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Old 07-09-2019, 07:26 PM   #1
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ME-RC50 Magnum display problem

I have the Magnum ME-RC remote control installed. It is connected to a Magnum inverter/charger and a ME-BMK. Everything works, except the LCD screen has fading lines. Of course, the line is missing on the lower half of the screen, so I cannot read the numbers.

Is there a replacement option for the LCD screen? I searched the web for days now, but I cannot find it anywhere.

I would hate to buy a new ME-RC just because of the screen.

Any suggestions? Thanks.Click image for larger version

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Old 07-09-2019, 09:17 PM   #2
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What did Magnum say when you called them?
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Old 07-09-2019, 10:06 PM   #3
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Silly question, but does the missing line make it so you canít interpret the screen? If not, Iíd just live with it.
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Old 07-10-2019, 11:54 AM   #4
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Silly question, but does the missing line make it so you canít interpret the screen? If not, Iíd just live with it.


Yes. Since the photo, the bottom line is gone, too. Now I cannot see anything on the lower half.
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Old 07-10-2019, 12:19 PM   #5
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Looks like a fairly standard ASCII 16x2 character LCD display from "back in the day".

If you are the handy type, you can take it apart and see if it matches any of these either by markings on IC's (on the back of the display), exact dimensions, visually, number of contacts, operating voltage (measure yours), or all of the above - spec sheets on each is given in the table below:

https://www.digikey.com/products/en/...=1&pageSize=25
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Old 07-10-2019, 12:23 PM   #6
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What did Magnum say when you called them?
Hmmm

This:

Please wait, the next available agent will be with you shortly....

I gave up after 35 minutes waiting.
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Old 07-10-2019, 12:25 PM   #7
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[QUOTE=boathealer;781091]Looks like a fairly standard ASCII 16x2 character LCD display from "back in the day".

If you are the handy type, you can take it apart and see if it matches any of these either by markings on IC's (on the back of the display), exact dimensions,/QUOTE]


Great idea. Thanks!
I had the same thinking, I just did not know, where to buy those.
You are correct. Screens like this, should not be sold anymore.....
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Old 07-10-2019, 03:47 PM   #8
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Yes. Since the photo, the bottom line is gone, too. Now I cannot see anything on the lower half.

Ah, yeah. Sorry.
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Old 07-11-2019, 12:22 PM   #9
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ME-RC50 Magnum display problem

Quote:
Originally Posted by boathealer View Post
Looks like a fairly standard ASCII 16x2 character LCD display from "back in the day".


I took it apart. See pictures.

Do I need to remove the display from its board, or those numbers are enough for searching? It has 16 pins, but soldered and the screen mounting has soldering, too. I wish there was a board like this available for easy replacement.

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Old 07-11-2019, 12:50 PM   #10
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No, no need to disassemble any further. The board is part of the display and comes as a unit.

The part number for the whole assembly appears to be: PCM1602K-FL-YBS-05

A search on this part number shows (surprise, surprise) an asian manufacturer.

The "1602" display seems to be very common in the hobby world (http://wiki.sunfounder.cc/index.php?...LCD1602_Module), so I think you may be in luck.

It's going to be a bit of a crap shoot, however, because these asian display manufacturers switch controller IC's at the drop of a hat and they are not all compatible with commands over the parallel interface. A 3.3V version is here at Sparkfun: https://www.sparkfun.com/datasheets/...W-FBS-3.3v.pdf

You may need to buy up a few and just try them (You'll still come out ahead cost-wise even having several "misses"). One thing to find out is whether it is a 3.3V or 5V-powered display. They come in both "flavors":

https://www.sparkfun.com/products/9053 and https://www.sparkfun.com/products/255

You can put a volt meter on the Vdd pin of the long row of pins (see spec sheet above for which pin in Vdd) when it is powered up and see what version yours is - I can't see it anywhere on the photos.

Good luck hunting, and let us know what you find out!!!!!

