42LW5500-ZE, 42LW550T-ZE, 42LW550W-ZE, 42LW551C-ZE, 42LW5590-ZE (CHASSIS:LD12C) - LG TV Service Manual (repair manual). Page 51

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LD12C Main PCB for Broadband
To PSU
1
2
3
4
1
Main processor, DDR Memory
Flash Memory
2
3
4
Micom for Key/IR sensing 
HDMI switch (4:1)
Audio AMP (10W+10W)
XXLW5500/T/W/S-ZA
XXLW650W/G/S-ZA
XXLW570G/S-ZA
Soft touch +IR
Front Spk
To T-CON 
BOARD
5
5
URSA5 External FRC
0/T/W 
model
G/S 
model
2
1
LNB IC 
Only G/S model
1
2
Main Board without T-con b’d
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