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-   -   need to identify a part from my outdoor lights (http://www.diychatroom.com/f18/need-identify-part-my-outdoor-lights-125825/)

robkiller 12-06-2011 08:34 PM

need to identify a part from my outdoor lights
 
I have the following lights but a part keep failing. I am not able to id the part to replace it. Below are some pics if anyone can help me please do.


On the board its part R66http://www.diychatroom.com/members/r...4872-light.png

http://www.diychatroom.com/members/r...full-borad.png

http://www.diychatroom.com/members/r...1-08-756-1.jpg

joecaption 12-06-2011 08:36 PM

So just buy a new sencer, there sold in Lowes and Home Depot.

brric 12-06-2011 08:37 PM

It is a resistor. How do you know "it keeps failing"?

joed 12-06-2011 08:47 PM

Resistor don't fail. Some other part failed and cause too much current through the resistor.

robkiller 12-07-2011 12:16 AM

It is burnt and had chard marks on the bottom of it. Thatís how i know itís no good. Good point i never thought about it not being that part that failed but the part that took the result of a failing part.

The new ones are like 25 plus dollars and i have 5 of these around the house. I was hoping to buy a dollar part for each and just fix them.
:(

zappa 12-07-2011 01:09 AM

Quote:

Originally Posted by robkiller (Post 787942)
It is burnt and had chard marks on the bottom of it. That’s how i know it’s no good. Good point i never thought about it not being that part that failed but the part that took the result of a failing part.

The new ones are like 25 plus dollars and i have 5 of these around the house. I was hoping to buy a dollar part for each and just fix them.
:(

Joed is right and something else on the board may have failed. You might want to check for recalls as there is likely a design problem with that board.

robkiller 12-07-2011 03:17 AM

I agree it should have one since every one of my 5 failed. I got it at sams club just over a year ago but i cant find them or who makes them. So I am out of luck without knowing who makes them. But thanks for the input everyone. Looks like it is the expensive way.:furious:

frenchelectrican 12-07-2011 04:25 AM

The biggest killer with the motion sensors is the surge that useally do it.

I useally buy RAB luminaries for motion sensors they genrally little more expensive but not super senstive to the surge { but it can happend but not as quick as unnamed cheap brands will do } not all big box store will stock this but electrical supply sure most case they will have it on stock.

Merci,
Marc

dmxtothemax 12-07-2011 04:49 AM

It looks like part of the power supply,
On of those diodes could be faulty,
I suspect they are zener diodes and the resistor
is used in association with the zener, so if the zener fails
then the resistor burns up.
If you can find out the value of the resistor you could replace it.
Can you look inside another working unit ?
Then note the color code.

dmxtothemax 12-07-2011 04:50 AM

It looks like part of the power supply,
One of those diodes could be faulty !
I suspect they are zener diodes,
and the resistor is used in association with the zener,
so if the zener fails then the resistor burns up.
If you can find out the value of the resistor,
you could replace it.
Can you look inside another working unit ?
Then note the color code.

robkiller 12-08-2011 06:08 AM

I have checked the all the parts of the board but the relay. I am thinking it may be the relay. I am going to wire it up when i get time and test that thought.

zappa 12-08-2011 06:17 AM

Quote:

Originally Posted by robkiller (Post 788789)
I have checked the all the parts of the board but the relay. I am thinking it may be the relay. I am going to wire it up when i get time and test that thought.

A relay wouldn't cause that resistor to burn up. Prolly a shorted semiconductor on the board.

dmxtothemax 12-08-2011 05:18 PM

Quote:

Originally Posted by zappa (Post 788800)
A relay wouldn't cause that resistor to burn up. Prolly a shorted semiconductor on the board.

Most likely one of those zener diodes is faulty,
Which means the current limiting resistor copps
the full rail voltage across it !
Or it could be a case of marginal power rating
of the resistor.(very common in cheap equip')

What are the numbers on the diodes ?
(the glass beads)
This will tell what there voltage is !

robkiller 12-11-2011 06:59 AM

I am not home but will look that up asap tommorow. :)

robkiller 12-13-2011 09:09 PM

One of the bigger ones is 1N4742A

1n474 is all i can read but on the one in the pic but, i think it is also 1N4742a also.
I have been doing some testing and it seems like whatever i lost has made it so i donít have the low voltage in the circuit. The chip LM324N does not have the required power. It appears that the circuit is working off of AC current and does not change it to dc that i can tell unless thatís the part I have lost.

Thoughts? I am bound and determined to get this figured out because itís a challenge.

Thanks for the help any new ideas would help.


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