Philips EM7U LCOS, Service Manual

Page: 26 / 104

FIGURE 29 - OVERALL BLOCK 1FH SECTION (Figure 29)
The inputs for the 1FH section are for NTSC signals only. The Side Jack panel can accept
either composite video or SVHS video. The Composite video or YC from the Side Jack Panel
is fed to the Jack Panel. Two Composite or SVHS inputs, AV1 and AV2 are located on the
Jack Panel. These inputs, along with the input from the Side Jack panel, are fed to the 7100
switch. IC 7100 selects between the three composite or SVHS inputs for output to the SSB
and PIP/DW boards via the System board. A Y Pb Pr 1FH input is also located on the Jack
Panel. This signal is converted from Y Pb Pr to YUV on the System board before being fed
to the SSB. This YUV signal is also fed to the PIP/DW panel. IF from the main Tuner, locat-
ed on the System board, is also fed to the SSB.
The HIP IC on the SSB selects between the internal Tuner video or selected video from the
Jack panel. If the signal is Composite video, it is fed to a 3D Comb filter panel for process-
ing. YC from the 3D Comb filter is fed back to the HIP. The HIP then outputs YUV to the
PIP/DW panel, which inserts the Picture in Picture or Split Screen when selected by the cus-
tomer. The Picture in Picture or Split Screen video is selected from the YUV signal, the
selected video from the Jack Panel switch, or the Tuner located on the PIP/DW panel. YUV
from the PIP/DW is then fed to the Feature Box, which performs the line doubling and zoom-
ing features. YUV from the Feature Box is then fed to the Eagle circuit, which enhances the
picture. The Pixel Plus feature is performed in the Eagle if the set is programmed for the
Pixel Plus feature. The YUV output from the Eagle is then fed to the LVDS transmitter before
being sent to the Scaler board. The video signal is digitized in the Feature Box and remains
digitized from that point on.
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SSB SMALL SIGNAL BOARD
MSB MAIN SCALER BOARD
JACK PANEL BOARD
JACK PANEL