LG 26LH1DC1-UB Service Manual page 35

2. Digital RF(ATSC, QAM) Audio signal flow chart
RF Signal Input
(ATSC/QAM)
The digital RF signal(ATSC/QAM) received in the input terminal of the tuner is converted to the base band signal in
the tuner(IC105) to send out 8 bit transport stream.
This signal includes both the video and audio signal. The audio received by the DTV controller through IC901 is
decoded for Dolby AC3 in the audio decoder and the PCM data is transferred in I
This signal is converted to stereo signal(L/R) from the digital audio amp(IC708) and then sent to the internal speaker
through audio output connector(P706, P707).
Also for the digital audio data in IC401, the PCM or AC3 compressed data by user setting is sent out in SPDIF
format through P501.
Copyright©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Speaker
*Tuner(ATSC/QAM) Audio signal flowchart
IC105
TUNER
TS Data
IC901
ALTERA FPGA
Unscrambled
TS Data
IC401 IEC958
DTV Controller
2
I S
IC708
Digital Audio Amp.
Stereo(L/R)
P706, P707
Audio Output
Connector
-35-
P501
SPDIF Output
Connector
S format.
2
LGE Internal Use Only