LG 37LF11 Owner's Manual (English) - Page 15
RS-232C IN CONTROL & SERVICE PORT, Analog PC Connection. Uses a D-sub 15 pin cable
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PREPARATION 1 USB IN SERVICE ONLY Used for software updates. 2 AV (Audio/Video) IN Analog composite connection. Supports standard definition video only (480i). 3 HDMI/DVI IN, HDMI IN Digital Connection. Supports HD video and Digital audio. Doesn't support 480i. Accepts DVI video using an adapter or HDMI to DVI cable (not included). 4 RGB IN (PC) Analog PC Connection. Uses a D-sub 15 pin cable (VGA cable). AUDIO IN (RGB/DVI) 1/8" (0.32 cm) headphone jack for analog PC audio input. 5 OPTICAL DIGITAL AUDIO OUT (Except 19/22LH20, 22LH200C) Digital optical audio output for use with amps and home theater systems. Note: In standby mode, this port doesn't work. 6 ANTENNA/CABLE IN Connect over-the air signals to this jack. Connect cable signals to this jack. 7 RS-232C IN (CONTROL & SERVICE) PORT Used by third party devices. This port is used for Service or Hotel mode. 8 COMPONENT IN Analog Connection. Supports HD. Uses a red, green, and blue cable for video & red and white for audio. 9 Power Cord Socket For operation with AC power. Caution: Never attempt to operate the TV on DC power. 15