EII "Exact Replacement" display

[Electro disco club]

Thanks,

I have order another parts from eBay.

It very strange that the inverter Works only when i switch on thé EII, after boot and load bank it begins to show bad letters

[80sboy]

Did you ever find a correct inverter that works?

[Electro disco club]

No !

I have check on sp 12 Turbo witch one it is cause the new lcd backlight works fine .

I can find a M74LS14P on it.

I will order one soon....

[HideawayStudio]

Yet again...  I think my mod for new displays may fix a lot of these issues.....

This is actually a common issue which I've reported a fix I came up with before but perhaps not on this site.

The LCD timing on the EII is marginal and although it just about works with older HD44780 compliant LCD modules, many of the modern equivalents have faster timings. 

This often manifests itself by showing nothing, a solid bar or garbled characters on the bottom line of the display.  The top line is always fine with a new display fitted.

The fix I came up with several years ago has helped a number of other owners to make their new displays work so this is definitely worth a try....

FIX: Solder 4.7NF metal film capacitor between pin 1 (Ground) and pin 6 (Module Enable) on the LCD module header.

This works by slightly lengthening the Enable pulse to the display.

[Electro disco club]

Great  .

I will try.