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Re: Whirlpool American Fridge Freezer broken down – help!
My (2002) S25B RSS31 decided to develop a flashing control panel, the speed of flashing varying depending on whether it was in vacation mode, normal mode or with the light on. Compared to a lot of you, I seem to be lucky, the machine is still chilling correctly although I’ve never hooked up a water supply so have no idea if that side of things has ever worked.
On opening the machine and checking around with both a regular fluke capacitance meter and a cap ESR checker, it appears that the electrolytics are all ok, but a number of the polyester / polyprop caps are way out of spec. On the back board, one of the four 0.22’s was half the spec’d value and the 1uf was just over 0.5uf. On the front board, the four caps in parallel (1×0.68 + 3×0.47) should total approx 2.1uf but mine came in at around 0.7uf TOTAL. The 0.33uf on the front board is within spec.
I tried swapping the caps around on the back board but it made no difference in my case, so switching attention to the front board, I stole the 0.33uf cap from it’s circuit and piggybacked it onto the other four .. the flashing display stopped. My theory is that the power supply is so weak that the microcontroller on the front board on my machine is in a reset loop. Once I find the datasheet for the microcontroller I plan on checking supply voltages (5v?) before and after repair.
I now have a bag of capacitors from RS .. the 10 polyprop / polyesters will be replaced with all the electrolytics! Hopefully this will fix it.
Does anyone have a service manual for this beast? Does it have the PCB schematics in it? It’d be a lot easier working out what is going on without tracing the board.
