Thurlby Thandar TGA1230 arbitrary waveform generator, display fault

[CambridgeMart]

I've just bought a TTi TGA1230 in lovely condition; it appears to function correctly except that the LCD is very smeary, I've tried adjusting the contrast via the adjustment hidden behind the hole in the panel and it's made a marginal improvemnt, but it's still next to useless. Before I dive in, I was wondering if anyone has a service manual for this or the closely related TGA1240?
Cheers, Martin

[bd139]

Looks like a standard 20x4 LCD module.  TTi used off the shelf parts where possible. I’d whip it out and stick a new one in.

Unfortunately no service manual I can see. Drop TTi an email - they are usually very helpful in this respect.

[Specmaster]

I've just bought a TTi TGA1230 in lovely condition; it appears to function correctly except that the LCD is very smeary, I've tried adjusting the contrast via the adjustment hidden behind the hole in the panel and it's made a marginal improvemnt, but it's still next to useless. Before I dive in, I was wondering if anyone has a service manual for this or the closely related TGA1240?
Cheers, Martin

I think I almost got that as well, was it the one on Ebay where seller mentioned the screen was sometimes smeary?

[bd139]

Damn didn't see that on eBay. Good price 

Looking at the picture on ebay sold items if it is that one, it's a duff module. About £10-15 on RS so no biggy.

Edit: to note, I saw a device with one of those modules in that looked like that after it had air con blown across it for a long time.

[CambridgeMart]

Yes, the one in St Neots and he did mention the display was unclear.
Located a 4x20 display that matches the size and, hopefully, pinout for £6.00, should be here in a day or 2.
Having opened it up I've found it's circa 1996, would never have believed it from it's external condition, this clearly never lived in one of my industrial labs!

[Specmaster]

Yes thats the same one that I was looking at but discounted it because it didn't go high enough, although the screen did actually reasonably clear in the photos.