Electronics > Repair
HP 34401a DMM with leaking segments
coromonadalix:
better than nothing eh loll hush hush go find an oled display loll
For the unused second line he could write the function directly : cont, diode in place of the icons ?
hakko:
This setup was just to test the meter main board functions before full restore since i don't have gpib cable. It pass on self tests and on real test it's also fine 8)
bitseeker:
Nice test. If the display controller supports custom characters, that could make for some nice annunciators (if it was for longer-term use).
6151kokodef:
I just bought one from eBay with serial number 3146A57XXX and it has the unobtainium NEC driver chip. It has dots after the characters. I replaced the VFD with one from ebay (Samsung SSVD branded) and it was like new - so glad it's not the chip.
It's an absolute pain to desolder the VFD with a solder sucker, so I put in turned pin sockets to make future troubleshooting and replacement easier.
HighVoltage:
--- Quote from: 6151kokodef on October 22, 2021, 02:22:54 pm ---I just bought one from eBay with serial number 3146A57XXX and it has the unobtainium NEC driver chip. It has dots after the characters. I replaced the VFD with one from ebay (Samsung SSVD branded) and it was like new - so glad it's not the chip.
It's an absolute pain to desolder the VFD with a solder sucker, so I put in turned pin sockets to make future troubleshooting and replacement easier.
--- End quote ---
You also got lucky that the ebay VFD is working correctly. Not all of them do that.
Congratulations on a successful repair.
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