My temp and gear select lcd is blank not completely blank but barely visible I plugged in another used one I found and still display is barely visible any ideas?
My temp and gear select lcd is blank not completely blank but barely visible I...
Im interested to learn about this as well...
sounds like it could be a loose or corroded power feed to the unit... I would start by cleaning the connections for the harness and sensors
LCD segments have an anode and cathode. One is supplied a pulsed information (usually a square wave pulse to 'excite' the liquid crystal segment) and the other one is a straight 'ground'. You can invert them and it still works. (switch from black on white, to white on black background) If you have 'information' displayed but its dim, then there is some resistance in the circuit to the display.
I use to buy a certain multimeter made by Fluke. It had a similar problem with the display. I would 're-seat' the LCD display in the socket and the main IC chip. It would always fix the problem. Could buy them cheap because they were 'broken' then flip them for $ Anyway, you have a very low power circuit that needs good clean connections to function properly. Take the advise of Tim and Mike and go through your connections..clean and re-seat them.
I troubleshot rail cars for the Washington Transit Authority (D.C.) for 27 years. I can tell you from a troubleshooting standpoint that you go (and grow) full circle during a lifetime of doing that. You start off wanting to be the ace troubleshooter..the 'glory boy' as we use to call each other..the guy that could find the problem nobody else could. Over time you realize that it is more important to 'normalize' the system you are working on BEFORE you even attempt to fix the problem. Know the system...fix/adjust everything that you know is wrong, and if you still have a problem; go after it. I fixed 'repeaters' for years..I had a good rep for doing so..fixing things that STAYED FIXED. It all starts with good ol' methodical adjusting and cleaning.
As far as connections are concerned, make use of 'erasers' in any form. Pencil erasers, of all shapes and sizes; have a mild abrasive molded into the rubber. Used caringly, they can do a great job cleaning tarnished connections. And don't fall prey hearing things like gold connectors don't 'tarnish'. I taught myself to fix radios and televisions in my early teens. I've seen my share of failed gold on gold connections. While gold may not tarnish, it is still subject to microcrap 'growing' on it. (Think of barnacles on a boat) The more sensitive (low power) the circuit - like yours - the more ANY little resistance can affect it. Clean it up..:)