temperature displays

ok.... also, how do I measure the voltage of the thermistor? When I set my DMM to DC and 2v, It stays around .020 -.027

Does that voltage change when the thermistor changes?Kevin Pierson

it does change, but it doesn't seem to be inline with the display. at about 30C, the voltage jumps around .020 and .024 when the temp is about 26C, its floating around .020 and .026 I cant help but feel i'm doing something wrong. How should the DMM be set? AC? DC? (I used DC)

measured against the ground, what precisely does that mean?

just two, black and red. so I had red to red and black to black.

I would probe from the units ground to the two wires and see if you get a voltage back on either one of them.Kevin Pierson

so that would be the black wire that provides ground to the unit itself right? the black wire(gound) on the molex thats powering the entire thing? This thing is a pain to take apart, its really weird. its like florescent display or something, and nothing will show up on the screen unless all the pieces are actually pushed together with some degree of force. Anyway if thats the correct way to test it, I'll do that. Should I use the 2v setting? or something else?

Ok, back to this, I still haven't purchased replacement displays since I burned the other two out, but I need to figure out how I'm going to do this as I have now almost completed my bezel with the holes for the displays in place of the vent. Here is the display all taken apart. Now how the hell does this thing work?? The LCD display has only the gauge line on it (GREEN/ YELLOW/red) and NO physical connection to the circuit board. As you can see it consists of the screen with a sheet of paper on the back, then a small "reflector" of sorts(the clear plastic piece with yellow wires) that has a small LED on the side, and does nothing more than light up. There is a piece of white paper to act as a reflector for the light, and then a small frame, and the circuit board sites on top of that. there is NO DISPLAY AT ALL if this is not squished together. if it isn't squeezed tightly together, the displays simply lights up, there are no numbers or anything other than the gauge line until you press it together. Here is the board, and the part that I fried. (The circled part with the bubble on it) This is the unit at each step of assembly. so how can we figure out what voltage is coming back from the temp probe (the long RED / black wires) and wire it up to an op-amp to control a relay?