Inverter (Led Backlights) Section - LG Infinia 47LE8500 Manual

INVERTER (LED BACKLIGHTS) SECTION

INVERTER (LED BACKLIGHTS) SECTION
The Inverter (Main) receives 24V from the SMPS on CN1 pins 1~5 and Inverter (Secondary) receives
24V on CN101 pins 1~5. The Inverter On (INV ON) command arriving on CN1 or CN101 pin 12 starts
the Inverter drive signals, (120Hz).
P-DIM is delivered from the Main board through the SMPS to the Inverter on CN1 or CN101 pin 11.
The Inverters are responsible for delivering B+ approx. 13V to each of the 216 LED Blocks. This is
accomplished by 3 DC to DC Converters, 2 on Inverter (Main) and 1 on Inverter (Secondary)
Inverter (Main) 13V
• U101, Q4, Q5, L101 and C75, out CN2 and CN3.
• U102, Q7, Q8, L102 and C89, out CN4 and CN5.
Inverter (Secondary) 13V
• U101, Q105, Q106, L206 and C151, out CN104 and CN105.
The Inverters must also deliver grounding pulses (Drive Signals) to each of the 216 LED Blocks.
This is accomplished by the 15 switching components, 10 on Inverter (Main) U3~U11 and U13
and 5 on Inverter (Secondary) U2~U5 and U13.
Inverter (Main) has 4 Connectors CN2~CN5 that connect to Extensions boards. The Left hand
Extension board (as viewed from the rear) connects to CN2 and CN3 and the Center Extension
board connects to CN4 and CN5.
Inverter (Secondary) has 2 Connectors CN104~CN105 that connect to the right hand Extension
board (as viewed from the rear) which connects to CN23 and CN24.
Each Extension board has 9 connections to the Backlight LEDs.
There are 4 LEDs per/block, 216 Blocks, 8 Blocks per/cartridge, 3 Cartridges per/bar, 9 bars
(rows), 32 LEDs per/cartridge, 96 LEDs per/bar. With a total of 864 LEDs.
July 2010 LCD TV
48
47LE8500