LG LST-5600A Service Manual page 35

5. NO ATSC AUDIO
2) CHECK MSP4448G AND SURROUNDINGS
5V is supplied to IC701(10, 16, 49, 63)?
YES
8V is supplied to IC701(31)?
YES
18.432MHz Clock is input to IC701(54,
55)?
YES
Data pulse is input to IC701(6)?
YES
48kHz clock is input to IC701(4)?
YES
Analog audio is output from IC701
(28, 29)? Fig.04
Fig.04
Analog audio output
NO
NO
NO
NO
NO
NO
3-31
Check Power Supply Part
12V is supplied to IC703(1)?
NO
Check Power Supply Part
Check X701
Check IC400
Check IC702 and surroundings