Can I fix a 16x2 LCD that I wired wrong?

[Mbira]

I mistakenly incorrectly wired one of these vishay LCDs:
http://www.vishay.com/docs/37300/37300.pdf

Now that it is wired correctly, some of the horizontal lines are not displaying.  Is there a way to fix that, or is there something I should look for-like a burned out diode, etc?  It's all SMD parts.  I just hate to have to spend $20 on getting two LCDs shipped here if I can fix them (yes, I did it with two of them...)

PS: I think I fed reverse voltage, so I put 5V to ground and 0v to the vcc.

 

[Mbira]

ok.  I was hoping there may be some trick to "reform" the crystals or some such...oh well-just ordered two more.

 

[keefaz]

Did you check if all the H/L data line pins are wired correctly ?

 

[JohnRoberts]

It looks like plugging it up backwards swaps power with logic inputs and vice versa...  If they were clever about the internals it might have survived.

Are the symptoms suggestive of internal damage or perhaps a missing logic interface line?



JR

 

[Mbira]

THe pins are weird on this...the mis-wiring made pins: 2->1, 4->3, 6->5, etc

So I swapped ground and voltage.  Pins are now wired correctly.

The symptoms are that there are horizontal lines of no activity and a few places where the pixels (?) are black all the time while powered.  Those black button bulby looking things on the back got very very hot while being mis-wired...

 

[JohnRoberts]

These modules often have simple 4 bit micro controllers built in...  that may heave been damaged. It might be possible to replace, but you would need the right one, coded for the specific application.

Another good reason to not plug in ICs backwards.

Back when I was in the kit business I tested all ICs 100% before sending out kits, so if a customer told me the IC was bad, I could tell him that it was good when I sold it to him.

Stuff happens.

JR

 

[keefaz]

THe pins are weird on this...the mis-wiring made pins: 2->1, 4->3, 6->5, etc

So I swapped ground and voltage.  Pins are now wired correctly.

The symptoms are that there are horizontal lines of no activity and a few places where the pixels (?) are black all the time while powered.  Those black button bulby looking things on the back got very very hot while being mis-wired...

Keep in mind that the LCD pins are not numbered like the ICs

It is like :

1 2
3 4
5 6
...

See for example :
http://www.ladyada.net/learn/lcd/lcdshield.html

 

[Mbira]

yes- indeed.  and unfortunately, I did not know that at the time-I just saw the "pin 1" and ran with it...