LAMP DRIVE ERROR [5X] (AKA LAMP POWER SUPPLY BLOCK) {5 Blinks}
Five flash pattern; Lamp Driver.
This error indicates loss of 12KV High Voltage Output (Lamp ignition Voltage) from the Lamp Driver Board. The main objective when troubleshooting this error is to isolate to one of four areas.
- The Lamp.
- The Main Power Supply [G-Board]
- The Lamp Driver Board [Lamp power supply block]
- The TV microprocessor [ASU-Board].
A completely open circuited lamp can cause a 5X flash pattern. Therefore the very first component to eliminate from the suspect is the 'Lamp'.
Does the Spark Gap light? 3 attempts 20 seconds intervals.
Visually check the spark gap on the Lamp Driver board for illumination during TV initial power-on process. In normal operation the spark gap will flash approximately 5 seconds after the ON button is pressed, and the green LED begins flashing. It should flash once and the Lamp will Light.
If the spark gap flashes three times with a 20 second pause in between flashes, the Lamp Drive is functioning properly, and the Lamp is defective. Replace the Lamp.
If the spark gap does not illuminate, then the next step is to check the [380V] lamp driver supply [G-Board]. Measure this voltage directly at Lamp Driver Board at the (X1) connector at the top of the board. If this [380V] is missing, the power supply [G-Board] is defective. Replace the G-board.
If (380V) is present then the next step is to check Lamp-On Control Voltage from the TV microprocessor [ASU-Board]. Measure this control voltage at CN2390/pin 4 on the ASU board. The voltage should initially be at [3.3V] while the Green LED is flashing, and then go low to approximately [0.13V], when the Green LED glows steady.
If the Lamp-On control voltage transitions from 3.3 to 0.13V properly, then the TV microprocessor is instructing the Lamp Driver to Turn-On. At this point the Lamp Driver is receiving its 380V supply voltage and its Lamp-On voltage, however, the lamp driver does not function {No spark gap}. In this case replace the Lamp Driver Board.
If the Lamp-On voltage does not go low [0.13V], then the problem is with the TV microprocessor, replace the ASU | DSU assembly.
