User manual

Video Block

GP6DU and GPH6DU Chassis

The GPH6DU, and the GP6DU series plasma panels incorporate two tuners. The

main Digital Tuning System is used for primary picture operation. It provides

component and composite video and audio output signals from its ATSC, NTSC,

and QAM tuners. An additional NTSC sub-tuner provides a video output signal

(no audio) for use with multi-picture functions.

The composite output of the main tuner is connected to the NTSC input switch IC

on the H Board. The component output is connected to the main switch IC on the

H board. The unit also contains three video inputs that are also connected to the

input switch IC. The input switch IC selects one video signal from 5 video inputs

for main picture operation and another for sub-picture operation. Selection is

controlled by the MPU via the I

C Bus (SDA & SCL). These two outputs are then

connected to the main switch IC.

The panel also contains two component inputs and an HDMI input. The inputs

are connected to the main switch. The HDMI input connector on the DG Board,

accepts signals to HDMI receiver where it undergoes serial to parallel

conversion. The output of the receiver is then converted to “Y, Pb, Pr” component

signals before being applied to the Main switch. The MPU selects one of the 8

inputs for main picture operation and another for sub-picture operation.

On the DG- Board, the global core IC (GC2M) converts the composite video

signal of the main picture to RGB video signals. The GC2S IC processes the

sub-picture information and combines it with the main picture. It performs

interlace to progressive scan conversion. The Global core IC also converts the

horizontal frequency of all NTSC input-signals to 31.468KHz. The output of the

GC2M IC is RGB, which is applied to an RGB amplifier.

IC001 is the TV Main CPU. It generates the On-Screen Display (OSD) RGB

signals, which are applied to the RGB amplifier stage. A switching circuit

combines the two sets of RGB signals for display on the screen. All NTSC,

Component, and RGB picture adjustments such as picture, tint, color, brightness,

etc. are performed inside this IC.

The RGB/PC select circuit switches between PC and all other inputs. The output

of the switch is routed to the D-Board.