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Interesting induction cooker fault.

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LAN_403

Conundrum

Sat Apr 09 2011, 07:30PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

Hi all.

I finally got around to dismantling the half-dead induction cooker.

One side worked for about a minute under minimal load before something went wrong, the other was 100% dead.

Upon examining the PCBs it appears that there are two 82K 0.5W resistors that generate the startup voltage to energise the input relay and run the 5V regulators for the touch sensor boards.

Metering these revealed that in both cases one of the two resistors was open circuit, and the other was out of spec yet there was no sign of overheating.
Even more strange, the resistor which was O/C was in a different location on the two boards.

Can anyone provide a theory as to why these broke?
Obviously the next step is to replace all four of them with new ones and retest.

-A

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