Replacement transformer for Samsung fridge

[unimatrix93]

Dear forum

My Samsung fridge died from a fault on the mainline and the transformer (https://www.hqelektronika.hu/hu/halo...-w8-da2600009k) died.
No voltage on the secondary, measuring resistance shows open circuit. I concluded a blown fuse which is deep inside the transformer, I don't think I can disassemble it to replace the fuse.

The second problem is that I cannot find an original replacement part anywhere or even If I do it's pretty expensive.

My question is: Can I replace this transformer with a generic 230V to 17V one? The output has 4 wire and most that I can found on local suppliers like TME has only 2 like this one: https://www.tme.eu/hu/details/tszzba...szzba-65-002m/

Thanks in advance!

[CapLeaker]

Huh? The heat fuse is in the primary, not in the secondary side of the transformer. I highly doubt the secondary is open. Check that transformer again.
Doesn’t matter what you put in order to replace it as long as you get the voltage you need to all the voltage rails. Probably the low voltage AC gets rectified into DC on the board the secondary of the transformer plugs into. Let’s see… 16.5VAC x 1.414= 23.3VDC. I suppose you could take the rectifier diode out and place a 24VDC switching power supply. Possibilities to do a hack, no problem. You just got to understand the circuit.

[Agent24]

If it has 4 wires it probably outputs two different voltages.
If you analyse the circuitry it connects to, you can probably guess what the other voltage is supposed to be.
Then you could probably replace it with two different transformers supplying each the different voltage.

[unimatrix93]

After some digging I found the diagram of the fridge:


It looks like it produces 16.5V and 13.5V on the two secondary.

[CapLeaker]

So one rail makes ~24VDC and the other around 19VDC. I guess there must be some rectifiers on the main board. However, it may be easier to fix the thermal fuse in the transformers primary, unless you got a PSU that outputs 24V and 19VDC simultaneously.

[Agent24]

You have to be sure there's nothing using the 60Hz AC signal from the transformer as a time/clock reference or something too, if you decided to use a DC power supply instead.

If you can't fix the transformer, two separate ones should work too.

Also have to wonder if some fault on the main board overloaded and killed the original transformer.

[unimatrix93]

You have to be sure there's nothing using the 60Hz AC signal from the transformer as a time/clock reference or something too, if you decided to use a DC power supply instead.

If you can't fix the transformer, two separate ones should work too.

Also have to wonder if some fault on the main board overloaded and killed the original transformer.

I see, thank you for your input.

Can I use these two transformers?

https://www.tme.eu/hu/details/ts10_3...ndel/ts-10-30/
https://www.tme.eu/hu/details/tszzba...szzba-19-001m/

[unimatrix93]

So one rail makes ~24VDC and the other around 19VDC. I guess there must be some rectifiers on the main board. However, it may be easier to fix the thermal fuse in the transformers primary, unless you got a PSU that outputs 24V and 19VDC simultaneously.

Well you are right about the thermal fuse, but the problem is that it seems its buried deep inside the transformer, I don't think I can disassemble it to get to it.

[CapLeaker]

Well you are right about the thermal fuse, but the problem is that it seems its buried deep inside the transformer, I don't think I can disassemble it to get to it.

Just give it a try. It’s broken anyways…