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Replacing OLED screen on an Agilent U1253A Multimeter

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onesystem:
Cool leow4738! I am glad there is a spot where you can buy the SSD1303T10 OLED screens!

Except they charge an arm and a leg for it....

There is a firmware patch for U1273AX that anyone here can do to get the meter to work with OLED screen with driver SSD1309 which you can buy for 5th of the price - around $10 US dollars. And this patch assures that you could replace a fresh OLED screen on that meter any time now!
https://www.eevblog.com/forum/repair/agilent-u1273ax-dead-display/msg5282710/#msg5282710


I do not know if the firmware is the similar and if the main chip on U1253A is the same as on U1273AX. Maybe someone is interested to take a look and see if similar patch can be done for it too.

DavidAlfa:
Please anyone give the modded firmwares a try!
https://www.eevblog.com/forum/microcontrollers/8-bit-78k0-d78f0547-help-with-firmware-modification/msg5144169/#msg5144169

msquared:
The firmware upgrade at the link above works.  :-+

I changed the SSD1303 display in my U1253A with a SSD1309 and upgraded the firmware with from the link above.

With just a few minutes of work and $10 for the display my meter is working again!

I'd suggest watching Stuart Rogers video for a few tips on successfully getting the old display removed from the PCB.


I've included a couple of pics of before the firmware upgrade and after.

--Oz--:
I am a bit confused:
The firmware is not needed if you use the 3 IC flip pcb (as I did 2+ years ago).
I thought the new FW was so you DON'T need the 3 IC flip pcb?
Please correct me where I am wrong, TIA.

DavidAlfa:
Correct!

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