Electronics > Repair
Display 3478A
hnjmkl:
In an attempt to rotate the LCD (DSP1) of my 3478A it went KO, P / N 5061-1166. On YT someone managed to replace the 3457A LCD with different displays, even nixie, do you know a feasible project for this intervention? Is the 3478A's LCD different from the 3457A? In appearance they are identical but in the 3457A Service manual I did not find the P / N of the display.
rsjsouza:
I think one of the most comprehensive discussions about replacing HP3478A displays is at the following thread:
https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)
It starts with an LED replacement but there is also mention of using small OLED graphical displays.
(edit) found the other OLED thread. https://www.eevblog.com/forum/testgear/hp3548-hp3457-oled-display/
(edit) fixed URL
ledtester:
--- Quote from: rsjsouza on November 16, 2022, 11:58:28 am ---I think one of the most comprehensive discussions about replacing HP3478A displays is at the following thread:
https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/
--- End quote ---
The first link has a paren at the end which doesn't get included as part of the URL by the forum's editor.
Here's a working link:
https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-%29/
M0HZH:
I used a display from a cheap HP 3488A Switch/Control Unit to restore a HP 5385A Frequency Counter and did some reasearch at the time.
Many of the HP gear of the era use the same displays, there are 3 revisions "groups" where displays are compatible with eachother (so 3478A would work with a 6622A display) but no proof that they're compatible between groups (for example 3478A with 3488A display).
LCD PN: 5061-5212
HP 3478A
HP 6622A
HP 6630A/B
LCD PN: 5181-2813, 5063-2305 or 5083-3473
HP 3457A
HP 3468A
HP 3488A
HP 3852A
HP 5384A
HP 5385A
HP 5386A
HP 6624A
HP 6645A
HP 6674A
LCD PN: 5065-7075
unknown models, after 1995
I'd still get a cheap 3488A unit off eBay and try its display out on yours, not much to lose.
Some of my pics / comments from when I did the swap:
https://twitter.com/YO9IRF/status/1339663054053789696
sagias:
Tested oled on 3478
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