Author Topic: Replacing OLED screen on an Agilent U1253A Multimeter  (Read 27726 times)

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Offline spalter

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #150 on: April 01, 2019, 06:46:15 am »
Hey Guys,

I do have the same issue with my Agilent U1273A as well. An Agilent spare for the U1273A is not available, they exchange the whole meter for a fixed price. I did a lot of testing and soldering. What I can tell you for sure, only the SSD1303 Oled display will work ! Everything with SSD1305 or higher has the mirrored image, cause the driver is different to the SSD1303.

Unless you find a NOS somewhere, it will not work. As OLED change very fast in China, I did not find any resource to get a SSD1303.

Hope this helps

DPX
« Last Edit: April 01, 2019, 06:48:37 am by spalter »
 

Offline satanistik

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #151 on: April 12, 2019, 03:23:30 pm »
I solve the problem with the mirrored image in SSD1303 replaces to SSD1305 SSD1306 SSD1309.
I use only 3 cmos logic chip.





It's dedicated to cafe machine but if this meter uses 8bit bus its can work.
« Last Edit: April 16, 2019, 03:35:55 pm by satanistik »
 

Offline sanchelo

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #152 on: April 15, 2019, 11:50:47 pm »
Hello, Help scheme!!!
 

Offline sedushi27

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #153 on: April 16, 2019, 05:15:12 am »
Help me too with scheme, please!
 

Offline satanistik

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #154 on: April 16, 2019, 03:27:08 pm »
This method works only in 8bit  bus mode - BS0 = 1 and BS1 = 1. System controller must send 1010000X command - set column scan direction, this hack replace 10100000 commands to 10100001 but if uP doesn't use this instruction or use 10100001 - its doesn't work.
"Delay line" 3 OR gate compensate propagation time - display controller latch command on rising edge of WR/ signal and if I connect WR directly - it does not work.

 
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Offline sanchelo

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #155 on: April 16, 2019, 04:08:14 pm »
Thank you!!!!!!! :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+ :-+
 

Offline sanchelo

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #156 on: April 16, 2019, 04:40:02 pm »
what's the resistor and capacitor?
 

Offline satanistik

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #157 on: April 17, 2019, 04:58:07 am »
C = 100n
corected schematic:
 
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Offline TweakIT

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #158 on: April 21, 2019, 07:45:39 am »
C = 100n
corected schematic:

Thank you very much. Saw your posts on the polish forum.
Since you etched a PCB, do you have a PCB file for this schematic by any chance? Would be nice to just order it on Ali using the file :D 
« Last Edit: April 22, 2019, 06:44:56 am by TweakIT »
 

Offline stupid

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #159 on: May 18, 2019, 04:31:48 pm »
Hi everybody,

I found a Chinese vendor that provide OLED display for U1273A and U1253A/B,after my trial,it's ok on my U1273A and U1253A.

List price as below:
For U1273A,59.99 USD
For U1253A , 69.99 USD

https://item.taobao.com/item.htm?spm=a230r.1.14.101.7c43260eXXQFvS&id=591402268582&ns=1&abbucket=19#detail
 
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Offline mcookieman

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #160 on: May 22, 2019, 07:33:16 pm »
Thanks satanistik!
After seeing your post about the command to control column scan direction I probed the meter to check if it sends that command (and it does).
I put together a PCB and it works! :) (with a minor bodge on the 12V boost converter)

I finally have a working multi-meter after nearly 2 years..

I rearranged the logic a little bit and used 74HC / 74HCT gates so it only requires two chips. No need to delay the WR signal, but there is the provision to do so on the board.
Attached is a schematic, I'll upload the design files when I have some free time. I also have 8x sets of PCBs + components (no display) if anyone is interested in building their own.

 
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Offline amigos

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #161 on: May 23, 2019, 05:59:49 am »
Very good job.
Please upload file project.
What display you used? ssd1309?
Thanks!
« Last Edit: May 23, 2019, 06:20:43 am by amigos »
 

Online wraper

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #162 on: May 23, 2019, 06:26:29 am »
Attached is a schematic, I'll upload the design files when I have some free time. I also have 8x sets of PCBs + components (no display) if anyone is interested in building their own.
I would suggest not using AMS1117-3.3 but something with lower quiescent current. Adding 5mA to already poor battery life does not help.
EDIT: AP3012 is also far from the best from this standpoint (3mA) but about on par with original MC33063. However you should use higher feedback divider resistance. It consumes almost 1mA from 12V which translates into about 2mA from the battery.
« Last Edit: May 23, 2019, 06:37:32 am by wraper »
 
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Offline satanistik

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #163 on: May 24, 2019, 05:05:00 am »
https://www.elektroda.pl/rtvforum/viewtopic.php?p=17977216#17977216
Similar topic on elektroda forum.

mcookieman - I see in you schematic line D/C is not connected to logic. This may cause display data modification - some white drop.  My logic is transparent for display data and modify only command.
« Last Edit: May 24, 2019, 06:00:03 pm by satanistik »
 
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Offline marcopolo

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #164 on: May 24, 2019, 08:57:52 pm »
May be you can correct this problem  ;D

The MCU send a A0 command (COL0=SEG0) at startup of the u1253.
If you count the WR pulses, when you see the ninth you force the line D0 to 1 (COL131=SEG0) to transform the command A0 to A1.
But if the MCU send an A0 command later, you're dead!

Or you can use a comparator (more wires)
If D/C=0 and data=A0 and WR=0, you force D0 to 1 before the rising edge of WR

It's just an idea, not sure it'll work.
Marc

That's what I proposed eight months ago.
 
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Offline mcookieman

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #165 on: Yesterday at 12:51:09 pm »
@wraper
 - great suggestions, I didn't consider many things when designing this board. I"ll swap those parts out before releasing the design files.

@satanistik
- Ahh that is true; I haven't noticed any significant glitches in the display so it looks like I got lucky.

@marcopolo
- Apologies and thanks, I completely missed that; I wasn't following this thread closely at that time.
 

Offline satanistik

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Re: Replacing OLED screen on an Agilent U1253A Multimeter
« Reply #166 on: Today at 01:16:42 am »
I need delay WR because in Nivona coffe machnie suply voltage is only 2,7V.
 


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