Screen not illuminating

  • Thread starter Thread starter Martyn Arthur
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SUMMARY

The discussion centers on troubleshooting a non-illuminating HD44780 1602 16x2 Serial LCD display connected to an Arduino Uno. The user, Martyn, initially connected pins 15 and 16 incorrectly, which led to the backlight failure despite the meter reading 5V. After clarifying the wiring and confirming previous functionality, Martyn acknowledged the mistake and expressed gratitude for the assistance received.

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  • Understanding of HD44780 1602 16x2 Serial LCD wiring
  • Basic knowledge of Arduino Uno connections
  • Familiarity with using a multimeter for voltage testing
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  • Review the HD44780 datasheet for detailed wiring and functionality
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  • Investigate proper resistor usage in LCD backlight circuits
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Martyn Arthur
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problem checking bacground on this;Compatible with HD44780 1602 16x2 Serial LCD White Character Blue Backlight Display Board 3.3V 5V Compatible with Arduino
Hellol I have pins for this; apologies for subseqquent bold; bold option is not responsive.

Compatible with HD44780 1602 16x2 Serial LCD White Character Blue Backlight Display Board 3.3V 5V , Using Arduino Uno.

15 and 16 connected; 16 to gnd via a 220ohm resistor and 16 to 5v. Mtest meter reads 5v but the screen is not illuminating.

It had previously been functional. Is any other test possible or is i that the module has become faulty?

Thanks
Martyn

PS: mentor adjusted to remove bold text.

It wasn’t bold tagged it was bracketed by [ head ] tags and that’s why it didn't unbold.
 
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Can you link to the display's datasheet?

Martyn Arthur said:
It had previously been functional. Is any other test possible or is i that the module has become faulty?
Did anything happen as part of it starting to not work? Did it get dropped or plugged in wrong or anything else like that? Is it only the backlight that is not working (can you see dim characters without the backlight?)?
 
i don't know of anything untoward. Originally just the screen functioned with no characters then it just gave up. Am I correct in believing that the wiring previously described is such that the screen should illuminate?
Thanks
Martyn
 
Ah got the wiring messed up, ok now; apologies for having wasted your time; thanks for your patience!
Martyn
 
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