Machsupport Forum

Third party software and hardware support forums. => PoKeys => Topic started by: Bill_O on October 31, 2011, 08:59:28 AM

Title: lcd getting HOT
Post by: Bill_O on October 31, 2011, 08:59:28 AM

i purchased an AND481GST lcd to hook up to my pokeys55
with only the 5v and the ground connected one of the chips on the back gets very hot very fast
when i had everything hooked up it did not work
any ideas?

bill

Title: Re: lcd getting HOT
Post by: borisz on November 01, 2011, 06:11:46 PM

LCD chips should not be hot.
Please check LCD connection. Probably LCD is not OK.
We checked many types of LCDs and most of them are work without any problems.

Title: Re: lcd getting HOT
Post by: budman68 on November 01, 2011, 06:18:42 PM

Quote from: borisz on November 01, 2011, 06:11:46 PM

LCD chips should not be hot.
Please check LCD connection. Probably LCD is not OK.
We checked many types of LCDs and most of them are work without any problems.

Hi Borisz.

You mentioned "most" LCD's are ok, do you have a list of those that aren't?

Thanks,
Dave

Title: Re: lcd getting HOT
Post by: borisz on November 01, 2011, 06:29:45 PM

There was one or two refurbished LCDs which I cannot remember make and model or they was not visible.

Title: Re: lcd getting HOT
Post by: Bill_O on November 02, 2011, 05:39:26 PM

borisz,

they use a HD44780 microcontroler
i thought they were supposed to work.

bill

Title: Re: lcd getting HOT
Post by: borisz on November 03, 2011, 03:17:38 AM

Iz should work iit has HD44780 controller. But if it is hot, probably you did not connected it OK and/or it is broken.

Title: Re: lcd getting HOT
Post by: NeoTO on November 04, 2011, 03:26:21 AM

Did you pay attention to the AND481GST LCD pinout? According to the datasheet, the pinout is not fully compatible to other HD44780 displays. Namely, the +5V is on pin 1 and GND on pin2 (usually, HD44780 displays have these two pins the other way around).

Title: Re: lcd getting HOT
Post by: Bill_O on November 23, 2011, 07:59:00 AM

NeoTO,

the pinout i had showed the 5v on pin 2 and the ground on pin 1
i will flip them and see what happens

thanks
bill