XOCECO PH-50HA31, Service Manual

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narrow and in bad ventilation. 
1.10 There are quite a number of circuits in PDP that are integrated ones. Please be on guard 
against static electricity. During maintenance operation be sure to cover yourself with anti-static bag 
and before operation make sure to have it sufficiently grounded.       
1.11 There are a big number of connection wires distributed around the screen. Please take care 
not to touch or scuff them during maintenance or removing the screen, because once they are 
damaged the screen will fail to work and it’s not possible to repair it.   
If the connection wires, connectors or components fixed by the thermotropic glue need to disengage 
when service, please soak the thermotropic glue into the alcohol and then pull them out in case of 
damage. 
1.12 Connector for the circuit board of the screen part is relatively fine and delicate. Please take 
care in the replacement operation lest it should get damaged. 
1.13 Special care must be taken during transportation and handling because strenuous vibration 
could lead to screen glass breakage or damage on the driving circuitry. Be sure to use a strong 
outer case to pack it up before transportation or handling.   
1.14 Please put it for storage in an environment in which the conditions are under control so as to 
prevent the temperature and humidity from exceeding the scope stipulated in the specification. For 
prolonged storage please cover it with anti-moisture bag and have them piled and stored in one 
place. The environmental conditions are tabulated as below:       
 

Temperature Scope 

for 

operation 0~50centigrade 

Scope for storage 

-15~60centigrade 

Humidity 

Scope for operation 

20%~80% 

Scope for storage 

20%~80% 

 
1.15 If a fixed picture is displayed for a long time, difference in its brightness and color may occur 
compared with movable pictures. But it doesn’t show any problem and the reason is that there is 
reduced density of fluorescent powder in the former. On the other hand, even if changes take place 
in the picture, it can keep its brightness for a period of time (several minutes). It’s a feature inherent 
with plasma and it’s not abnormal. However please try as much as possible to avoid showing a still 
picture of high brightness for a long time during operation.     
1.16 As a digitalized display devise, this module is provided with error diffusion technology and the 
gray scale and false enhancement of contour can be displayed by reusing of sub-field. As compared 
with cathode ray tube, it can be found in the moving picture that at the brim of the face of a person 
there are some wrong colors. 
1.17 During the display of graph (indicating the gradual change in brightness horizontally or 
vertically) resulting from gray scale test it can be found that the brightness for the two adjacent 
levels is uneven. This is caused by the reuse of sub-field, the display of load rectification and the 
electrolysis. 
1.18 The screen front plate is of glass. Please make sure that the screen has been put in place 
during erection. If it is not in place before the erection begins it may lead to screen crack or 
breakage.   
1.19 Make sure the screw used in the mounting of the screen is of the original specs lest it should 
cause damage to the screen due to mismatch. Special care should be taken not to use too long or