Completely destroyed this fan driver

The 0 ohm components or fuses each go back to one of the bridges. The go to the switching transformer primary circuit. One probably actually goes to a switching transistor then to the transformer. The line looks like it should go to both. Possibly it's for Daisy chaining?

dandyrandy said:

The 0 ohm components or fuses each go back to one of the bridges. The go to the switching transformer primary circuit. One probably actually goes to a switching transistor then to the transformer. The line looks like it should go to both. Possibly it's for Daisy chaining?

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I think they were all connected to AC side and DC side a bunch of ways. So how do I wire it to just one AC input? Both pos and negs to the single plug wires?

Haaaaaa and POP . . . You let the magic smoke out!!!!

dandyrandy said:

View attachment 4274255

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Dots are showing what? I'm pretty sure I should just hook up both the positives and both the negatives together in pairs .

The white spots I wiped are the connection I believe where the rectifiers are parallel it appears. It would be nice to measure the resistance between the inputs to see if connected on board. But I would try one. Shouldn't need both. A little trick I used to use is wire a lamp in series with the device under test. Sixty watt in series will limit the current to what it takes to light the lamp. 100 watt ~ 1amp. Instead of parts flying it just lights the lamp.

Airwalker16 said:

Dots are showing what? I'm pretty sure I should just hook up both the positives and both the negatives together in pairs .

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They actually may already be connected. I'm old and type slow.

Kinda odd, looks like two bridge rectifiers and two inputs. Not sure why. Would be nice to see how they were originally connected to AC input, why they have two pairs of AC input wires.

dandyrandy said:

They actually may already be connected. I'm old and type slow.

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So it won't hurt to just connect them together rather than leaving a pos and neg set just unconnected hanging there?

I'd pick the corner and pop 120 v to it. Got a small fuse? When working for a machine tool salvage company once my buddy and myself would put on a welding Helmut with auto dim and watch the mag panel when turning the power on. Find out where to put the smoke back in.

Airwalker16 said:

So it won't hurt to just connect them together rather than leaving a pos and neg set just unconnected hanging there?

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If you could measure the resistance I'd feel better. I'd try one. The other may be AC out for the next supply. Maybe

Airwalker16 said:

So it won't hurt to just connect them together rather than leaving a pos and neg set just unconnected hanging there?

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I dislike the fact they used RED / black wires on the AC side. There is no positive and negative on an AC feed.

My GUESS would be to match colors and pair up the two sets of wires on the AC side, but I am at a loss why there are two sets of inputs.

To really give any reasoning on the input id need to have it on a bench to check or at least see how and what they were originally wired into. Just doesn't make much sense.

Renfro said:

Kinda odd, looks like two bridge rectifiers and two inputs. Not sure why. Would be nice to see how they were originally connected to AC input, why they have two pairs of AC input wires.

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I do still have THIS pic I took on that fateful day but it doesn't really show much... you cant see the driver but its right next to the black one in its original position right there in the back.

Perhaps one of the AC pairs went to the LED driver???

Id apply input AC power to the DB1 corner pair thats by the split cut in the PCB.

The pair I boxed in red is my GUESS on AC input

Renfro said:

Perhaps one of the AC pairs went to the LED driver???

Id apply input AC power to the DB1 corner pair thats by the split cut in the PCB.

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If I remember right I think it did. What's that mean?

I agree. It appears a jumper may connect the two. My upload here sucks and can't seem to get it to cooperate. Living in the sticks. The split on the corner. One on each side. And duck.

Airwalker16 said:

If I remember right I think it did. What's that mean?

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Just wont be using that pair.

Renfro said:

The pair I boxed in red is my GUESS on AC input

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Thank you. My internet sucks...