[KBCFC]

Re: 9v at compressor – pcb failure ?

Hi Bob,

Thanks for your info and time to reply again.

At the bottom rear of the unit I have a connector block, on the underside of the fridge area and mounted above the rear compartment, so like it’s on the ceiling of the rear compartment, if you will. I presume it is feed straight in from the power supply from the top PCB/mains to the compressor area.
In this area, I have the connector onto the plug coming from the mains/pcb. From there I have a 5uF capacitor, from there it goes to the PTC relay/thermal overload which fit onto the 3 relay pins. The capacitor, thermal overload and PTC relay are on the one harness effectively, which go from the power into the area to the compressor to feed the compressor with it’s power. On the right hand side of the compressor is the cooling fan. This works fine. To the right of the fan are the “cooling coils”.
That is all there is in the bottom rear compartment of my particular unit. I don’t have any other pcb items that are visible anywhere.

The mains power lead comes straight into the small pcb on top of the unit – the noise filter I think, for the part number on it being “Googled”.
This goes in at 240v and comes out at 240v (tested tonight on DMM) and then disappears into a hole in the top of the fridge, so presumably into the hidden area at the back of the unit.

I don’t actually know that my pcb has failed but I think I have tested all the sensors in the fridge and freezer and they would appear to be functioning OK. I have tested them for variable resistance from room temp, to being in ice water, to being in hot water and I get the variable resistance working OK through the range.
The compressor windings check out as they should by measuring the resistance across the 3 pins (30Ohm / 14Ohm / 16Ohm) so I think the compressor is probably OK.
The heater in the freezer gives me a resistance reading of 170 Ohms. It is not open circuit and I guess that the resistance readings means it is functioning OK.
I have the fridge fan running, I have the freezer fan running, I have the compressor fan running, I have the LED display panel running, all of these are functioning OK but I am not getting any power noise from anywhere on the compressor circuit parts housed in the bottom rear of my fridge.

I have called a few local refrigeration engineers but none of them are willing to look at any Samsung machines !

I did buy a new PTC relay as I though it should be a 33Ohm unit. That is what is says on the data sheet for the part and it is also included in the code of the part (PTHTM33OMD3) I get 1500 Ohms across it’s pins. I had 1700 Ohms on the original one, so I wondered if the PTC relay was too high a resistance but really not sure as the new one came with a similar resistance to the original one. What they should read over 1500 Ohms when the part is listed as being a 33 Ohm unit I can not work out or find any information to help me rule it in or out as a possible issue with my fault. I think that as the new one has a similar resistance to the original one, I am guessing that they are both OK but not sure.

I have no knowledge of the workings of these units.I have learned all that I have through the web. I am now at the end of my limited skills in being able to be sure that the pcb is the failed part or to be able to identify that anything else is the cause of the failure of the operation of the compressor.

If you can add anything else that might help me further I would appreciate it once again.

Many Thanks
Kevin

[KBCFC]

Re: 9v at compressor – pcb failure ?

Hello Seamy & SAMURI,

Really appreciate you both taking the time to post your advice to my question.

I don’t think my Samsung RSA1WTMH unit has an inverter system on it.
I have 2 PCB’s on top of the fridge freezer unit.

One is small one where the 240v mains come into first. I have looked up the part number and it appears to be just a noise filter/EMI filter.
The part number of this PCB is DA27-00019A.
I have images of my actual board but can not upload them here unfortunately.
I have copied a website in below where you can view the identical part.

https://www.samsungpartsnl.com/samsung- … 00019a.htm

The main PCB is part No. DA41-00532D.
I have images of my actual board but can not upload them here unfortunately.
I have copied a website in below where you can view the part.

In fact the link below shows the exact same 2No. PCB’s as I have on the top of my fridge.

https://www.samsungpartsnl.com/samsung- … 00532d.htm

There is no led to be seen and no inverter system, as far as I can see ?

To be honest I am struggling to find much information about my model and it’s parts. There is a load of info on the RS21 types which preceded my unit and where there a lot of well known faults for those but my one seems to be one that doesn’t have many issues as I can’t locate much on it.

I did list a fully detailed question that you will see on the forum fro ma few days ago but have not had any responses to that (possible a bit long winded but does fully explain the problems my unit has) so I thought I would break it down into one off parts to try and get some advice to help me further.

I am tempted to buy a new main PCB but I was hoping to try and rule it in in some way before doing so.

Thanks for your help to date
Kevin

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