lcd display - Page 1
Forum section: electronics / beginners

author: jipaionutcatalin
author_rank: Newbie
timestamp: October 24, 2015, 03:07:21 pm
content: HyI got several of this lcd display,see the photos,and I have no idea how to power on or how to use it.Been reserching the web and nothing so far.Can anybody give me a hand with this?.THanks in advance.

author: Cliff Matthews
author_rank: Unknown
timestamp: October 24, 2015, 04:00:18 pm
content: I Googled "powertip lcd 24-pin" and lot came up. You can take some lucky cues from the way "PowerTip" does its other boards. Take off the two screws and you will be able to identify the 12 wires belonging to the switches and IR, and the other 14 (typical for Hitachi type displays) pertain to the display controller. Also, post a pic of the other side.. edit: Oops, 3rd pic is the one I needed, but the other poster hit the nail on the head nicelyand BTW, welcome to the forum!

author: mariush
author_rank: Super Contributor
timestamp: October 24, 2015, 04:10:02 pm
content: The LCD is pretty much standard, clone of those HD4... displays. Attaching the datasheet with the pinout for another display, which is pretty much the same with most of these LCD displays. See page 11.So the first few pins I would guess would be in the same order as most of the other displays out there, then you would have one pin for each button ( i guess it's 0v when not pushed, 5v when button pressed or something like that), one or two wires for the infrared sensor (the part labeled IR in third picture) , a couple of pins maybe for the speaker or whatever is there in the right corner of the unit in 2nd picture) and so so.You can figure out the purpose of lots of those pins in the header using a multimeter set in continuity mode. Start by figuring which pin is Ground, because the majority of standalone lcd displays have the first input pin as ground, as you can see on page 11. Put one probe of your meter on the negative side of a capacitor (C6 seems like a good choice) and the other on the first few pins in the header, and you'll figure out the ground. Probe on the positive of the capacitor and another pin header will give you input voltage.Near the large A and K by the header are two thicker pins, those are the pins for the LCD backlight. A is anode and should be 5v (or some input voltage, it could be any voltage since leds are current driven so as long as there's a resistor to limit current they're good), so the if you touch that pin with one probe the meter will beep when you touch the corresponding pin in the header. The cathode K goes to that small R8 resistor (in third picture) and then you can see the trace going to that header pin. From the same A pin you can see a trace going to TP5/J1 and then it continues to the top side of the picture where power goes through one resistor for each small led on the other side of the board (R14, R15, R16) etc...Same with the buttons, put one probe on one side of the push button and the other probe touch pins in the header until you figure out where is that button connected to in the header. One side of the push buttons should be connected to input voltage or ground, the other side to header pin.

author: jipaionutcatalin
author_rank: Newbie
timestamp: October 25, 2015, 09:43:57 am
content: thanks guys big help