Audio Circuit; No Atsc Audio - LG LST-3100A Service Manual

2. AUDIO CIRCUIT

1) NO ATSC AUDIO

(1) Check IC110 and Surroundings
5V is supplied to IC110(14)?
YES
12.2880MHz clock is input to IC110
(5)? Fig. 01
YES
48KHz clock is output from IC110
(4)? Fig. 02
YES
IC110(13) is grounded?
YES
Data Signal is input to IC110(2)?
Fig. 03
YES
Analog Audio Signal from IC110
(12,15)? Fig. 04
NO
Check the Power Supply Part.
NO
Check 12.2880MHz Clock output at
IC200(H5).
NO
Check 48KHz Clock ouput at IC200
(G5)
NO
NO
Check Data Signal at IC200(G3)
3-7
Check soldering.