XOCECO LC-27W18S Service Manual - page 17
15
IC block diagram
1. Sound processing IC (MSP3410)
Sound signal send to sound processing N801 MSP3410, and dual-circuit tuner has second SIF, it
sends to N801 (stereo decode and auto volume control), N801 has audio channel switch, after
switching in N581 (HEF4052BT), the audio input of VGA/HDMI/YPbPr will be sent to N801 together
with the audio signal of TV and AV to do the switching process. A way signal thought volume and
high-low sound controlled, output the left and right audio send to digital audio amplifier N803
(TPA3008) amplify, then it send to speaker, other way signal output left-right audio send to
earphone amplifier N805 (NJW1109), after audio control and power amplifier, it output to earphone
socket. Other two ways signal output audio of TV out and AV out by SCART terminal of video board.
MSP3410 internal block diagram as follow:
Main pins instructions:
2, 3: SCL, SDA
27, 28: left-right audio of audio power amplification
36, 37: left-right audio of earphone
24, 25: left-right audio of AV OUT
33, 34: left-right audio of TV OUT
47, 48: left-right audio from main board
50, 51: left-right audio of SCART2
53, 54: left-right audio of SCART1
56, 57: left-right audio of AV IN
67, 69: SIF input of sub-channel and main-channel TV
59: MONO input of sub-channel TV