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Recent content by Rui Almeida

  1. R

    Lets go into my induction stove

    Thank you Maxwell. Here are the latest news on the RIGHT zone: I again checked the current across one of the R11 or R12 and it was still like what I got on the 3rd of november last year when I wrote: "RIGHT-side: Update on having put the new Q3,Q4,D34 and D39 components. In measuring the current...
  2. R

    Lets go into my induction stove

    RIGHT Zone: Substituted Q3 and Q4, and since D34 and D39 gave strange readings, I substituted them too. Also substituted practically all capacitors(C10,C11,C19,C20,C33,C34,C36,C37). With out-of-board readings, only one of them seemed to be faulty. Substituted also resistor R32 which instead of...
  3. R

    Lets go into my induction stove

    Hi Maxwell! Here are the updates on the RIGHT Zone, the left zone seems to still be working after I substituted that melted relay. RIGHT Zone: I took out for the x-th time both pcbs out. I checked the "high current NPN transistor" that I substituted under the heatsink and it checked out fine...
  4. R

    Lets go into my induction stove

    Wow that is great Maxwell, that you have drawn it out for me! I will do the procedures you suggest in the coming days and will get back.
  5. R

    Lets go into my induction stove

    Hi Maxwell, thank you for your quick reply to my last post which I did delete, just not quick enough... I got to see why there was a loud bang... some (unseen) solder joined two legs of the FET and on the filter board the security strip just melted when I turned that zone on. I soldered the...
  6. R

    Lets go into my induction stove

    Ok, thanks. I ordered FETs (BUTW92) (four of them just in case). Because of your comment I will check the FETs on the LEFT board also. When I have the new FET intalled on the RIGHT board I will let you know.
  7. R

    Lets go into my induction stove

    RIGHT BOARD: I include a photo of the things under the heatsink. So out of circuit the measurements in diode reading mode are as below COMPONENT :: connection :: RIGHT BOARD Q1 :: C-E+ :: 515 Q1 :: C+E- :: open Q1 :: C-B+ :: open Q1 :: C+B- :: open Q2 :: C-E+ :: 258 Q2 :: C+E- :: 783 Q2 :: C-B+...
  8. R

    Lets go into my induction stove

    I thought I just right now check Q1 and Q2, and there definitely seems to be comething wrong, here are the readings: With the MM in the diode measuring mode: COMPONENT :: connection :: LEFT BOARD :: RIGHT BOARD Q1 :: C-E+ :: 403 :: 411...
  9. R

    Lets go into my induction stove

    Thank you! I will do what you suggest, and will start by checking the specific components you mention and then the other big ones on the top of the PCB. The FETs you mentioned, I suppose these are the Q1 and Q2 underneath the heatsink, I will first try to detect some significant difference...
  10. R

    Lets go into my induction stove

    Ok Maxwell, any help from you is much appreciated. I think you have to be patient with me, because I don't have an electronics course. The FET you are talking about, is it the power switching diode D34(D39), or is it something else? I have doubts on how I should measure the base to collector...
  11. R

    Lets go into my induction stove

    RIGHT-side: Update on having put the new Q3,Q4,D34 and D39 components. In measuring the current across them. Well there is certainly a problem because, even with the right zones off, there is a current across these components, the measured voltage drop across the R11 resistor was 11.7V, so that...
  12. R

    Lets go into my induction stove

    Hi Maxwell, you know I'm not that knowledgable, when you say "base current" do you mean on the transistors Q3 and Q4 the current between the collector and the base? I'm still waiting for the components to be delivered...
  13. R

    Lets go into my induction stove

    RIGHT zones: ok I will proceed to change (again) the Q3, Q4 transistors but now also the D39 and D34 power switching diodes to see how that works. I will operate it and monitor the voltage across the R11 and R12 resistances to see if the current across these components is within 500mA. I will...
  14. R

    Lets go into my induction stove

    Update: having done nothing, the left zones now exhibit the following behaviour: Left-UP: doesn't detect any pan, doesn't warm up, display keeps blinking until timeout shuts it off. left-DOWN: works normally, though there is a strange behaviour; when I put the timer and it comes to zero and...
  15. R

    Lets go into my induction stove

    Ok thanks Maxwell. About these low(12V) voltage capacitors, there are a few I think, I suppose I have to take them out of circuit one by one to check them, right? though none of them seem bulged ... also I suppose I will need to buy an ESR meter, perhaps it's cheaper to just substitute them...
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