My shop owner friend only had a few types of machines in stock. Probably all other manufacturers also use the same type of low standby LNK or similar chip in the primary circuit to save on electrical energy when they are switched off. And only a few have used modern solid state relays instead of the old cheaper electromagnetic relays.

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Best regards, Albert.

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I understand that your friend obviously fixes these machines on a daily base Parasuraman. He likely must be dealing with one kind of brand when no board from other manufacturers will fit, if he uses only one prepared dummy machine. Until now I never needed to open any thick film or non-conductive or noncorrosive paste. The replaced components didn't have any paste. And removing defect components in the AEG machines by desoldering them is very easy. Drilling holes would probably only mean more work and could damage the (often varnished) controllerboard. Cheers!

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One of my technician friends does regular servicing washing machine boards, A/C control boards etc. He has set up a dummy washing machine load for checking the board keeping it on table. I have seen him doing it with such an ease, it is an awesome sight to watch. He shorts the door lid switch, and gives some bulb load etc. which I am not able to explain thoroughly. In face I give my washing machine boards to him and get it serviced. He has all the tools and other things required to open the thick film of non-conductive and noncorrosive paste and reapply after finishing the work. He is such an expert that he makes holes on the top only for removing the defective component!

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PS: Tina designer Suite has many interesting options like the Analysis menu options : Transient and/or AC or DC analysis. Which draws automatically the excitations of any Circuit designed (drawn or made by input with the Tina Interpreter). In a wavediagram all voltages present over a preset time can be watch and saved. With this menu function it was easily possible to see that my first circuit with 3 depletion mosfets worked like the second circuit with only 3 enhanced mosfets did (enhanced like in the LNK internal circuit on the FB pin). And that they were each others exact opposites concerning their voltage levels. Were the Depletion mosfets voltage wave levels were descending the Enhanced mosfet voltage levels were rising and vice versa. Without this great function it would be very difficult to grasp the function of a designed circuit. And although Tina has many components in its database, the LNK 304/305 chip is not available (yet?), why I am trying to simulate it in Tina.

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