Need Help Identifying and Finding a Specific Componet

Looks like this may be the one (common Anode version). Unless you can find the same part number, you'd need to find one with the same pinout, but there are not many 0.3" 3-digit common-anode displays, and I didn't see any that matched that pinout. So, possibly you need to find that same manufacturer part.

By the way, LED displays rarely fail (I've never seen a modern LED display fail, so are you sure it is faulty?).

Yea I found a match on the element14 store and Mauser but the pins don't appear to have the gap on the 5 pin side. I am thinking about just getting one and trimming the two terminals and using some serial wire to route them to the holes before seating it on the board as theres a gap between the board and bottom of the display.

I contacted the manufacture of the gauge and they wont supply me with the part or who makes them for them as they want me to pay $60 plus shipping both ways for them to repair a $5 fix.

I hooked the gauge up to my oscilloscope and checked the pin terminals and they appear to be functioning properly. Only 3 or 4 random LEDs in the display don't light up and they don't appear to be in common with each other on the data sheets for the displays I've found.

Also the inputs and processors are functioning properly as there is a secondary sweep display which is all the LEDs around the outer edge red/green/orange depending on display read out and they function properly along with an auxiliary out put for a data lodger that is functioning properly.

Do you think my idea with the serial wire is worth a shot?

I'm not sure, what is a serial wire? It may be possible to rewire in this manner, but I'm still not convinced that the LED display is faulty. You could test the LED display with a 9V PP3 battery and a high resistance like 4.7kohm (modern LEDs will show some brightness even at low current), and just manually connect to the common anode (as shown in the datasheet) and the relevant cathode pin for the segments that you believe are faulty, with the rest of the board unpowered. Also, I presume you've checked that the solder joints to the display are healthy?

If the battery test shows the segments to work, then it's likely to be the control board which is (presumably) sending a serial data stream to the board to control the 7-seg display and all the surrounding LEDs.

Otherwise, if you're sure it is the 7-seg display which is faulty, you could ask the distributors of the 7-seg display for the cost of a new display.

The manufacturer has many distributors listed on their website.

Hi Jack,

Unfortunatley I was unable to find anything that would cross for the part you have. However, I can help you out a little. The Part# for the display is C/A303E G/W and it is made by American Opto Plus LED. Here is a link to the data sheet with the pin out. http://204.15.77.61/images/CA303E.pdf

Sorry I couldn't give you some better news.

Jason G.

Got it fixed. I tried to get in touch with AOP but they never responded to me. Ended up getting a LTD-M2806RI from mouser. I then used ribbon cable strands to route the board holes to the right Display terminals. Tucks the wires away and put it back in the housing and works like a champ. Hope this helps someone out in the future. If need be i can provide a schematic and step by step of how I did it.

Thanks for a the help.

Jack,

I am going to suspect that you have an AutoMeter A/F gauge.   I have the exact same problem  In fact, I have it times 2!   I bought the first gauge and it worked great for about 1 year then I started loosing segments.   The gauge as you know are about $400.  Well I was using this in a show car so I bit the bullet and bought another one.   Well it lasted just about the same length of time and it started doing the same thing but different segments.   So I feel your pain.  Gauge functions properly and the secondary LEDs are working fine so I agree with you on the statement that the functionality is working.  It also matches the readings on my diagnostic tools.

Now with that said, I am also looking to change the readouts.   I would very much like to see your diagrams or any information that you have regarding how you did this.

Thanks so much...

Victor

victor@myfoose.com

I found your direct replacement if you ever need one again.  Here is a little more information to help.

Your P/N was:

A303E-CL G/W

A signifies Common Anode. 

E designates color as Red High Efficiency.

G = Green, Y = Yellow, R = Super Red

Therefore the P/N equivalents would be A303X with X being any letter.  Looking at the specifications, the current and voltage differences are insignificant from a circuit functionality perspective for what we need these for.

The readout is a 3 digit, 24 LED.

Mfg: American Opto Plus

Pinout indicates no connection for pin 10.

Pin 1 starts Lower Left looking from top view of readout through the device

The direct replacement parts can be ordered through:

DComponents

www.DComponents.com

The readout cost was $3.36 each for the exact replacement and $3.31 for other colors.

Leadtime is about 4-6 weeks if they do not have it in stock. 

They had green in stock so I bought 3 and back ordered the exact parts.

Hope this helps someone else in the future.

My Application was for an AutoMeter A/F (Air Fuel) Ratio Gauge.  I had two of these gauges with defective readouts lasting only about a year each.  Expensive gauge at $400 each for the display to only last about a year.  It could be heat related since these gauges are often mounted in gauge pod housing on a dash or the A Pillar in a car.