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HELP: Induction hob power supply fault (incorrect voltage to rectifier)

DanManTezz

May 4, 2023
2
Joined
May 4, 2023
Messages
2
Hi everyone,
I have a CDA HVN91FR induction hob that partly works.
2 hobs (connected to one PCB board) are not working. The other 3 are.
Can't see any visual damage/problems.
Upon closer inspection, the power supplied to the rectifier in the 'dead' PCB seems too high.
In the working PCB board (for 2 other working hobs), the power supplied to the rectifier is 100V AC.
In the 'dead' one it's showing 230V AC.
It must be a simple voltage divider somewhere in the circuit but I can't figure it out!
HELP!
(Images attached of front and back of board; in same orientation)
Power supply on the right, rectifier on left
What is the yellow part?
 

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Delta Prime

Jul 29, 2020
2,214
Joined
Jul 29, 2020
Messages
2,214
I believe this transformer needs closer inspection looks like a rupture confirm
photo_1683201251903.png
 

Bluejets

Oct 5, 2014
7,095
Joined
Oct 5, 2014
Messages
7,095
Transformer won't output higher than design unless input is higher than design.
I'd suggest you have a repair induced error ( wrong measuring )
 
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