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Audio Signal Flow - Philips FL9.1 Technical Training Manual

Lcd tv chassis for 2009
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The waveform to the right is the POL signal on
CN3902, pin 5.
The waveform to the right is the TP signal on CN3902,
pin 6.
The waveform to the right is typical of the ones carrying
the picture information.
This signal is measured on pin 8 of CN3902. Similar
signals are present on pins 9, 10, 11, 12, 13, 15, 16, 18,
19, 20, 21, 22 and 23.
Audio Signal Flow (Figure 5)
AV audio from the side jack panel is fed to the power supply via connector CL701A. The AV
audio inputs are all located on the power supply board. The audio input is selected by IC771
which is controlled by the INPUT1 and INPUT0 lines from the microprocessor. Selected
audio is fed to the Digital Main board via connector CN302 on the power supply board.
Digital and analog tuner audio is processed by the signal processor on the digital main board.
Selected audio from the processor on the digital main board is fed to IC3803 and then to two
D/A converters, IC3802 and IC3801 and then to the power supply board via connector CN301
on the power supply.
Audio is then fed to the audio amplifier, IC801, and then to the speakers.
Monitor analog audio is buffered by IC871 before being fed to the left and right audio outputs.
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