- Is the 24V being supplied to the inverters from SMPS? [CN1/CN501 pins-1-5].
- Is the inverter On Command arriving at both inverters? [CN 1/CN 501 pin-12] [ Main to SMPS P-201 pin-20].
- Disconnect the ribbon cables from the T-Con board to the inverters. If back light turns ON, could be a T-Con problem.
1/2 THE PANEL WON'T LIGHT
- Confirm steps 1 & 2 above for the particular inverter involved.
- Disconnect the ribbon cable from the T-Con board going to the particular inverter involved, could be a T-Con problem [CN8/CN9]
SECTIONS OF 1/2 THE PANEL WON'T LIGHT
- Locating the connection corralling that particular section should be easy. Just compare the section that is out and align with the particular cable.
- Looking at the connector going to the LED back lights, look at the bottom 2 pins on 'M' inverter or the top of 2 pins of the 'S' inverter, check for 39V? If missing, unplug the connector and recheck. Still missing?
- Using the interconnect diagram, locate the fuse protecting the 24V to the DC to DC converter that is developing the 39V for that connector. If found open, replace the inverter.
- Be sure to test the back light LEDs that attach to that connector for shorted condition. With the connector unplugged put the Red lead on the the bottom 2 pins on the 'M' inverter or top 2 pins of the 'S' driver, and the Black lead on any other 8 pins. All should read 'open'. Or, apply 30-38V on the bottom 2 pins on the "M" inverter or top 2 pins of "S" inverter, and the ( - ) lead to any of the other 8 pins while observing that section of the panel, the LEDs should illuminate across the screen in the section controlled by that plug.
ENTIRE PANEL BACK LIGHTS ARE DIM
- Disconnect the ribbon cables from the T-Con PWB to the inverters, could be a T-Con problem [CN8/CN9]
