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19: Neon & LED Channel Letters : 


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Need help with trouble shooting an existing install.
Posted by: GSSign (
Date: September 11, 2009 06:36AM

I posted this earlier in the LED Lighting forum with no replies.

I recieved a service call on a set of LED cahnnel letters. The customer stated that the letters are not illuminating bright enough. The letters are driven by (1) Advance 12V transformer. The LED's are labled 12V. All of the LED's are lighting consistantly dim. The voltage output under load is 11.9V. I removed the load from the transformer except (1) letter, the intensity did not change. The transformer temperature(by touch) is hot. The letters burn 24/7. The LED's are in a plastic blocks (4) Led's per cluster, aprox 22 clusters per letter with (6) 24" tall letters. The Advance transformer is a LED120VA0012V50F.

The customer e-mailed me a photo of the sign lighting properly at night when it was first installed. It looked good in the pic, but I have not seen it personally at night.

This is a new customer, the sign is only a year old, but the compay they purchased it from is out of business. The sign is 50+ miles from my shop. I do not currently inventory LED components.

The supply voltage is correct, 113V.

Is the transformer likely defective even though it is producing the correct voltage while under a load.

How do you correctly load a LED transformer?

It is a 60W or 5A output. Do you use a amp guage to load it?

What percentage of the 5A can be loaded?

I need to complete this job correctly and as soon as possible.

Can someone please give me a quick 101 on trouble shooting this set of LED's.

Thank you.

Re: Need help with trouble shooting an existing install.
Posted by: geraldi (
Date: September 17, 2009 04:08PM

What brand are the LED's? How many led's are used in the sign? How old is the sign? It could be cheap led's. They will loose brightness over time. Some faster than others.The power supply is probably OK.

You should load a 60 watt power supply about 48 watts or 80%.

You can find out the brand of led and go to their web site and see how many watts each module uses and mutiply that by the number of led's.

my email is: if you have questions. Why is it on 24 hrs a day? Sell them a photo cell or timer.

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