Nokia 5110 (life or death ?..)

Other Hardware Displays
1

Hi, folks!

Need your help on subject display (red one, looks exacly as sparkfun).
Have received one a week ago and still trying to get it work properly... 8)
The issue is display works only occasionally, randomly shows designated images and text, but much more often i see just random flicker horisontal lines. Moreover, normal images or text appears usually on first wiring, the next or third attempt after reset may be faulty - while on first attempt i can see normal images between flickers, after power off/on it can be only flickers or nothing. So i do afraid that the issue is hardware... 8) only LED works fine
Connection is to arduino nano 5 v as per sparkfun scheme for such devices i.e. via 10k resistors.

I've checked voltage and current on display and result seems to be a bit disappointing

PIN / Voltage / Current

VCC / 3.28
SCE / 2.32 / 0.46
RST / 0 / 0
D/C / 2.28 / 0.45
DNK / 4.57 / 0.47
SLK / 4.57 / 0.47

is it almost dead ??? 8)

2

You can't get much meaningful from measuring voltages (or currents) of a high speed logic signals if they are changing - multimeters measure on a timescale of around a second, logic signals change upto 8 or 9 orders of magnitude faster than that.

How fast are you driving the signals ? Is this hardware SPI? How long are the wires?

3

solved using 4050 level shifter.