Electronics > Repair

HP 34401a DMM with leaking segments

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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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