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Upgrading Mainboard in Lecroy DDA-3000 (aka WavePro 7300a?)

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darkstar49:

--- Quote from: sixtimesseven on December 12, 2019, 11:08:23 am ---Has anyone ever tested adapting the "6Bit RGB" interface of the original display which seems to be a NL8060BC26-17 to somthing a more modern mobo might have?
Replacing the screen seems like a huge operation to me in particular because one has to mount the new display with a new frame...

--- End quote ---

Replacing the LCD, unless for a higher resolution is of little use... and indeed, in any WP7K and WR6K, current LCD's won't fit without some butchery...
(I don't know much about the WP7K, but the AUO from the WR6K had specific mounting holes that were changed for good soon after...)
The problem with very old scopes is that they use a TTL interface LCD, whereas ANY more or less modern mobo will have at best an LVDS port... so unless you manage to find a suitable LVDS to TTL converter, you're stuck. All the ADD- and ADD2 cards also (to my knowledge) output LVDS signals...
Driving the original LCD with a modern mobo sounds like an engineering challenge. ;-)

The problem with the mounting holes is (by far !!) less dramatic as those you may face with the LCD's thickness... (incl. touchscreen !!), so choose a replacement very carefully, in particular as those 3:2 displays become scarce, the choice is often limited, unless reverting to used parts...


nctnico:
Welll... the LCD screen in the 7000A series is LVDS. Still, converting LVDS to parallel is super easy. All it takes is a single chip from TI on a small circuit board.

darkstar49:

--- Quote from: nctnico on December 17, 2019, 09:17:32 pm ---Welll... the LCD screen in the 7000A series is LVDS. Still, converting LVDS to parallel is super easy. All it takes is a single chip from TI on a small circuit board.

--- End quote ---

Didn’t know for the 7kA, as said, never got one... I just looked after the specs of the NEC screen mentioned earlier in the thread... and while it’s indeed no rocket science, I’m putting the fact to make a custom LVDS-TTL board into the ‘engineering challenge’ category... at least when the basic idea is to upgrade the mobo...
But agreed, a bit exaggerated ;-)

So if it’s LVDS, many industrial mobos should fit, and avoid the need for an SDVO card.

sixtimesseven:

--- Quote from: nctnico on September 26, 2019, 01:55:50 am ---
--- Quote from: Converter on September 26, 2019, 01:09:57 am ---
--- Quote from: nctnico on September 26, 2019, 12:25:01 am ---The external output works OK. Everything in the scope is standard.

--- End quote ---
Are you sure that your LCD matrix is working? Or the problem is in the signal cable - over time they sometimes lose connection.
If there are more complex hardware problems, then the idea looks better - to replace with a new motherboard with built-in lvds output (along with the XGA matrix).

--- End quote ---
I dug a little deeper. It seems the cable from the AGP slot is carrying parallel video data (which is then converted to DVI by the SIL164 chip and then back to parallel by the SIL151 or SIL1151 chip). However, I don't see any video data when I probe the signals. It is like the card in the AGP slot isn't detected as an intel 'ADD' card to enable the parallel video signals. OR it needs a special driver from Intel to enable this feature. What I'm wondering: does a working Wavepro show the Lecroy startup logo? It could be a contact problem as well; it seems my 7200A has contact issues in several places. I want to reseat some chips on the video related boards and try again.

--- End quote ---

Well, the 7kA might have LVDS but the Wavemaster 8k and DDA5005 have the 18bit ttl interface.

One option would be to use either a HDMI to TTL board: https://www.aliexpress.com/item/32697331666.html Edit: 50pin / 24bit

There seem to be 40pin TTL adapters available like: https://cdn-learn.adafruit.com/downloads/pdf/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display.pdf Edit: Still 24bit so not usable for 18bit TTL (?)

Or LVDS to 40pin TTL ... But I'm a  bit confused, which mobo's have LVDS? I have never seen it so far but I used mostly consumer mobo's...(?)

darkstar49:

--- Quote from: sixtimesseven on December 17, 2019, 10:21:08 pm ---Or LVDS to 40pin TTL ... But I'm a  bit confused, which mobo's have LVDS? I have never seen it so far but I used mostly consumer mobo's...(?)

--- End quote ---

Many recent industrial mobo's like those from BCM (bcmcom.com), Kontron, Advantech, some Asrock, etc...
Kontron used a lot their 'proprietary' Jili40 connector, while many others use a DF13-40 connector, plus a dedicated backlight connector.
I like Kontron, but putting backlight control and LCD signals on the same connector is BS, knowing that most LCDs have dedicated connectors for both, this makes things unnecessarily complicated for the cables...

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