plasma PDP panel:
There may appear three kinds of defective points for this model as shown in Fig.1, i.e., bright spot
(remain bright); dark spot (non-illuminating); flickering spot (continuously flickering).
However they should not exceed the specification as in table 1. Otherwise the product shall be
deemed as sub-standard.
Figure 1 Defective Points
Table 1 Criterion for Three Kinds of Defective Points
Kind Area A Area B Remark
Dark spots No more than 2 No more than 8
Bright spot No more than 1 No more than 2
Flickering spot No more than 1 No more than 2
Total number of defective
points in A and B shall not
exceed 8. The distance
between two defective
points shall not be shorter
than 15mm.
2.2 50” Plasma PDP panel:
There may appear three kinds of defective points for this model as shown in Fig.2 i.e., bright spot
(remain bright); dark spot (non-illuminating); flickering spot (remain flickering).
However they should not exceed the specification as in table 2. Otherwise the product shall be
Zone B
Zone A
H
W/4 W/2 W/4
H/2
H/4
H/4
W