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Led dusk to dawn repair

Mohntr

New Member
I was wondering if someone could tell me basically how this circuit works. I dont see a bridge rectifier. It's a 94 v pcb it says, 110v in. The light was very dim and finally wouldn't light at all. 140 or so little square leds. Thank you.
 

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JimB

Super Moderator
Most Helpful Member
They are inductors.

JimB
 

Nigel Goodwin

Super Moderator
Most Helpful Member
I was wondering if someone could tell me basically how this circuit works. I dont see a bridge rectifier. It's a 94 v pcb it says, 110v in. The light was very dim and finally wouldn't light at all. 140 or so little square leds. Thank you.
Many of the components are on the other side of the board, and probably the rectifier is. So post a picture of the other side.
 

Les Jones

Well-Known Member
I think the board is a switch mode constant current power supply for the LEDs. I think the bridge rectifier is the square component with 4 pins on the etch side of the board. (About the bottom middle of the picture in post #6) I think the mains comes in to the top part of the board that is cut off in the picture in post #1. It then passes through a common mode filter (The thing on the component side that looks like a transformer with the windings visible. ) on route to the bridge rectifier input. If you trace out the schematic of the board we would have a better idea of how it works.

Les.
 

Mohntr

New Member
Thank you! I bought it new 2 years ago, I can't find the papers on it. Thought the rectifier would be bigger. There is a LDR on top of the light.
 

Mohntr

New Member
I think the board is a switch mode constant current power supply for the LEDs. I think the bridge rectifier is the square component with 4 pins on the etch side of the board. (About the bottom middle of the picture in post #6) I
Less when you say trace out the schematic of the board, what exactly do you mean? Thank you
 

Les Jones

Well-Known Member
I mean draw a circuit diagram (Alternative words for "schematic") by following the connections between components on the board. Your board looks to be a single (Or possibly a 2 layer board.) so you can see all the copper tracks between the components. sometimes it can help to do continuity tests to confirm connections to closely spaced through hole components. If there are more than 2 layers it is much more difficult to trace the connections as you can't see the tracks of the layers within the board.

Les.
 

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