The display on our "treadmill running machine" has stopped displaying graphics and I need some help to troubleshoot before eventually buying an new display.
I would really like to find out whether its the display thats mailfunctioning or any circuit before the display connector. (the programs seems to be functioning, but nothing shows in the display).
I have found the following connection table for the "Sharp LM32P07" display:
Does anyone know if its possible to use any standard interfaces on an laptop or workstation computer to test the graphics functions on the display? Or any other ideas?
Try this first to test the backlight.
Darken room and hold a small torch close to the screen.
If you can see the graphics then the screen is ok but the backlight has failed.
Come back with results.
Its a "Quinton" treadmill.
MeatPie: I tried your tip but I saw nothing. The fact is that i tried with and without connecting the backlight connectors. But no graphics.
As a matter of fact, the backlight went out as I troubleshooted as suggested. I connected it while the treadmill was on, and the backlight worked at first, but the second time it just went dead.
It can be very difficult to see what's on the screen without the backlight. You'll have to move the torch around. Hold it right against the screen.
You'll need to get some light into that screen somehow to see if it actually has graphics on it. Try removing one of the backlights from the screen and shine a torch into where you removed it from. In computer monitor size lcd's they slide out.
You could make a tester as follows.
Buy a ccfl light like this one : **broken link removed**
Cut half way along the wires that go to the 2 lamps. Make sure you tape them as pairs. Now you have 2 testers.
Disconnect the LM32P07 backlight connector.
Strip the ends from the tester inverter and poke them into the display backlight connector.
Connect an external 12volt supply to the tester. Be aware that backlights are very high voltage so keep away when you switch it on.