Electronics > Repair
Advantest R6581 VFD replacement
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daisizhou:
I also encountered the same fault as you, that is, the display is dim due to the aging of the VFD.
I don't know what is the best solution for my VFD GU256X32-302.
GU256X32-302 has been discontinued.The interface positions of GU256X32-800 and GU256X32-820 are different. I don't know if they are compatible.
I would be very grateful for your help, thank you
Mickle T.:

--- Quote from: vinovino on November 21, 2024, 02:26:37 am ---Can this VFD replacement work on Advantest R6243 display?

--- End quote ---
It can be easily adapted to the R6243 display. It is only necessary to adjust the segment arrangement table and the regeneration sequence table. I think I will do this as soon as I get hold of such a power supply.
gamalot:
I am also trying to do almost the same thing as dietert1 did, but it got delayed for some reason. I chose the STM32H750VBT6 because it is much cheaper than the STM32H730VBT6 if purchased from LCSC.

I have only done a small part - displaying some pictures on the screen, which I think is a good start. Recognizing those characters should be easy, so presenting in different themes should be an option.

I haven't looked at the manual yet, and don't know if the tR6581 can display customized content like some other instruments, if it can, special pattern character sequences can be recognized as some instructions to control the display to do anything it can do, such as changing the theme, adjusting the backlight brightness, running screensavers, etc.

I ordered a 6-layer board with a size of 50mmx50mm, which has some other functions on it, USB, battery for the real-time clock, lithium battery charging, temperature and humidity sensor, buttons, etc. Please just ignore them.
Mickle T.:

--- Quote from: gamalot on November 24, 2024, 10:47:55 am ---I haven't looked at the manual yet, and don't know if the tR6581 can display customized content like some other instruments, if it can, special pattern character sequences can be recognized as some instructions to control the display to do anything it can do, such as changing the theme, adjusting the backlight brightness, running screensavers, etc.
--- End quote ---

Without a firmware patch R6581 can't display customized content like some other DMM. The R6581 supports the command "DISPLAY 0" which prints the string "DISPLAY OFF" to the display. Recognition of this string can be used as a flag to turn off the display backlight.
gamalot:

--- Quote from: Mickle T. on November 24, 2024, 11:33:52 am ---
--- Quote from: gamalot on November 24, 2024, 10:47:55 am ---I haven't looked at the manual yet, and don't know if the tR6581 can display customized content like some other instruments, if it can, special pattern character sequences can be recognized as some instructions to control the display to do anything it can do, such as changing the theme, adjusting the backlight brightness, running screensavers, etc.
--- End quote ---

Without a firmware patch R6581 can't display customized content like some other DMM. The R6581 supports the command "DISPLAY 0" which prints the string "DISPLAY OFF" to the display. Recognition of this string can be used as a flag to turn off the display backlight.

--- End quote ---

This is bad news, but being able to send a command to turn off the backlight is good enough, better than the switch I put in the PCMCIA slot on the front panel to turn off the VFD.

I also considered long-pressing a button to turn off or wake the display, and the Home button seemed like a good choice.
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