[HELP] LCD Nokia 1100 - PCF8814

Using Arduino Displays
1

Hi, people!

I need your help, folks. I bought a lot of tech garbage. Some LCD from Nokia 1100. The thing is that I wired one of them to an Arduino Uno, without resistors:

  • 3.3 volts out from Arduino to a breadboard, and the LED+, VDD and VDDI pads directly. Of course, also the GROUND pad.
  • SCLK, SDA, CS and RES pads to corresponding Arduino's pins.

E1CDD442-D5EE-48EC-936B-2028D31A3864
E1CDD442-D5EE-48EC-936B-2028D31A38643024×4032 2.76 MB

I insist, with no resistors of any kind. Arduino to notebook via USB and pins as I said above.

With a 8 pads LCD from Nokia 1100, it works with no problems. (Tested it in two).

But, with the version of 9 pads, also from Nokia 1100, I got the LED on, but no characters. Nothing on the screen.

With the multimeter, I checked the voltage. And get:

  • Around 3.3 volts, of course, in LED+, VDD and VDI.
  • Pads SCLK and SDA a variation of 0.1 or 0.3 volts.
  • Pads CS and RES with around 5 volts.

So, finally, the question is:

Is there a difference between the 8 pads and 9 pads versions of the Nokia 1100 LCD?

Why the 8 pads working fine without resistors but the 9 pad version doesn't?

Is there a way to check if the screen is damaged?

I have a DSO138 oscilloscope.

Thanks!

2

Please post links to the actual displays that you have bought. e.g. Ebay sale pages.

We need to identify which boards you are using from photos of the pcb.
If they are bare panels we need to see the flexi-ribbon cable and any ZIF or soldered connections.

David.

3

Hi, David!

Not a lot of info about the displays. Nokia 1100 or Nokia 1108B (I guess the last one it's a latinoamerican version). No text on the flex or anything like that.

7092A355-C0FB-4132-BFC7-788521118497
7092A355-C0FB-4132-BFC7-7885211184973024×4032 2.8 MB

54E26442-3FC1-490A-B505-F0593CDE5E71
54E26442-3FC1-490A-B505-F0593CDE5E713024×4032 3.06 MB

Actually, its is a bare panel. Mostly for convenience to wire.

The image below is from a similar wiring. Bottom from male plug, then jumper and then board. Checked continuity with the multimeter. It's ok.

A0D8D2EC-598A-491F-ACFD-4D2679B31C6D
A0D8D2EC-598A-491F-ACFD-4D2679B31C6D3024×4032 2.03 MB

4

I was expecting something like https://www.ebay.co.uk/itm/272555627121
I can't see the ribbon but there are 4 SMD resistors and one SMD capacitor.

You don't need the backlight (except at night)
I guess that the ribbon might be in the same order as the header pins.
But you need to find the datasheet for your bare panels.

David.

5

I've got the pinout of the LCD. Since it works for 8 pads LCD, my guess is that also works for 9 pads LCD. Since the IC driver is the same en both (PCF8814), and I get the backlight on with 3.3 volts and GROUND on the same pads for both models.

The only difference is that in the 9 pads version, one pads is unused.

tumblr_inline_okzzq9Fdb71s8tq7e_400

The firt image uploaded in this post (with the legible characters) is from an 8 pads LCD. With the 9 pads I get only backlight. No letters. Also, already tried a custom contrast configuration from the PCF8814 librarie. Nothing.

That's why I'm looking for a way to check if the LCD is damaged in any kind.

6

Yes, it is quite possible that you just have an UNUSED pin.

But I would look for any identification marks on the panel.
Is it really a 65x96 panel with PCF8814 ? Have you read the ID cmds=0xDA, 0xDB, 0xDC ?
Your "unused" pin might be the SDO pin i.e. how you read data.

The Nokia 5110 panels are 48x84 with a PCD8544 controller.

Quite honestly, I would buy a known COG panel / module. And start again.

David.

7

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