| Electronics > Repair |
| Fridge control board repair and capacitor identification help |
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| timeandfrequency:
hello nbd, If you want to replace T2 (common mode choke shown in figure 8 above), you do not need an exact replacement. The replacement part must have at least the same wire diameter and the same pin positionning. Other features are not that relevant in your case. Have a look at Mouser to see if you can find a suitable part : https://eu.mouser.com/c/passive-components/inductors-chokes-coils/common-mode-chokes-filters/?product=Common%20Mode%20Chokes&srsltid=AfmBOor0ae0RmMRbLr-eB70nsRdo1dWoUgXOAp9QPKDlw_US4aJ7RLL1 |
| nbd:
The details of their function is a little over my head. My main concern is I don't really comprehend the impact of inductance and impedance etc in the choke, and suitable components seem to widely vary in their values of these metrics. (I dont know the impact of putting in one that is far higher / lower than the preexisting one). that's why I guess I'm asking for anything, even with just knowing the application and voltage; if there is an expert that could say a relatively "safe" range I should be aiming for since I've seen that style ( same size, UU core, pin positioning etc) but in a variety of different wire thicknesses (wire gauge isn't listed on anything so it's hard to tell) but inductance values from 0.4mH up to like 30mH and impedance can vary even more extreme between products. I feel like just picking one at random would not be a great idea. |
| timeandfrequency:
Selecting the 'best' common mode choke and then confirming the choice made by validating its ability to successfully filter out most of the noise generated by the switcher goes far beyond what can be done in 99 % of all electronic labs (hobby or professionnal). These kind of measurements need to be perfomed in EMI labs where conducted interference level are carefully mesured, by skilled people using dedicated test equipement. This process is only required if you want to sell a new product. Don't worry about your fridge : replace the defective choke by using two straight wires, and this will be good enough for Australia (as Dave from the EEVblog often says). |
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