Products > Test Equipment
Replacing OLED screen on an Agilent U1253A Multimeter
voltsandjolts:
--- Quote from: gmarsh on March 12, 2021, 07:04:36 pm ---my crappy Aliexpress USB Blaster clone doesn't work at all.
--- End quote ---
Maybe your having the same problem I had with driver install on Win10. I just got a cryptic error message about a bad driver.
Turns out that Win10 by default now requires signed drivers and Intel/Altera are too lazy to sign theirs.
Of course the error message doesn't explain that at all.
You can perhaps disable signed driver enforcement or use an older signed driver.
See this thread:
https://community.intel.com/t5/Programmable-Devices/Windows-10-driver-support-for-USB-Blaster/td-p/55323
gmarsh:
Got it working! Had to change the driver in device manager, go through the whole "Have Disk.." dialog, choose a Bus Blaster II JTAG driver from the Quartus install directory and ignore a bunch of warning dialogs.
Modifying the board to fix the connector miswiring looks feasible, since I can reorder them in the FPGA. Gotta pull the pin header to cut a trace between the two VBAT pins, but that's not too bad. Another goof is I didn't 100% nail the mounting hole locations so I have to enlarge the holes a little.
kitsune-denshi:
Right, so after over a month I finally had the time to sit down and document the display interface board: https://kitsune-denshi.net/projects:display-if
The board replaces the power supply / display mounting board in the U1273A and takes a "normal" SSD1309 display (although with a ZIF connector as opposed to the soldered type used originally). I think this takes care of all the weird and wonderful display artifacts and should give you the "original" display experience.
If you would like to build your own, please have a look at the web site linked above where I have put all the design files. I haven't had any issues building two of the boards, so I'm quite confident that the design is ok to build as-is. Also, you do not need a programmer for the FPGA - it's enough if you can program a serial flash through SPI (e.g. using the ICSP port of a XGecu TL866II Plus). If you do run into any issues, especially compatibility issues with different multimeter models or firmware versions, please do let me know so maybe I can try and address them.
The BOM component cost is just over €10 (at one-off quantities), so with PCB and display you'll be looking at a total material costs of maybe €35-€40. So depending on how much you value your time / enjoy tinkering with equipment that should just work, you might be better off following the route outlined by e.g. norb above and just get a direct replacement display.
Anyway, I'm really glad that I could finally put the lid back on the multimeter and now continue with the never-ending list of other projects that always take way too long and probably will never get finished.
rsjsouza:
That was a great procedure. Thank you for sharing.
eb4eqa:
Great work, thank you for sharing.
Your website is fantastic.
Roberto
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