Best,
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Old 07-11-2019, 12:56 PM   #11
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Quote:
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No, no need to disassemble any further. The board is part of the display and comes as a unit.
You may need to buy up a few and just try them (You'll still come out ahead cost-wise even having several "misses"). One thing to find out is whether it is a 3.3V or 5V-powered display. They come in both "flavors":
Best,
Ray
Thanks Ray, this help is excellent!
I will measure the voltage tonight, when I get back to the boat.
The size of the module is 80x36 mm, which is the same to the one you have quoted.
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Old 07-11-2019, 11:27 PM   #12
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Ray. The voltage is 4.95 so it runs on 5 Volts.
Are you saying that the ones you listed are identical? I searched for the exact part number. I could only find one on eBay.
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Old 07-12-2019, 07:40 AM   #13
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Ray. The voltage is 4.95 so it runs on 5 Volts.
Are you saying that the ones you listed are identical? I searched for the exact part number. I could only find one on eBay.
Unfortunately, no, I am not. That's the 'crap shoot' part.

Even if all the other specs are the same, you won't be able to determine beforehand whether the LCD controller is the right one mounted on the PC board. There's a high probability that it would be fine, but not guaranteed. There are a lot of Asian controllers out there and even within the same part number, some versions of the same are a little different.

If it were me, I'd buy 2-3 of the 5V ones with closest dimensions and other specs from different suppliers and try them out. Make sure, at least, that the connector pins are the same.

Sorry - I think that's the best there is. Unless you can get Magnum to sell you a part separately.
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Old 07-13-2019, 11:33 AM   #14
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LeoKa,

If you have a few minutes, call Lauderdale Speedometer at 954-522-4885. They will work on all kinds of stuff and if they can’t help you directly, they might be able to help you source what you need.

Here is their other contact info:

300 West State Road 84
Fort Lauderdale, FL 33315
Monday – Friday
8:30AM – 5PM
www.lspeedo.com
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Old 07-15-2019, 04:27 PM   #15
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Good luck hunting, and let us know what you find out!!!!!
Ray
It is hard to find a panel with the pins strip already on it. I've found one and another, which also includes the pin strip. It has been shipped, so wish me luck.
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Old 07-15-2019, 05:18 PM   #16
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It is hard to find a panel with the pins strip already on it. I've found one and another, which also includes the pin strip. It has been shipped, so wish me luck.
If the pin naming is the same, it's pretty easy to put your own pins in. You can buy a double-sided row of pins just for that purpose. You just solder them to one side, then plug them in to the other.
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Old 07-15-2019, 07:10 PM   #17
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LeoKa,
If you have a few minutes, call Lauderdale Speedometer at 954-522-4885.
www.lspeedo.com
Thanks. Looks like a great company.
I'll try to fix this myself for now. Electricians now charge 100-150/hr. In that case, I could just buy a new unit around $200.
Since everything is working on it, except the screen, I will give it a try.
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Old 07-15-2019, 07:11 PM   #18
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If the pin naming is the same, it's pretty easy to put your own pins in. You can buy a double-sided row of pins just for that purpose. You just solder them to one side, then plug them in to the other.
Yes, that was my thought, too. I can manage basic soldering. I'll report back.
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Old Yesterday, 02:53 PM   #19
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If the pin naming is the same, it's pretty easy to put your own pins in. You can buy a double-sided row of pins just for that purpose. You just solder them to one side, then plug them in to the other.

No luck so far. I received my first order and a pin strip. I did the soldering myself.
I installed the display and it lids up, but no characters show.
It could be my soldering is too bulky and not all pins seated properly. Or, the pin layout is very different. I cannot tell. The pins are not marked on the original. It could proprietary. I doubt Magnum will give it out to me.
I will redo the soldering and see if that helps.
I also have two more boards shipped. If they don't work, I need to try to contact Magnum again and see, if they sell this display alone?
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Old Yesterday, 03:57 PM   #20
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, I could just buy a new unit around $200. .
Doesnít the unit allow controlling the inverter? My two do. That being the case, to avoid impacting the inverter, $200 may be a bargain.
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