Go Down

Topic: breaking a 2x16 lcd display (Read 2 times) previous topic - next topic

Schwabinger

Hello,

in my radio project I use a 2x16 lcd display.


SlugRadio by RigasW, on Flickr

The opening in my radio case is rather tight for the display. So I had to press quite a bit to get it in.

After several repetitions of builing it in and getting it out now the display suddenly only shows some black squares on the right side of the second line.

I never thought about it but: How sensitive are those dispays? Are they easy to break?

Bevor I will build in the replacement, I certainly will make the opening a little wider  :smiley-red:

Schwabinger

P18F4550

Through experience i have found lcd's to be quite robust, maybe opening and closing the lid has dislodged a wire inside your box?
if and lcd is damaged or the glass is cracked you will normally see black marks on the screen even when the power is off

wossname

I've broken one of these before, and I saw what I'd describe as a puddle of black "ink" in the fractured area.  Quite demoralising really.  On the bright side they are (as complex components go) pretty cheap and simple to interface with.  I haven't used many but I tend to keep a spare one around for situations such as this.

It didn't take much force to damage it, when I broke mine I think it was from a blunt (but fairly mild) impact on the front glass.  Twisting through the long axis would very probably break the screen too, but this is a lot less likely unless you're mounting it in a flimsy enclosure.

Swap it out and solder in a new one and good luck with your project.  It looks pretty awesome, I have to say!

liudr

If the LCD didn't crack, then maybe the conducting rubber is disledged. Look at the following diagram


You can use a small screw driver to straighten the rubber. That helps a little. If not, you can risk taking off the display panel from the circuit board, re-place the rubber to the right place, then tighten the glass panel back on.

Schwabinger

Thanks for your answers!

I soldered in a new display yesterday.
Now everything works again.

Schwabinger

liudr

Good for you. Say, what tool did you use to cut the LCD window? I have a similar project in mind that needs a wooden box. I could get some tips from you :)

wossname

Normal procedure for cutting clean rectangles into wood is to drill a large hole well inside the perimeter of the rectangle and inserting a coping saw blade to cut the rough shape out, then you sand / file it down to perfect the shape.

Schwabinger

I did exactely as wossname advised. I drilled a hole and then used a jigssaw.

Schwabinger

Schwabinger

Well ... I am on the way to get the next 2x16 ...

because the other day when I was opening my radio suddenly the lcd got very hot.
And now on one row from left to right it does not show any black parts of characters any more.
That means that the first of the two lines is hard to read now.

I suppose I had a short circuit between two pins for a short time ...
Can someone tell me which pins of the lcd may never ever get in contact ....

Or has the kind of 10k trim-pot that I use an influence?

Thanks in advance,

Schwabinger

liudr

In short, no pins want to touch no other pins. But to find problems, open the box and snap a few photos. We'll take a look. Maybe it was the spaghetti monster  :)

Schwabinger

It certainly was the spaghetti-Monster ...
I got some heat-shrink the other day and start to fight the monster now ...

When everything is built in again I will take a picture of the display.

Schwabinger

liudr

Seems like I can offer some advice against the spaghetti monster as I fought mine a while back. I've done two ways to win my fight:
1) Use an old-fashion hard drive cable to connect my display so the loose jumper wires or else are minimized in length and manageable


2) I made my own shields, starting with this simple one:


Then this one:


Schwabinger

Wow ... you really killed the monster!
My first approach will be heat-shrink ...

Schwabinger

Schwabinger

I donĀ“t understand that: When I came home from work today the lcd was dark. I opened the box and the lcd-modul was hot on the inner side.

I switched arduino off, waited half an hour and .... now the display works again flawlessly! No missing lines ... everything is fine ...

I wish I would understand why ...

Schwabinger

liudr

Did you not have a current-limiting resistor on the LCD back light LCD? That's what could have heated up your display. When heated up, the liquid crystals will boil into liquid and permanently lose their alignment and the display will degrade. You'll have to show your monster so we can troubleshoot!

Go Up