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Replacing OLED screen on an Agilent U1253A Multimeter

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johns:

--- Quote from: tautech on October 21, 2020, 11:18:33 pm ---
--- Quote from: pwrtrnx on October 21, 2020, 09:58:46 pm ---Hello Johns,

Do you still have any replacement screens left?    pwrtrnx  -  NZ

Yes, I have some extra boards as per ultrasmurf solution for Agilent U1253A and with all the parts on the board.
For our project we had to redesign all and it is working fine.
For Agilent the board is ready to use as per ultrasmurf design.


 
--- End quote ---

--- End quote ---

gmarsh:

--- Quote from: eb4eqa on February 01, 2021, 10:14:47 pm ---Hi gmarsh. Very interesting, thank you! I have one U1273A and MSO. I will look at it over the weekend ok?

Roberto

--- End quote ---
Thanks for offering!

The pinout for the U1253A screen is on mcookieman's post here:
https://www.eevblog.com/forum/testgear/replacing-oled-screen-on-an-agilent-u1253a-multimeter/msg2428572/#msg2428572

There's a female connector on the main PCB, you'll want to find a matching 2mm pitch connector that plugs into it to give you something to clip your DSO leads onto. If your display's dead I suppose you could just rip the connector off it and use that. Just please don't poke old resistor legs into the connector and damage your meter to do this test for me.

I hook up R/W, D/C, the 8 data lines and ground. Set up the MSO to trigger on D/C being low and a rising edge on R/W.

There's a blast of assorted commands when the meter starts up, after that the U1253A spits out over and over again:
... bunch of data writes ... <Bx> <0x> <1x> ... bunch more data writes ...
Bx selects the page, 0x is the column address LSB, 1x is the column address MSB. Key being the LSB comes first.

I should have taken an actual screen capture from the MSO instead of a picture of what I was doing, but you can see the address write waveform in the picture I posted earlier. I'm hoping the 1273 does the same.

Bhflex57:
Hi. Can you please send me any website where I can get the OLED module for my Agilent U1273bAX  ? I see a few links that don't work but don't know where to get the part .
SOS electric needs a part number .
Taobao link doesn't work .
I appreciate the help !

Bhflex57:
Hi.
Do you now have a fix for the OLED screen replacement on an Agilent U1273 AX DMM ?
If you can help with part numbers , place to order , other necessary steps , etc. I would appreciate it.
Do I need a new board as well ? Your custom one ?
Please let me know.
I am in US .
No repair shop seems interested or able to find the part .

gmarsh:
Another update:

JLCPCB and Mouser orders placed! I've ordered 5 PCBs, 5 PCBs worth of parts, but still have just 1 screen coming from Aliexpress.

Thanks to EB4EQA's work, I can confirm the U1253A/U1273A both write to the screen identically, and this solution should work in either meter.

Next update will come in a couple weeks when I have all hardware in my hands.

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