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Siemens KI40FP60/11 refrigerator - need schematic or help with driving the inverter

paszczakojad

By paszczakojad
in DIY Appliance Repair Help

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paszczakojad

paszczakojad

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Hi,

I have Siemens KI40FP60/11 refrigerator and the compressor is not working. I replaced both compressor and inverter, but that didn't help. There's no output from the inverter (the board is powered up, both 5V and 15V are present, the termal fuse is connected). I checked the input of the inverter and the signal is strange (negative half of sinusoid) - that couldn't drive the input optocoupler in the inverter. So I suppose the main board gives wrong signal, but there's no direct connection between mainboard and inverter (cable colors are different and I checked connections with a multimeter). So perhaps there's another device in between. Or maybe one wire is damaged? The service schematic would be the best help...

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