Another issue....Fridge supply burnt out

Rjcamper

Rjcamper

Joined
Jul 26, 2019
Posts
479
Likes collected
557
Location
Devon / Cornish border
Funster No
62,726
MH
Mobilvetta Kimu 122
Exp
2019
Going to be one of those trips..........😠

Heading home, started to get a smell passenger side, couldn't see or hear anything, carried on got worse as we got within a couple of miles of home.

Open lid to fuse area, top cables red hot, allowed to cool and discounted, turned van back on and only fridge not working.

Fridge was on 12v for journey home, thoughts? Fridge was on max, always has been.....Pictures below
 

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Perhaps there was a loose connection between the red wire and its spate connector causing a bit of arching and thus the burning
 
New board, re-wire the plug, but could it be pulling to much juice? Don't want to try another board (board and plug below is scorched)
 
Rjcamper said:
New board, re-wire the plug, but could it be pulling to much juice? Don't want to try another board (board and plug below is scorched)
Click to expand...
Looking at the red it looks burned back up out of the plug. So for me the wire was over heating at the plug.

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Rjcamper said:
Ok, now how the hell do I find a replacement board for my mobilvetta kimu 122 2006
Click to expand...

if the board is not badly burned you may be able to get it repaired. there is a guy on fleabay that does circuit board repairs. i will see if i can find the link he did a fridge circuit board repair for me.

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this is the guy,

i know this is not your pcb but he does lots so may be able to help. does most by return.

www.ebay.co.uk

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It's the crappy Lucar type spade connectors, they get tarnished or slack over time which increases their resistance and then they are prone to overheating, especially when supplying the "highish" current for the fridge's 12 volt heating element. I had similar on my van which caused damage to the pcb. Apuljak Engineering sorted it out.
 
Thanks all, feel better now 😉🤗

All I need now is how to find a replacement to the cover of my roof rail in my other post
 
Clean any carbonization off the circuit board, check for dry joints, clean the terminal, cut burned cable back and fit new connectors, check the fit tightly and re fit.
 
Agree with jezport. Looks like a red-blue partial short, but in the plug or on the pcb? Be interesting to see pics of the pcb top and bottom in that area. My fridge takes 10A so around 120W - even half that would be enough in a small area to produce the damage without blowing the fuse (and mine's a 20A fuse!).
Still, on the plus side, you didn't have to crawl along the wiring looking for the fault, and it's not one of those intermittent faults that takes years to find! Good luck with the repair...

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The fridge draws a surprisingly high current about 5amps I think. The slighest resistance at the pcb connectors sets up heat which can either burn away at the pcb or more likely, cause the spade connectors to loose springiness. Gradually the connection deterioratesas the resistance of the terminal increases and therefore so does the heat. In the meantime of course the poor old fridge gets a lower voltage.
Often the biggest clue is a smell possibly of plastic or fish burning? Once you have smelt it, you will know for the future
Shouldnt be a problem to get the pcb repaired dending on how much damage there is to the tracks. Reassemble using new, tight connections.
MIke
 
UPDATE

Board out, thoughts on repairable? Pics below. Cut cable back and that looks ok, fuse looks a bit scorched as well
1_IMG_20210523_092800.jpg
0_IMG_20210523_092912.jpg
2_IMG_20210523_092752.jpg
 
Repairable. DIY depending on skills and when you next need to use the van.
You can see how the damaged tag has distorted and then te heat has spread along the pcb on the other side.
The connector is a standard one if you look around
More questions than answers I am afraid!
Mike
 
Looks easily repairable to me (after a mis-spent life designing and building the stuff!), if you can get the connectors. I'd go with mike and jezports posts - the solder on the back of the board looks cooked, needs a clean and the area checked for shorts to adjacent pads. If I ever take connectors apart I always give them a spray of Electrolube contact cleaner lubricant (just had a look, it says EML200F on the can) (works wonders on old radio volume controls!) - hope that helps, or maybe you all know about it anyway! I'm a bit surprised the fuse is discoloured though. It's what 20A and looks like an inch or so below the problem, I'd certainly replace it (with a decent one, not the chinese copies with steel links!).
 
Thanks all, if I knew I could buy a replacement I would have a go at repairing, but as it's discontinued think I will go with a professional 😉

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It may be worth trying this firm for a professional circuit board repair

Contact

For new or existing electronic design and manufacturing projects, talk to AR Electronic Developments of Staffordshire.
www.arelectronics.co.uk
 
Hi just read the first couple of posts, so sorry if I am now going to say has already been mentioned.

That was caused by poor connection from the wiring connector to the board connection. I know about these things as I have come across this so many times when I was working. So why did it happen, well if the connection between the connector and board is poor the current passing between the two has to work that bit harder, this creates heat and eventually burns out. This often happens in mains plugs or sockets as well, and can cause house fires. However, when this happens in your instance you need to cut off the burnt part of the wire, re-strip sleeve and fit new connector. The terminal on the board needs to be cleaned by using a flat needle file to remove all burn marks possible. When refitting the connector make sure it fits firmly, this should then prevent any future issues. Also visually check the board components near the connection just to check these have not been burnt out, but looking at your photo’s I would say these would be okay.

I used to repair domestic appliances and I have come across this so many times it was second nature to me to carry out this repair.

All the best
Flook

PS Just seen the white block on the pcb burnt out, not good sorry to say. If I was still working I would recommend a whole new pcp, why, because any repairs may still be susceptible to failure unless you get a minimum of a five year guarantee in writing from the repairer. Remember you paid a lot of dosh for your motorhome, so why take the chance on a circuit board repair.
 
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