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  1. M

    Whirlpool L1373 repair attempt

    Had another look at the machine yesterday and it seems that somehow the magnet had come loose from the motor, I glued it in place with resin and it seems fine now. Dirty fix but apparently there is no way to replace that magnet as the manufacturer does not sell it separately.
  2. M

    Lets go into my induction stove

    To measure amps you need to either put your meter in series with the mains line, or use a clamp meter. If you connect your meter in series make sure it can handle the load, this is tricky especially when you have possible shorts. You should be able to single out the zones at the connector...
  3. M

    help finding data on this IC

    Right, so it just needs to be rated to pass enough current then? I probed the drain pin and did not see a PWM signal there. It's getting 30V DC. The optocoupler read 0v DC.
  4. M

    Did I get shocked by my TV power supply?

    I've heard of people being sick after an electric jolt. Symptoms are akin to a stomach bug like sickness, feeling weak, vomiting, cramps. If you're unsure, just see a GP.
  5. M

    help finding data on this IC

    The way i understand this chip is that it's a switch, just like any other transistor, but with added features. It has a current output, ie it passes current through it, so it has a max output power, right? So my questions/concerns about it are as follows: - Frequency: mostly i see these chips...
  6. M

    help finding data on this IC

    I'm thinking about replacing it with the TOP242R, has a 15 watt output and selectable frequency of 66 or 132Khz. The sheet said it takes AC input but the reference design includes a full wave rectifier so, considering the psu has a full bridge rectifier i think i'm solid, that is if the...
  7. M

    help finding data on this IC

    Hey, I can't seem to find any data on this IC. It's a frequency generator for an SMPS, but i'm not sure about it's output, frequency, power etc. I'm looking for a replacement as this IC is no longer generating a signal, but unsure what to get. There seem to be plenty available of these from...
  8. M

    Lets go into my induction stove

    You're right, that's my fault.
  9. M

    Lets go into my induction stove

    Off the top of my head i can think of only two reasons why that BJT would fail again so quickly... well aside from having two pins bridged ofc ;-). 1) Too much current is going through it cause it to melt internally. Measure amps from the mains with the right zone on and compare it to the left...
  10. M

    Lets go into my induction stove

    Loud bangs are not what we want :) Sound like a short in the circuit that is blowing up the BUTW92 as soon as it is switching power, are you sure the coil is ok? Didn't you also mention one of the relays was blown before? This all seems to indicate that the zone is drawing too much power.
  11. M

    Lets go into my induction stove

    Hey Did you replace that FET? Measurements depend on what type of FET's they are, i can't recall now. If you are getting a short from the base to any of the other pins that means the FET is shorted and needs to be replaced. Relays melting are an indication of too much current passing through...
  12. M

    Lets go into my induction stove

    You have to desolder the components under the sink to get it off. The short is probably in another component, but you'll have to take out components one by one until the short clears. The "open" readings might indicate a broken resistor somewhere. So desolder the FET's, take your readings...
  13. M

    Lets go into my induction stove

    I wouldn't worry about the microelectronics frying just yet, this could be a secondary issue. What i would focus on, is turning the cooker ON reliably. You say it does not turn on half the time, you need to figure out why. The main powerFET's will be large 3 pin devices (underneath the...
  14. M

    Lets go into my induction stove

    Induction cookers are weird that way. I could follow along with what you are doing using the PCB's i have here, however i simply do not have time right now, soon as that changes i'll do some readings of my own and let you know. I still have some induction PCB's to fix here so i'll let you know...
  15. M

    Whirlpool L1373 repair attempt

    Ok so i found out why i couldn't find anything wrong with the tacho sensor circuit, nor the TRIAC control circuit... Because there IS nothing wrong with it. So essentially after i replaced those relay switching transistors, the fix was complete as far as electronics are concerned. I guess i'll...
  16. M

    Lets go into my induction stove

    You should check the base current aswel, as that has a much lower tolerance.
  17. M

    Lets go into my induction stove

    I don't think you want the ones from my workshop, most have holes in them, and none of them actually work. I use them as donor boards. Sry :) Pandetection works through current sensing if i'm not mistaken, so if the zone is not drawing current, the pan detection will say there's no pot. Ofc, is...
  18. M

    Lets go into my induction stove

    Some fluctuation is normal, depending on the loads attached. If you want to explore this further, you could start by checking the capacitors on this board, specifically the low voltage ones to see if their capacitance and ESR is still in spec. You could also try hammering the 12v circuit a bit...
  19. M

    Lets go into my induction stove

    I would perform the following check to confirm the relays are ok: - while in circuit, turn on the board, if you hear the click, take a VDC reading across the coils of the relay, this should be very close to 24vdc, if not, then you have an issue in the LV circuit. - Take them out of circuit...
  20. M

    Lets go into my induction stove

    Remove them and do a simply continuity on the contact?
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