I am replacing an old back lit 16x2 LCD with a new one but there is a problem, the old one has 14 connectors and the new one has 16.
Unfortunately i can not find a spec sheet for the old one, so the question is:
Of the 16 connectors on the new one is there any which are not strictly needed?
Here is a link to the spec sheet of the new LCD:
http://www.maplin.co.uk/Media/PDFs/N27AZ.pdf
The 14 connectors on the old LCD come from a chip on the main board, these then connect to the controller but i can not work out what 1-12 do but i know 13 and 14 are for the back light.
Unfortunately i can not find a spec sheet for the old one, so the question is:
Of the 16 connectors on the new one is there any which are not strictly needed?
Here is a link to the spec sheet of the new LCD:
http://www.maplin.co.uk/Media/PDFs/N27AZ.pdf
The 14 connectors on the old LCD come from a chip on the main board, these then connect to the controller but i can not work out what 1-12 do but i know 13 and 14 are for the back light.
The 14 pins are pretty standard, although they can be arranged in single inline or dual inline. Things like backlighting and contrast vary from one model to another. Certain displays need a negative polarity on the contrast (usually only extended temperature range versions), and with backlighting, some displays need a series resistor to limit current, while others run directly off 5V. And some use EL (electroluminescent) backlighting which requires an AC drive voltage.
hmmmm, it didnt work, i spent a lot of tiem working on this and actually worked out quite a lot on how lcds work.
the new lcd with 14 lines plus 2 for the led work with 4-bit or 8-bit data, hence the ability to use just 10 of them or all 14 lines.
with my old one i have decided it uses 6-bit data though i can not find anything on the internet which would support this......
so basically nothing worked, not even the leds, i could not get it to work with any logical combination and i am not sure if i have done any irreversible damage to the control chip on the main board and i can not check as i managed to fry the conductive strip on the old lcd with my soldering iron..........
so im now playing the waiting game to either find a cheap broken box on ebay or get bored and fork out lots of money and get a new one from the origional manufacture and hope it all still works.
the new lcd with 14 lines plus 2 for the led work with 4-bit or 8-bit data, hence the ability to use just 10 of them or all 14 lines.
with my old one i have decided it uses 6-bit data though i can not find anything on the internet which would support this......
so basically nothing worked, not even the leds, i could not get it to work with any logical combination and i am not sure if i have done any irreversible damage to the control chip on the main board and i can not check as i managed to fry the conductive strip on the old lcd with my soldering iron..........
so im now playing the waiting game to either find a cheap broken box on ebay or get bored and fork out lots of money and get a new one from the origional manufacture and hope it all still works.
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