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Replacing OLED screen on an Agilent U1253A Multimeter

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wraper:

--- Quote from: tim_25 on January 16, 2022, 12:02:33 am ---Hi all,

I purchase 2 displays from parcelup for U1253A and U1253B I own but unfortunatly, the fixing screws don't match the original display and the screen is mirrored (displays received is not the same as in the picture...).
For the 2 displays, the cost was 124.85EUR+32.13eur shipping=156.98eur so I hope to find a way to make my DVM functionnal.
Two options:
1. add the pcb interface to unmirror the display and let the display unfixed with addition of kapton protection on the circuit where the spacers touches the PCB
2. unsolder the display from the PCB I received and solder it on original Agilent PCB as described in Markus Coneheads.de blog:
http://new.mash.webclient6.de/index.php/bauen/sonstiges/47-agilentu1252

The second option might be the best but I am not sure the display is fully compatible (number of pins and pitch seems to be the same) and not sure I can unglue the display easily from the PCB.
I will inform you which option I choose! Just a first feedback to inform you that parcelup products are not reliable! It worked for eeffpe but not for me  :(

Cheers

Happy new year!

--- End quote ---
Return that junk. For this price you could order a display with custom PCB fitting the multimeter (the better kind without any visual artifacts). Soldering it on original PCB will not help with mirroring issue.  Bare display with SSD1309 costs less than 15 EUR on Aliexpress and will give you the same mirrored image.

Fungus:

--- Quote from: effpe on October 09, 2021, 08:25:57 pm ---My U1253B went dim after 6 years of very light use.

--- End quote ---

OLEDs degrade with time, not use. After 6 years it will lose brightness even if it was never used.


--- Quote from: effpe on October 09, 2021, 08:25:57 pm ---And of course, shame on Keysight/Agilent.

--- End quote ---

Why?

tim_25:
Hi, thank you wraper for your feedback. I understand now that SSD1303 is attached to the display and not the PCB... so no chance for just soldering the mirrored display to the original Agilent PCB...
The response from parcelup regarding my issue is that they sent me the U1273A compatible display and that there is an option to choose between U1253 or U1273 when ordering! but there is none!...
So I might have received two displays for U1273A which pictures are below.
Two options now:
1. Try to use the displays I received and solder it on orignal Agilent PCB with additional PCB tricks to unmirror the display.
2. Find someone interested by U1273A displays at the cost mentionned earlier (about 80eur + shipping fee for one display) and then find some cheaper display to solder on orignal Agilent PCB with additional PCB tricks to unmirror the display...
For me both options are the same with a lot of efforts and money to solve this issue :(

rtekal:

--- Quote from: Kimmeridgien on September 25, 2021, 04:26:01 pm ---Hi all and thanks to everybody who have contributed to this work.

I am kindly asking for feedback on my adapter board for the SSD1305-based display.

I read the below excellent project description and decided to add a MUX to the simple logic gate design:
https://kitsune-denshi.net/projects:display-if

Assuming that Kitsune Denshi is right about the reason for the artifacts, it is easy to properly handle the case of reading from the SSD130x controller. He / she does that by not actually reading from the SSD130x but instead just returning 0x00 to the U1253x (which seems to work OK). The simple logic gate design doesn't read bit D0 from the SSD130x controller but actually tries to drive this pin at the same time that the SSD130x controller is driving it. This might be bad in the long run.

My humble addition is to add a MUX that couples the SSD130x D0 pin to the U1253x D0 pin when WR# is high, and couples the D0' from the simple logic gate design to the SSD130x D0 pin when WR# is low.

Before ordering the PCBs I would appreciate proof reading, if anybody feels up to it. I'm attaching some screen dumps and photos. My solution requires cutting one PCB trace and soldering one wire.

Thank you in advance and best regards

Niclas

--- End quote ---

Hi,
Thanks for the new adapter board design.
Could you please share the gerber plot files for the same.

Regards

brainhouston:
Does anyone know how to tell the color of these displays apart without powering it on?
I've ordered 2 different colors of ssd1305 from aliexpress but they have no labels of any kind on the packages i got, nothing on sellers page and no response to questions.

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