Para o chassis EX1 (são 13 e não 14)
Balancer Error (13X)This protect feature is not utilized in the models using the 32 and 37-inch panels although it appears in the diagnostics screen. Only models that use balancer boards have this feature.If one or more of the backlight lamps fails to light, the balancer loop will cause the BAL_ERR line at pin 1 of CN1410 to go low from its normally high state (11.5VDC). In virtually all cases you will see the backlights turn on before the unit shuts down. Once a balancer error is detected the unit turns off and blinks the standby LED in groups of 13. Unlike the inverter error detection, the unit will not make another attempt once it shuts down.This event is most likely caused by a defective lamp. In the models that use 52-inch panels it is possible that one of the 2 inverter boards has failed and can be detected by one side of the screen appearing slightly darker during the brief period before shutdown.
Balancer Errors When a balancer error occurs, we at least have the ability to observe the lighting of the lamps before the unit shuts down. The unit must a have a correctly functioning inverter to start the lamps and allow the balancer detect circuit to function. In some cases, the lamps may light long enough to see active video or snow for a couple of seconds. Observing the backlighting of the panel at this time is a great tool in determining what is causing the shutdown. NOTE: Unlike an inverter error where the unit will make 3 attempts to start the inverter, a blanacer error will cause the unit to cycle 2 times before the protect shutdown occurs.Remember, the purpose of the balancer detect circuit is to monitor a lamp that will not startup. Unless a particular model has a history of a related component causing balancer error shutdowns to occur, it will usually be a defective lamp and that will require replacement of the entire LCD panel. A lamp that is not lighting is difficult to spot due to the efficiency of the diffuser panel to spread the light.In models that use inverter boards on both sides, observe the screen for uneven lighting from one side to another. This indicates a faulty inverter board and the side that is darkest is where the failed inverter resides.
Inverter Error (6X)Entering the BU board at pin 3 of CN1401, the inverter error line is normally low. This line goes high whenever the inverter loses one or both of the AC lamp drive outputs. This may occur because of a failure of the inverter or when the inverter is stopped because the OCP or OVP circuits on the inverter board have detected a problem.If IC3001 detects a high on the inverter error line the unit will make 3 attempts to get the inverter to start running. In almost all cases, the backlights will never light. The exception to this is if the inverter is starting but it’s over or under-voltage circuits are stopping it. During this cycle time the clicking of the main relay will be heard as the unit turns on and off. If the unit was last set to an input with active audio you may hear this for a moment.
Veja se o diagrama base ajuda, existem vários esquemas do chassis EX1, alguns têm o esquema completo
Verifique o conector CN6706 pino LD-6
