HMD Project – Part 12

The non-controllable LCD quandary

A very big thank you to everybody who helped me try and sort out the controller board on the back of the Proview, especially those over at – alas, it seems to be no more.

I managed to make it make noises, nice charging type noises – a bit like the old camera flashes.  But, not a bean from the displays – eventually it just stopped and now pretty much every wire is grounded.

Oh well.  This is only a minor setback, thought I, as at least I have a couple of 1.3” VGA displays now, so that I can retro fit the V4 into a V8 and concentrate the pico project with the easier-to-muck-about-with Proview shells.

However, as with everything else to do with HMD’s it’s not as easy as that.  Nobody knows anything. Nobody is willing to try and know anything, and quite frankly it’s like pulling teeth just talking to people about this stuff.

I have two serviceable 1.3” LCD displays, with working backlights all ready to plug into the V4 shell; all I need is the controller board.  There are hundreds and hundreds of controller boards knocking about, so I thought it would be a cinch to find a controller board to mate with these panels – they can’t, after all, be completely proprietary – surely there are a very limited number of ways to drive a TFT display from the late 90’s!

The displays are marked as T13VM400 with a marking under that as 2CR0078.  Additionally, etched onto the ribbon is the code HCD 200.  HCD 200 seems to be etched onto quite a few small Sony displays of the time, as used in projectors.  The only reference to T13VM400 I can find is here: (translated Page).  The ribbon is a 45 pin jobbie.

So, they appear to be Epson Seiko T13VM400 units. Nice one, simple, let’s find a controller board.

As always, neither Kaiser no Rockwell Collins can help.  Nor can Epson. In fact Epson said I should try Sony, as they now own that part of the business, but I am having difficulty getting a contact at Sony.  I have emailed in the region of 20 companies related to either controller board supply, or HMD’s – with nothing but negatives so far.

Other clues as to how to drive these panels come in the form of the chips on the Proview; they are XILINX XC3142A … These you can see on the bottom of the back board, covered by white stickers, they are 100 pin.

As always, it seems, I am lost.  Almost as lost as all the documentation on every bloody aspect of everything to do with HMD’s. Is 12 years really such a long time ?  I still have old programming magazines telling me how to make a ‘bird’ fly across the screen of my ZX81.  Why don’t massive companies like Kaiser, Rockwell, Sony, Epson, Seiko, Vista and so on have documentation pertaining to products which they mass produced and sold throughout the globe ? It beggars belief.

Once again, anyone ?

This entry was posted in HMD Display. Bookmark the permalink.

6 Responses to HMD Project – Part 12

Leave a Reply

Your email address will not be published. Required fields are marked *