ST7565 based lcd UMSH-7701MD-1B [ Solved ]

Using Arduino Displays
1

Hi.

I salvaged a ST7565 based lcd, labelled UMSH-7701MD-1B, white backlight, 128 x 64, from United Radiant Technology.
I only got a poor description of the pinout, but useless. The LCD Is connected with a 20pin flat ribbon to a FFC/FPC connector ZIF.
I'm looking for the LCD pin out. I found so far, some very similar ones, but all with 30pin connector, and external backlight power connector.

Any help is welcome.

2

Photo?

3

casemod:
Photo?

The best ( worst ) from my cell:

4

I used to work with a similar one years ago, but it was 18 pins. We used a breakout board. The display needs decoupling capacitors for the auxiliary voltages, its not as easy as getting the data signals and power in.

Best of luck, but my experience tells me you're better off getting something a bit more user friendly.

lcd1.png
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5

Thanks a lot casemod.

That was close with the info found here:

But $8.99/month.. to get a pdf with a schematic... no way. :slight_smile:
This lcd , I got it in a ez-stream device from SMC,was in-box, never used, but better spend some $$$ to one with full support.

Thanks again. I will try to find some free info...

6

Hi

I finally got the connection schematics:

casemod, what was your experience with your version ? "its not as easy as getting the data signals and power in"

The five data signals will be connected with a arduino 5vts, so will need to decrease voltage to 3.3. What is your advice for that, 10k resistors ?

Thank again for your help.

7

You need to assemble a breakout board and add the required capacitors. I would suggest SMT if you are OK with them. Of course you also need to solder the wires in the plug (the tricky part: if you add too much heat you melt the cable).

For voltage conversion I would try first with 47K and reduce, if needed, after verifying the signal with an oscilloscope.
These lcd's draw very little current, therefore the internal zener's may get damaged.

8

Hi

Again, thanks casemod.

I will try by other way to avoid capacitor issue.
I just cut the board all over the ZIF socket of the lcd flat cable, were are all caps and resistors for internal lcd functions are. I found all voltage points and data line needed for the lcd.
By this way I will just need to convert 5v to 3.3v, and it will be done with a Bi-directional Level Converter for the 5 lines of data's, I ordered 2 of them. But for know will try with resistor as you say.

Next days I will try do it working :smiley: