Samsung Rsh7znrs Inverter

[daveey]

Having trouble getting a Samsung Rsh7znrs Inverter. Espares and British gas home repairs draw a blank since the footprint and connections are different on the boards they supply. Mine is a green pcb all ones provided are traditional brown colour and whilst mains wires are same the ribbon to main board on mine is 4 wires as opposed to six on the available boards. Options are (1) change the intelligent PSU controller on board chip ( in progress), (2} try to use 4 of six connections from available brown invertor (3) try a board not specified for my model but looks identical to mine both top and bottom side for other Samsung model …… any ideas please as nothing on eBay either and it’s been out of order one week now.

[electrofix]

if its this one its listed by my supplier as no longer available. there may be a mod but you would need to find someone with tech access to check

Dave

[daveey]

Dave. Thank you so much for reply. And yes that’s the one. I have removed the 27pin smart power module ic (under the silver heat sink) near the compressor outputs and just waiting for replacement to drop in the letter box before soldering in and re trying. If not will need to know the Vdd voltage of my board as the available one listed for my fridge has 6pins difference a 13.2 v output and a 5v line. May just need to use one but don’t know what voltage my board was producing.

will keep post updated

[daveey]

here i go with the update…so i gave up with the soldering iron, i actually purchased a brand new invertor PCB from a company which is identical to my unit, however this displays a single flash code error on the invertor topside LED, my old invertor board has 5 flash code error but not sure what the original board flash code was when this all started before i started changing IC’s . So now thinking is this a compressor fault, or mainboard at a push. The compressor coils measure 10 ohms. i know samsung want £99 labour and parts on top but currently the cabinet is 9 years old so the compressor is covered under parts warranty if that is the fault….. its a gamble…. what i did was speak to a british gas engineer who originally drew a blank cause he couldn’t get a PCB, his view is the compressor cannot be change due to diverter valve stopping the bleeding and that if faulty Samsung replace the fridge under warranty if the compressor fails inside 10 years….. any help, confirmation or advice appreciated. Thank you

[electrofix]

have no access to samsung tech so dont know about flash codes

there are 1 or 2 service manuals on manualslib but not an exact match to yours

Dave

[daveey]

So I got the circuit for main board and the 5v and switched transistor ground is correctly sending the start compressor voltage to the invertor board. I can get the output from main board to toggle if I I enter diagnostics and enter FF and DF to force compressor on and off. The compressor measured at 10ohms between all three phases when measured from the invertor connector and the overload thermal switch is closed. Trying to measure voltage output across the compressor wires at the invertor end of the cable has zero DC volts. I haven’t tried to measure voltage out of the inverter board without the compressor plugged in as concerned the board could be damaged with no load attached. It’s definitely a weird one with the signal being received at the invertor and the compressor measuring out at 10ohms per winding. Could be an overload protection built in to the output device on the invertor if the compressor is kaput. Any thoughts from anyone appreciated. The Samsung labour cost is £99 I hear if it is a compressor fault it’s covered by 10year warranty so could be an option but want to be sure it’s compressor beforre I open myself to their astronomical charge.

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