[FIXED] help me find a 7-segment LED display

[TheMG]

LED 7-segment temperature display for a wine refrigerator, has several segments not working so I'm trying to find a replacement. At first glance seems like a bog standard two-digit 7-segment display, but the pinout is unlike anything I can find that is readily available!

LG4021AH

Only relevant hit on google is this Chinese manufacturer's site: http://www.yxkd.com/product_txt.asp?pl=720

I'd like to avoid having to bodge in a display with a totally different pinout, but that might be what it comes down to...

[WattsThat]

This is honestly the first link I checked on eBay:

https://www.ebay.com/itm/143089482733

Single pieces:

https://www.ebay.com/itm/253205048535

[TheMG]

Thanks, that's a fitting replacement but unfortunately there's a time constraint and this is shipping from China no way I would ever receive it in time (China to Canada shipping often takes a couple weeks, sometimes over a month if customs decides to take their time).

Guess I'll get one off Digikey and mod-wire it on.

[james_s]

You could contact the seller and ask if they're willing to use a faster shipping service. They are probably used to dealing with cost-sensitive customers but if you're willing to pay for it they might use DHL or whatever.

[tooki]

I’d also check to see if the LED driver is actually working on the failed segments. No sense in replacing an unusual display if it’s actually the driver that’s gone bad.

[TheMG]

Directly driven from a small microcontroller.

That was the first thing I checked whether it was actually the LED display or not. Found several segments shorted.

Anyways, I ended up getting a SMD 7-seg display from Digikey and using mod wire the make the connections to the appropriate pins, a little hot snot to hold it in place, good as new.

Didn't want the headache of trying to get the exact replacement from China plus I'm skeptical of the original part's quality. Based on the resistor values and supply voltage, it is being driven at 10mA peak per segment, 5mA average (the two digits are multiplexed), well below the datasheet ratings so there's really no reason those segments should have ever shorted.

[james_s]

If I had to guess, I'd say probably ESD damage, or possibly just a bad run of parts. Some of that cheap Chinese stuff is a crapshoot, you might get excellent quality or  you might get crap.