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Video Signal Flow - Philips FL9.1 Technical Training Manual

Lcd tv chassis for 2009
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Video Signal flow (Figure 3 & 4)
Figure 3
The composite and S-video inputs are located on the side jack panel. These signals are fed
to the the power supply on hard wired connecter CL701A. The one component input is locat-
ed on the power supply panel. All of these signals are fed to the Digital Main board via con-
nector CN302 on the power supply board.
Tuner TU301 tunes both analog and digital channels. The IF signal, DIF-OUT1 and DIF-
OUT2 is fed to the Digital Main board via connector CN302 on the power supply.
Figure 4
All of the system control, audio processing and video processing is performed by IC3301.
The component and AV inputs are fed to an internal switch and A/D converter. Tuner IF is fed
to an internal Demodulator and Digital processor.
The three HDMI inputs are fed to an internal HDMI switch and receiver.
Whatever signal is fed to IC3301, the IC rescales the video to fit the resolution of the screen
which in this case is 720p.
The signal is output from IC3301 in an LVDS format and then fed to IC3901.
IC3901 develops the drive signals for the LCD panel and is output using a RSDS format.
RSDS (Reduced Swing Differential Signaling) is a new format designed to drive LCD panels.
This format is designed to provide a higher data rate to newer thinner LCD panels. As with
LVDS, this format produces an offsetting positive and negative signal of approximately 200mv
to reduce RFI.
If the picture is distorted or has lines, check the RSDS signal from the Digital Main board to
the panel to determine where the problem is located.
This is the CPV signal which can be
checked on CN3902, pin 4.
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