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Treadmill board component burn repair

Tansmile

New Member
Hi
I hav treadmill board burned. There are 2 component burn out and i am looking for replace it.However, i am not sure what is the value of the components, can anyone expert advise here? Thanks in advance.
20220304_085304.jpg

The 2 components labeled as RS1 and TH1 burned look like seramic caps. They are connected to rectifier KBPC3510N.


20220227_162244.jpg

The treadmill board is KPT451Driver ver2.1 2008/12/13.

I need helps to identify the component RS1 and TH1 and thier values.

20220304_085321.jpg
 
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danadak

Active Member
Cause has to be established. The large cap is bulging at top which suggests
it needs to be replace. That could have caused a short and taken out bridge,
square package with 4 lugs on it. I would also check power fets bolted to heat-
sink.

The disk shaped part probably a varistor or MOV, try to read the part labeling
on its side. Its a transient V protector for circuits.

Try to get a schematic for it and post that so forum can give you additional guidance
on what to check. Or hand draw one.

Regards, Dana.
 

augustinetez

Active Member
Might be just the picture angle but that cap looks fine to me.

There is an earlier version of that pcb on Aliexpress but no clear shot of the values of the components.

I suspect the bridge rectifier is shorted which has taken out the MOV, possibly a cap and the fuse.
 

danadak

Active Member
The large cap look like either of these ?

1646395817428.png


1646395841116.png


Also any of the smaller caps look like this -

1646395992477.png


The above all suspicious.


Regards, Dana.
 

Tansmile

New Member
Thank you for responce.
Yes, these burn mark having these 2 components burned. I think they are Ceramic caps, but i dont know the value.

If anyone experts in Rectifier design and can give a guess on these 2 components value. I tested the bulk caps is fine and the rectifiers also good..
 

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danadak

Active Member
Thank you for responce.
Yes, these burn mark having these 2 components burned. I think they are Ceramic caps, but i dont know the value.

If anyone experts in Rectifier design and can give a guess on these 2 components value. I tested the bulk caps is fine and the rectifiers also good..

I think those are MOVs, not ceramic caps......

How are you testing the caps ?
 
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Tansmile

New Member
Try my best to draw part of the schematic from the circuit board.
 

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rjenkinsgb

Well-Known Member
Most Helpful Member
I suspect either TH1 or RS1 is in series with the input to the bridge rectifier, as an inrush current limiter?
 

klody_1977

New Member
Hi everyone, I have the same problem the 2 ceramic capacitors have exploded, you can read something but I'm not an expert, if someone can help.
P_20220524_175138.jpg

P_20220525_181246.jpg

P_20220525_181318.jpg



as soon as I can I try to unsolder it and post a better photo.
 

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