Toshiba LTM08C015KA LCD datasheet and reverse engineering - FPGA VGA output

[adilmalik]

Hi Everyone,

Recently I posted about fixing my HP 54542Cs LCD, turned out to be something simple in the end. Due to the nature of the damage, I dont know how long the LCD will last, so I want to reverse engineer the protocol and add a custom FPGA based VGA output. This way I can also support other LCDs if this one dies.

The LCD in question is a toshiba LTM08C015KA. This is used in the HP54542C and the Anritsu MT8801B Spectrum analyser. Unfortunately, I cannot seem to find a data sheet for it. At first glance it looks like a 18-bit RGB protocol. Does anyone have more info or a datasheet for this lcd?

[marshallh]

Very easy as long as you have a working example. Get a multichannel logic analyzer and tap everything while it runs. Once you find the digital RGB lines you can ignore all but a few of those, and focus your efforts on the control signals. Either it'll be Hsync/vsync controlled, or DE only.
You could also use a FPGA with Signaltap based on the display's pixel clock to capture exact timings.

[Testtech]

It too have an HP scope using this display. Any progress on this retrofit?

[Rasz]

might be similar to this one http://html.alldatasheet.com/html-pdf/143915/TOSHIBA/LTM08C351/1202/4/LTM08C351.html