When replacing inverters, first
replace the board(s), and then test the unit. If the TV still does not work,
replace the inverter cable(s). Inverters are spared as a pair (except for the
32-inch model), so you should replace both. The inverters are NOT the same –
there is a Master and a Slave. If you are facing the back of the unit, the
Master inverter is on the left side above the speaker marked L (for left).
When plugging inverter cables
into the power supply, the Master inverter cable outboard and the Slave cable
is inboard. You have to remove the main bracket, but do not have to remove the
power supply or main board to remove the inverters.
Note: Inverter board cabling
differs based on model.
LT-3200 INVERTER REMOVAL: [Model LT3200 has only one
inverter.]
- Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and out of the unit.
- Disconnect the six cables from the connectors on the rear of the inverter board and the remaining cable from the connector on the front of the board. The connectors have a catch you must push down before removing the cable.
- Lift the inverter board up and off the unit.
LT-3700 INVERTER REMOVAL
The 37-inch model has different
sized inverters, as well as an additional flat ribbon cable from the inverter
to the control board.
- Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and out of the unit.
- Disconnect the cables from the connectors on the inverter board.
- 4 total cables on Master. 3 total cables on Slave.
- To disconnect fragile flat ribbon cables, disconnect all other cables, grasp the end of the flat ribbon cable, and then pull the board away from the cable.
- To disconnect the cables, grasp both sides of the cable near the connector, and then pull the cable straight out of the connector.
MASTER INVERTER
SLAVE INVERTER
- Lift the inverter board up and off the unit.
LT 4200 INVERTER REMOVAL
- Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and off the unit.
- Disconnect the 10 cables from the connectors on the rear of the inverter board, and the remaining cables from the connectors on each side of the board. Grasp both sides of the cable connector and pull it straight from the connector on the board.
- Lift the inverter board up and off the unit.
LT-4700 INVERTER REMOVAL
- Remove the six screws that secure the inverter cover to the unit, and then lift the cover up and off the unit.
- Disconnect the 15 cables from the connectors on the rear of the inverter board, and the remaining three cables from the connectors on each side of the board. 15 total cables on each board – 12 on back of board, 1 on each side. Pull the blue tabs straight out to disconnect the cables.
- Lift the inverter board up and off the unit.
