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42PC5D-UL (CHASSIS:PA75C) - LG TV Service Manual (repair manual). Page 17

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BLOCK DIAGRAM
Block Diagram 
Power Sequence and Flow Diagram
ST_5V
ST_5V
REG
IC
BIAS
Side power
Local key/IR power
IC202
ICL3232
RS-232C RX/TX
IC404
AZ1117H-3.3
IC406
AT24C16AN
(EEPROM)
+3.3VST_MICOM
IC407
MTV416GMF
(
micom
)
BIAS
HDMI CEC
Inv/RL/live-on
3.3V->5V
BIAS
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