Service ManualModel No.:4-2. Mainboard4-2-1. Function DescriptionProcess signal which incept from exterior equipment then translate into signal that panel candisplay.4-2-2. Connector denitionCN18CN614IR & Key InterfaceCN6Pin number Signal name1 5V2 RED3 GRE4 IR5 GND6 K07 K18 K29 K310 K411 K512 K613 K714 GNDSpeaker connector CN18Pin number Signal name1 ROUT+2 ROUT-3 LOUT-4 LOUT+48DR3505