LCD not working (in known working circuit)??

Status
Not open for further replies.

Marks256

New Member
I just bought a 20x4 LCD on ebay (**broken link removed**) advertised to use an HD44780. I just recently got around to testing to see it work, and it doesn't! I placed it in a circuit that i know works, and even tested it with another 20x4 HD44780 LCD, and the circuit works great. But the new lcd i bought just displays gibberish!

I'm really not sure what the problem could be? Does anyone have an explanation for why 2 HD44780's wouldn't work in the same circuit? Maybe i'm over looking something...
 
here is their ebay page i actually bought it from.

**broken link removed**

Quite good feeback.
 
**broken link removed**

1. price $88 (88 dollars). sort of supernatural 10x price. for a reason?

2. using graphics which have the logo from a chinese company. under license? are they an official franchise of sure electronics?

3. distorted America flags. it just does not look nice.

4. same items as sure electronics but 200% price. normal commission is 20% to 50%.

I do not complain but they won't atttract many customers having such unprofessional appearance.

**broken link removed**
very fraudulent:


**broken link removed**
819.99 dollars
 
Some of the more modern chips are much faster than the original Hitachi chip and so they will work with shorter delays in the initialisation and write routines. If your new display requires the original timing parameters then it may work if you increase the delays in your code.

Mike.
 
Last edited:

Thanks. I'll increase the delays and see if that works.
 
Well i solved the problem purely by accident...

I needed to use the interrupt pins (atmega16), so i moved the LCD from PORTD to PORTC, and the LCD magically worked! Turns out on my development board i had the RX and TX jumpers connected to the MAX232 and that was somehow interfering with the new lcd, but not the old lcd. Very simple mistake

It's working like a champ now

Thanks all for the help! it was greatly appreciated.
 
Status
Not open for further replies.

Similar threads

C
  • Question
Remote Control not working
Replies
4
Views
1K
christinescoms
C
S
  • Question
Tpa3116d2 Amplifier not working properly
Replies
6
Views
895
Tony Stewart
1
  • Question
Help! My LCD isn't working
Replies
9
Views
3K
tepalia02
T
H
Anything interesting I can do with parts from this non-working camera?
2
Replies
22
Views
3K
geoffme0
G
J
  • Question
Need input on a prototype I am working on
Replies
9
Views
2K
shortbus=
S
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…