Panasonic LX600 Technical Information

Also see for Lx-600: Tuner firmware installation instructions Operating instructions

Contents

Panasonic LX600 Technical Information Manual pdf 10 page image

10Power On Sequence1.The Standby 7V (STB_7V) is generated on the P board (non- serviceable) when AC poweris applied. This can be measured on Pin 3 of Connector AP4/A4.2.The STB_7V is regulated to 3.3 V on the Main board and applied to the Main Video andAudio Controller IC4002.3.Power on command by the remote control is not possible until the main power switch isactivated. When the Main Power Switch (AP Board) is activated, a active low ALL_OFFsignal is provided to the base of Q1151 via pin 7 of the connector AP4/A4. As a resultQ1151 turns on and a low is applied to the Key Scan Power input pin of IC4002. Thiscauses the unit to turn on, display a raster and become fully operational. The remotecontrol commands are now received and processed by the main unit. To continuehaving full access via the remote control, the unit must be powered off by the remotecontrol, not by the power switch located on the main unit.4.The Sub-On signal is issued by IC4002 on pin 8 of connector AP4. This signal isresponsible for pulling the contacts on the AC relay on the Power Board.5.The Main_On signal is issued by IC4002 and provided to the AP board via pin 6 ofconnector AP4/A4. It enables the Main 9V, Main 5V, and the Sound 18V (Not Shown inthe diagram) secondary power sources of the AP board. The Main_On signal is alsoresponsible for enabling the Main 3.3V regulator needed to power IC4004.6.IC4004 provides the Panel_On signal that enables the Panel 12V regulator on the APboard. It also provides the Inverter_On signal that enables the DC to AC invertercircuitry on the LCD Panel.7.The Inverter PWM signal and Current signal control the output voltage of the DC to ACinverters that is used to power the CCFLTs. Increasing the on time of the INV_PWMsignal, which can be seen on pin 5 of connector A5, will increase the brightness of thebacklighting on the LCD Panel.8.The INV_SOS signal is issued by the logic that resides on the LCD Panel if there is aproblem with the panel of inverter power supply.