XOCECO PS42K8, Руководство по обслуживанию

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Table 1. For factory preset
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. Introduction of working principle of Plasma TV PS-42K8
The plane screen technology of Plasma is the latest state of art, and it is the best
selection of high quality picture and big pure flat screen. The plasma display PDP is a kind
of display device by means of gas discharging. This kind of screen adopts plasma tube as
light emitting unit. PDP panel consists of many pixel units (plasma tube), such as the
screen of the 42” PDP sold currently, which consists of 852*480 pixel units. Each pixel unit
includes three sub-pixel units. Each pixel unit is a plasma tube, which displays red, green
and blue separately. Each chamber to which each plasma tube corresponds is filled with
neon or xenon
gas. When high voltage is applied between the poles of plasma tubes, the
gas sealed in the chamber of plasma tube between two layers of glass of radiates
ultraviolet light, which in turn excites the fluorescence powder of three base color - red,
green and blue - on the plane screen radiates visible light. Each plasma tube, as a pixel unit,
produces different pictures with different color and grey density through various
combinations of its changes in brightness and color, which is similar to the light emission of
CRT. Compared with other displays, the plasma technology has apparent differences. Its
construction and composition is ahead of other technologies. The working principal is
similar to normal fluorescent lamp. The color picture of the TV is formed of the light
emissions by each pixel unit of fluorescent powder. Thus, the picture looks bright, fresh,
clean and well focused. Besides, The most outstanding characteristic of plasma TV is that it
can be made super thin, and it’s very easy to make the screen as large as over 40 inches
while the thickness is less than 100 mm. (The thickness of our PS-42K8 is 79mm only,
which is the thinnest in the market)
1. For the working principle and process flow of PS42K8, see block diagram
of complete TV set. The signal flow process is described briefly as follows:
By way of TUNA01, the RF signal of satellite TV, BS-RF produces color full TV signal
TV-BS and audio frequency signal BS-R/L. By way of TUNA02, the RF signal of broadcast
TV produces full color TV signal TV-IN2 and second IF sound signal SIF. The VIDEO signal
selected by PI50V330(NA07)through TV-BS and TV-IN2 is sent to video decoder
VPC3230(U29). Video signals AV,SVHS and YcbCr are sent to U29 respectively. After the
selection of above four video signals, one route is as AV OUT, another route is for color
decode. Then the signal in the format of ITU-R656 of 8 bits is sent to FLI2310(U13)for
progressive processing.
D4 is sent to MST9883(U30), where the signal undergoes digit to analog conversion
Item Factory
Preset
Item Factory
Preset
Item Factory
Preset
Picture
mode
NATURE OSD
language
Japanese BS POWER ASSOCIATE
Sound
mode
NEWS VGA color
temperature
9300 AV1/DECODER AV
N/R WEAK SRS ON
SCREEN 16:9 BALANCE ON