The processor card must have the TXT/GPX jumper put on for GPX. This display works with processor 08BSPE2T and later. The GPX symbol stands for the Graphics Display panel.

When the machine powers up and 12 volts DC is available to the display board, the display will actually show 2 horizontal bars, one at the top and one at the bottom. If there are no horizontal bars displayed then there is either no power or the backlight is not working.

You will probably not see anything on the display if the back light is not working.

The display assembly is made of 3 parts, the Flat panel, the driver board and the 485 to 232 converter board (AT3 board).

The AT3 board has an inverter on it to convert 12VDC to about 300 VAC. This is what makes the display light up. It will probably light you up too, if you touch the wrong terminals.

There is a 2 pin connector that supplies the 300VAC to the Flat Panel. You can measure this value with an AC voltmeter.

The inverter that converts the 12vdc to 300 VAC is the same size as a stack of 3 dominos. A couple have failed as of 070206. If this is the case the AT3 board can be replaced alone and make the display work again. SO measure the input at 12VDC and if no output is measured at 300VAC then the inverter is bad.

The few voltage checks may prove a 12VDC supply issue rather than a display board failure.

GLL 070506