Electronics > Repair
Advantest R6581 VFD replacement
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IanJ:
Hi all,

LT7680A-R TFT LCD Driver for the R6581 DMM, prototype Pcb fitted to my R6581T......finally!

Photos below, and here's a quick YT Short:
https://youtube.com/shorts/QG-DmSFydeg?feature=share

Also, photo of what will be the production Pcb. Gerbers will be available soon in addition to the STM32 Blue Pill code etc. Just got to double check VFD SDA and SCK in-case I reversed them on the Pcb....oops!

The code is 99.9% complete, most of the past couple of days was going through the Calibration menu's on the R6581 and making sure I had all the font characters mapped. I did have a bit of trouble with dual OHM symbols on the Cal menus but got it fixed in the end. If the LT7680A-R had a built in character for the OHM symbol it would have saved me 250 lines of C code manipulating the OHM symbols into place.

There are two header links on the board:-
LK1 = swap the MAIN and AUX line colours (yellow & white). I prefer white for MAIN.
LK2 = choose between green or cyan for the ANNUNCIATOR colour. I prefer green.

The board has a notch out it as you will see, that's to accommodate a 100uF electrolytic capacitor on the main display board that gets in the way. I didn't want to move it.

After fitting the board there is just 5 short connections down to the R6581 main display board.

Assembly of the whole thing is a little tight, due to the length of the LCD flat flex and the R6581 front panel flat flex's also, if you don't want to disconnect them.

Note: The LT7680A-R board as purchased needs two solder links changed (to do with backlighting internal or external control):
J1 = open
J2 = closed
J3 closed (as supplied)

When the production PCBs arrive from PCBWAY I'll be doing a full YT video of the installation on my other R6581T.
I'll also edit this post and put a full parts list along with the gerbers and code etc.

Again, thanks to MickleT for the original reverse engineering without which........
PS. Boot screen on the LCD has a wee 5sec nod to MickleT.

Ian.
IanJ:
Hi all,

Video published on my TFT LCD effort:
https://youtu.be/rv6x6VsWyRo

Files:
GIT source = https://github.com/Ian-Johnston/R6581_VS_Display
GIT .HEX file = https://github.com/Ian-Johnston/R6581_VS_Display/tree/master/VisualGDB/Debug
Gerbers = https://www.ianjohnston.com/R6581_TFT/Gerbers.zip
Instructions = https://www.ianjohnston.com/R6581_TFT/Instructions.pdf

Parts:
LCD & LT7680A-R (c/w flat flex & FPC conn) = https://www.buydisplay.com/bar-type-4-58-inch-320x960-ips-tft-lcd-display-spi-rgb-interface
1 x 33uF 100V electrolytic capacitor (optional)
1 x 100uF 10V electrolytic capacitor
1 x 1uF polyester capacitor
2 x 10mm M3 brass standoffs
1 x STM32 Blue Pill (STM32F103C8T6)
1 x 5-way male SIL header
2 x 20-way arduino style female header
2 x Strips 2mm double sided tape
1 x Strip 6mm single sided foam

Ian.
branadic:
Well done.  :-+
What are the other color schemes that can be choosen?
Now you only need to fix the INL issue. ;)

-branadic-
IanJ:

--- Quote from: branadic on December 17, 2024, 04:47:59 pm ---Well done.  :-+
What are the other color schemes that can be choosen?
Now you only need to fix the INL issue. ;)

-branadic-

--- End quote ---

Nothing heavy.......

Swaps the yellow and white MAIN/AUX display colours.
Select green or cyan for the Annunciators.

The jumpers are read at boot.

Ian.
branadic:
Thanks, a VFD like look instead of the Rigol color scheme would have been nice, but I also like the look of the Valhalla 2720 display.

-branadic-
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