LCD DV 42LH90
41
February 2010
INVERTER (LED BACKLIGHTS) SECTION
INVERTER (LED BACKLIGHTS) SECTION
The Inverter receives 24V from the SMPS on CN1 pins 1~5..
The Inverter On (INV ON) command from CN1 pin 12 starts
the Inverter drive signals.
P-DIM is delivered from the Main board through the SMPS to
the Inverter on CN1 pin 13.
The Inverter is responsible for delivering B+ (27.5V) to each of
the 64 LED Blocks. This is accomplished by 4 DC to DC
Converters (M1~M4) on the board, (easily identified by the 4
yellow capacitors on the lower left of the board.
• M1 and M3 are routed out CN4
• M2 and M4 are routed out CN3.
It also must deliver grounding pulses (Drive Signals) to each
of the 64 LED Blocks. This is accomplished by the 32
switching components Q19~Q50 each controlling 2 blocks.
The Left hand connector CN3 connects the 4 LED Boards
(32 blocks) on the right side of the screen and the Right hand
connector CN4 connects to the 4 LED Boards (32 blocks) on
the left.
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