Completely destroyed this fan driver

dandyrandy

dandyrandy

Well-Known Member
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?
 
Airwalker16

Airwalker16

Well-Known Member
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?
Click to expand...
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?
 
dandyrandy

dandyrandy

Well-Known Member
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.
 
Renfro

Renfro

Well-Known Member
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

dandyrandy

Well-Known Member
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.
 
Renfro

Renfro

Well-Known Member
Airwalker16 said:
So it won't hurt to just connect them together rather than leaving a pos and neg set just unconnected hanging there?
Click to expand...
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.
 
Renfro

Renfro

Well-Known Member
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.
 
Airwalker16

Airwalker16

Well-Known Member
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.
Click to expand...
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.IMAG0324.jpg
 
Last edited:
Renfro

Renfro

Well-Known Member
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.
 
dandyrandy

dandyrandy

Well-Known Member
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.
 
You must log in or register to reply here.
Top