7
■
MAIN PWB Block
1. Video signal processor block
In the MAIN PWB, each video signal selected at the VIDEO PWB is converted into a digital signal for the
purpose of various signal processing such as enlargement, contraction, and so on. The processed signal output
is sent to the plasma display module.
The contents of signal flow control and IC processing for analog signal inputs are different from those for digital
signal inputs (RGB3). In addition, for the respective analog signal inputs, the flow of signals can differ according
to the type of an input signal.
(1) Flow of video signals, video (for RGB inputs), HDTV (for RGB inputs) signals
The RGB signal input entered from the YU connector is converted into a digital signal at the AD converter,
IC6501. (Processing of RGB x 8 bits x 2 phases = 48 lines) IC7501 is used to convert an RGB signal into a
chrominance (422) signal. In IC8003, a horizontal interlace signal of 15 kHz (34 kHz) is converted into a
progressive signal of 31 kHz (67 kHz). IC8502 is in charge of screen size conversion for normal size, full
size, digital zoom, etc. The processed signal inputs are entered in IC9000 again. In this IC9000,
γ
process-
ing, gradation processing, and white balance processing are carried out for digital video signals. In addition,
the synthesis of ON-screen signals is carried out there. In IC9003 and IC9004, 48-bit parallel signals are
processed for conversion into LVDS serial signals and the output is sent to the plasma display module (“AD”
connector).
(2) Flow of DVD and HDTV (chrominance input) signals
The chrominance signal input entered from the YU connector is converted into a digital signal at the AD
converter, IC6501. (Processing of YUV x 8 bits x 2 phases = 48 lines) IC7501 is used for the processing of
color depth and tone. In IC8003, a horizontal interlace signal of 15 kHz (33 kHz) is converted into a progres-
sive signal of 31 kHz (67 kHz). In IC9000, the chrominance signal is converted into the RGB signal. IC8502
is in charge of screen size conversion for normal size, full size, digital zoom, etc. The processed signal
inputs are entered in IC9000 again. In this IC9000,
γ
processing, gradation processing, and white balance
processing are carried out for digital video signals. In addition, the synthesis of ON-screen signals is carried
out there. In IC9003 and IC9004, 48-bit parallel signals are processed for conversion into LVDS serial
signals and the output is sent to the plasma display module (“AD” connector).
LPF
Video:8MHz
HD:30MHz
AD
Converter
IC6501
I-P
Convert
IC8003
422
→
RGB
IC9000
Change Size
IC8502
γ
Process
On screen
IC9000
RGB
→
422
IC7501
"YU"
Parallel
→
serial
IC9403, 4
LPF
Video:8MHz
HD:30MHz
AD
Converter
IC6501
I-P
Convert
IC8003
422
→
RGB
IC9000
Change Size
IC8502
γ
Process
On screen
IC9000
Color/Tint
IC7501
"YU"
Parallel
→
serial
IC9403, 4
Summary of Contents for PlasmaSync 50MP1
Page 1: ...USE THIS SERVICE MANUAL WHEN SERVICING Model PLA 50V1 ...
Page 10: ...PlasmaSync Plasma Monitor User s Manual NEC Technologies ...
Page 64: ...TROUBLESHOOTING 4 1 ...
Page 80: ...METHOD OF ADJUSTMENTS 5 1 ...
Page 98: ...CIRCUIT DESCRIPTION 6 1 ...
Page 113: ...METHOD OF DISASSEMBLY 7 1 ...
Page 134: ...PACKAGING 8 1 ...
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Page 147: ...PART LIST 9 1 ...
Page 158: ...CONNECTION DIAGRAMS 10 1 ...
Page 160: ...BLOCK DIAGRAMS 11 1 ...
Page 163: ...SCHEMATIC DIAGRAMS 12 1 ...
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