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I bought a used CTB16 after Christmas last year from a guy who was moving. I was smart enough to test all of the channels (on and off in HU) before i bought it but now that i have everything connected it seems to be acting up. Channel 10 would be on all the time, even when not connected to HU (cat 5 unplugged from controller). I brought the unit in the house and did some testing with a multimeter, and it seems that that i have 4 channels that are receiving constant power as soon as the controller is plugged in. Channel 4 has 0.1v, channel 7 has 19v, channel 10 has 91.3v, and channel 15 has 1.7v.

Is this something that can be fixed or should I just be ordering a new board? BTW the guy did mention that he had to change one of the triacs the year before, but said it was repaired and was in proper working order. He gave me a little bag with what I believe are spare triacs.

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31 minutes ago, stunney said:

I bought a used CTB16 after Christmas last year from a guy who was moving. I was smart enough to test all of the channels (on and off in HU) before i bought it but now that i have everything connected it seems to be acting up. Channel 10 would be on all the time, even when not connected to HU (cat 5 unplugged from controller). I brought the unit in the house and did some testing with a multimeter, and it seems that that i have 4 channels that are receiving constant power as soon as the controller is plugged in. Channel 4 has 0.1v, channel 7 has 19v, channel 10 has 91.3v, and channel 15 has 1.7v.

Is this something that can be fixed or should I just be ordering a new board? BTW the guy did mention that he had to change one of the triacs the year before, but said it was repaired and was in proper working order. He gave me a little bag with what I believe are spare triacs.

You have bad triacs. I would worry about 7 (not that good)  and 10 (BAD). 

Be sure to put a small load on each (a 4W  Incan nightlight) when you measure.

FWIW, newer (gen3) added the small load needed because LEDS draw so little. There  manny threads Keyword Snubber

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i agree with Ducks on everything he has mentioned, and also add, that when triacs fail the most common states are full on, or no on, HOWEVER they can fail in the gate portion, where they are on "just a bit" ... the load when testing, even a nightlight that has a real bulb (non LED) is worth it's weight in gold, when doing diagnostics.....

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Thanks for the replies. I did not have anything connected when i was doing the testing. The board says CTB16PCG2 in the top left hand corner. I assume it is a Gen 2 board then? I thought it was a gen 3 by the location of the jumper pins when i tried resetting it.  So i guess i will retest with a snubber.

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4 minutes ago, stunney said:

Thanks for the replies. I did not have anything connected when i was doing the testing. The board says CTB16PCG2 in the top left hand corner. I assume it is a Gen 2 board then? I thought it was a gen 3 by the location of the jumper pins when i tried resetting it.  So i guess i will retest with a snubber.

When you run HU, it tells you the basics about the controller.

ID - Type Ver of FW

My gen 2 run 4.40

My Gen3 runs 1.08 (there is a 1.09)

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Thanks ducks. So if its a Gen 3 i should not have to use a snubber?

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37 minutes ago, stunney said:

Thanks ducks. So if its a Gen 3 i should not have to use a snubber?

Correct. But there are always exceptions, so keep a night light or 2 in your took kit for troubleshooting. Cheap strings are more likely to give issues.

(I run 13 Walgreens strings on a Gen 2 without issue and no snubbers. YMMV. Try, and just be prepared if you need to snub)

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I am going to walmart to find some night lights right now. Do I need the snubber if i am just testing with a multimeter at the board itself or is that just for testing the controller with HU when all the strings are plugged in? Thanks again for the help!

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53 minutes ago, stunney said:

I am going to walmart to find some night lights right now. Do I need the snubber if i am just testing with a multimeter at the board itself or is that just for testing the controller with HU when all the strings are plugged in? Thanks again for the help!

The snubber INSTALLED anywhere on THAT channel is part of the test-cure

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I had the bad triacs replaced on the board but still having issues with lights staying on. I built some snubbers with 47K 1watt resistors but the lights are still on. Retested the snubbers with a multimeter and confirm 47k ohms so the snubbers are good.  I am stumped. To recap:

Channel 3 has 7 strings of lights total, 1 string is staying on approx 10%

Channel 7 has 7 strings, 1 string stays on at 40%

Channels 8 and 9 each have 1 string that stay on approx 10%

All strings are the same - NOMA quick clip LEDs from Canadian Tire. All strings have 25 bulbs per string. I tried unplugging each affected string and reversing the polarity but that didnt make a difference. One thing I did notice, when i plug 3, 8, or 9 back in, they flash at almost 100% for half a second then drop to the 10%.

Any suggestions? Or should I open a ticket with LOR if I dont know that its a controller issue?

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On ‎12‎/‎3‎/‎2018 at 12:36 PM, stunney said:

Thanks for the replies. I did not have anything connected when i was doing the testing. The board says CTB16PCG2 in the top left hand corner. I assume it is a Gen 2 board then? I thought it was a gen 3 by the location of the jumper pins when i tried resetting it.  So i guess i will retest with a snubber.

What status light does it have? 

There was a batch on gen3's sold that have gen 2 stamps- I have 4 of them. Status light and or when you connect to it and find it in the HU it will tell you the truth.

JR

Edited by dibblejr

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It's one of those Gen 3 with gen 2 stamps. HU says its a gen 3.

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The snubbers are 4. (point) 7 k (as in 4700 ohms) properly said as 4k7 3W 10%  the resistors you currently have are not doing anything to remove the capacitive effect...

Greg.

Ohms law 4700 ohms at 120 volts yields 3.06 watts or 0.025 of an amp (note the point in there) or just over 2/100's of an ampere, 50 snubbers ALL on, would take just over 1 amp of electricity, or roughly 2 of a 60 watt  bulb

Edited by a31ford

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9 minutes ago, stunney said:

It's one of those Gen 3 with gen 2 stamps. HU says its a gen 3.

Yes, it is. I was ensuring you knew this fact since I just came across this in my email and seen your Dec 3 post where you thought it is Gen2. 

I had 5 but one of them just quit working. I was going to send it to LOR for diagnostics beyond what I could do however I had another controller go down and needed parts. I cannibalized the bad one. The one I fixed with it has been working for almost 2 years, Figured I got my monies worth. 

JR

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Greg, I'm so confused. 4700 ohm? Really? Every article i read about snubbers says to use 33k - 47k 1 watt 5% resistors, including chuckd's post on the planet christmas forum. By no means am I saying youre wrong, I am really only familiar with basic 12v wiring. i'm very confused and frustrated with this problem. I'm almost ready to call it quits for this year if i cant figure this out

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The value of a snubber is EXTREMELY non-critical.  One of the common recommendations is a incan night light bulb or a C7 incan.  Both of those are around 4 watts, so not far from Greg's number.  You could put a 60watt bulb on there and it would work just as well.  I've also seen the 33k - 47k number.  That also likely would work.  If a given value does not work, go for a lower resistance.  If using a resistor, make sure to calculate the power (heat) produced FIRST - Ohms Law.  One advantage of using a light bulb is that they are already designed to operate on 120VAC so you don't need to worry about the power.

 

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I also tried plugging in a short string of c7 incans and it didnt make a difference.

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I agree with Jim, the value is really not important (10k ohm will also work, however, 47k 47,000 is just a bit too high in resistance,) the type of thermo plastic used on strings  now days is quite different from even 5 years ago, and the capcitive loading is even greater.

14k0 14000 would be just over 1 watt  (1.02)

HOWEVER, if you have also tried an incan string, and the problem persists, i would say your problem is elsewhere.

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