Products > Test Equipment
Replacing OLED screen on an Agilent U1253A Multimeter
voltsandjolts:
@kitsune
I have a 1272A which is IMHO the best handled DMM for electronics. Avoided the '73 because of the screen issue - but it's no longer an issue!
You NAILED this. Nice low power solution and very well documented :-+
Edit: Is this now the world's first handheld DMM with an FPGA inside? 8)
The Hooded Foot:
I'd just like to add my thanks to Kitsune.
After my U1273A screen died, I found a video in which someone replaced the screen with the OLED from a Bolymin BL12864G, which was a near drop-in replacement] since it uses the same SSD1303 controller. Unfortunately, I accidentally bought the BL12864G2, which uses an SPD0301, and has a different pitch flat flex connector.
Kitsune's design will be a great base for me to try and adapt to this different screen.
Once again, my thanks for your hard work.
kitsune-denshi:
Thank you all for your kind messages, really appreciated!
I'm personally quite keen to see how gmarsh's design works out - it's quite a bit less complex and so should be even easier to build or adapt.
Out of curiosity, does anyone actually know what the actual failure mechanism of the original OLEDs is? To me it felt way too abrupt to be ageing (meter was fine, put it in a box for 4 months, screen was unusably dim when taking it back out), so I wonder if it's actually the controller dying?
chickenHeadKnob:
--- Quote from: kitsune-denshi on March 18, 2021, 07:44:59 pm ---Thank you all for your kind messages, really appreciated!
I'm personally quite keen to see how gmarsh's design works out - it's quite a bit less complex and so should be even easier to build or adapt.
Out of curiosity, does anyone actually know what the actual failure mechanism of the original OLEDs is? To me it felt way too abrupt to be ageing (meter was fine, put it in a box for 4 months, screen was unusably dim when taking it back out), so I wonder if it's actually the controller dying?
--- End quote ---
One mechanism is moisture getting inside display, causing chemical degradation of oled. controllers can last forever pretty much.
gmarsh:
--- Quote from: kitsune-denshi on March 18, 2021, 07:44:59 pm ---Thank you all for your kind messages, really appreciated!
I'm personally quite keen to see how gmarsh's design works out - it's quite a bit less complex and so should be even easier to build or adapt.
Out of curiosity, does anyone actually know what the actual failure mechanism of the original OLEDs is? To me it felt way too abrupt to be ageing (meter was fine, put it in a box for 4 months, screen was unusably dim when taking it back out), so I wonder if it's actually the controller dying?
--- End quote ---
Current state of 'er: it's madness at work right now so I haven't had a chance to do any further work on the thing.
I can confirm that the SSD1309 panel soldered onto the original board produces a working but backwards display, so I can confirm I haven't fried the meter or display with the reversed connector.
I did a bunch of trace cuts and airwires on one board to get the pinout "sort of right" again, but it doesn't work, even with the CPLD acting in passthrough mode. Not sure what's wrong, but I'm going to modify a 2nd board and hope for the best.
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