FORM 50.40-OM2

DISPLAY BACKLIGHT INVERTER BOARD

(REFER TO FIG. 44)

The Display Backlight Inverter Board generates a high voltage AC signal that is applied to the backlight lamp, causing it to illuminate. The magnitude of the signal determines the lamp brightness. Displays by some manufacturers have two lamps; one at the top and one at the bottom of the display. Other Display manufacturers have only a lamp at the top of the display.

An Inverter converts low level DC voltage (+12VDC or +5VDC, as required by the manufacturer) from the Microboard to a 500 to 1500VAC 60KHz signal that is applied to the lamp. The higher the AC voltage, the greater the brightness of the lamp. When this voltage is not present, the lamp is turned off.

High voltage, up to 1500VAC, is pres- ent at the output of the backlight inverter board. Refer to Figure 44 and locate the output connectors. Use extreme caution when working in this area!!!

Different Display manufacturers require different Backlight Inverter Boards. The different board designs require different control voltage inputs. To accommodate these variations, Microboard Program Jumpers JP3 - JP5, JP7 and JP8 must be configured to provide the required voltage levels. A label attached to the Display mounting plate lists the required Program Jumper configuration for that particular display. Refer to Table 2 for required Program Jumper configurations for the various Display applications.

Under Program control, the Microboard generates the control signals that are applied to the Backlight Inverter Board. The Program determines when the lamp is turned on and off. It also adjusts the lamp brightness. To increase the average lamp life of 25000 hours, the lamp brightness is normally adjusted to 50%. This brightness level will still allow the display to be visible. When the Program senses a Keypad key has been pressed, it adjusts the brightness to 100% (maximum).

The lamp illumination high voltage AC is generated from either +12VDC or +5VDC as required by the manufacturer. Microboard Program Jumper JP5 must be positioned to provide the required voltage. The Microboard provides the Backlight Enable signal. This signal turns the lamp on and off. Some manufacturers require this signal to be +12VDC, others require +5VDC.

Program Jumper JP4 must be positioned to provide the required voltage. Further, some applications require this signal to be a +VDC (+12VDC or +5VDC) to turn on the lamp. Others require this signal to be 0VDC to turn on the lamp. Program Jumper JP3 must be positioned to provide the required polarity.

Depending upon the Display manufacturer, the brightness control input from the Microboard must be either a variable voltage or a variable resistance. Microboard Program Jumpers JP7 and JP8 are used to provide the appropriate technique (refer to Fig. 34). The lamp dimmer circuit on the Microboard is an IC that is the electrical equivalent of a 10K ohm potentiometer with 100 positions or steps. The Program adjusts the position of the potentiometer. When configured for variable voltage (JP7 & JP8 installed), the output between Microboard J6-7 and J6-8 is a 0 to +5.0VDC signal. Not all applications require the full 5.0VDC range. If configured for variable resistance (JP7 and JP8 removed), the output between Microboard J6-7 and J6-8 is a 0 to 10K ohm variable resistance.

The OptiView Remote Control Center could be supplied with any of several approved Displays. Each Display requires a specific Backlight Inverter Board. This board is available as a service replacement part (the required Backlight Inverter Board part number is listed on the label attached to the Display mounting plate). However, service replacement Displays are provided in a kit (YORK P/N 331-02053-000) that includes the appropriate Backlight Inverter Board (refer to “Liquid Crystal Display” description).

SHARP model LQ10D367 and LG Semicon LP104V2

5

display requires a TDK CXA-LO612-VJL Backlight Inverter Board (YORK P/N 031-01789-000) (ref. Fig. 39 and Fig. 40). These boards generate a lamp illumination high voltage AC from +12VDC. When the Backlight Enable signal at connector CN1-3 is +5VDC, the high voltage signal is applied to the lamp. When CN1-3 is 0VDC, the high voltage signal is removed from the lamp, turning it off. The lamp brightness is controlled by a variable voltage signal, developed by the lamp dimmer circuit (ref. Fig. 34) on the Microboard and applied to connector CN1-4. The lamp dimmer circuit varies the voltage at CN1-4 over the range of 0 to +3.0VDC. 0VDC produces maximum (100%) brightness; +3.0VDC produces minimum (0%) brightness. Voltages between these values produce a linear brightness 0 and 100%. Connector CN2 applies the high voltage lamp illumination signal to the lamp.

YORK INTERNATIONAL

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York 00497VIP manual Display Backlight Inverter Board
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00497VIP specifications

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