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-   -   cook top lights on whirlpool micro hood (http://forum.appliancepartspros.com/microwave-repair/397354-cook-top-lights-whirlpool-micro-hood.html)

gudlife 01-03-2012 06:51 PM

cook top lights on whirlpool micro hood
 
A bit of googling indicates that the lights on these units tend to be a common problem. Mine were fine until the other day when we had a power outage. I'm guessing the inrush surge popped the board. Everything else on the unit works fine.

The simple answer is to replace the board...at roughly the cost of a new unit. Kind of steep just to fix my wife's favorite night light.

I was thinking of breaking out the soldering iron and replacing what I figured would be a faulty relay. Now I am looking at the wiring diagram and I see some notation that is new to me.

Anybody done a board level repair on one of these?

The mico controller side of the circuit seems to function fine. The turntable and fan controls function and the unit beeps when I hit the lights button. The wiring diagram shows standard relays for the turntable and the vent, but the lights show up as attached to PH1 and VR2. I can't find any notation on what PH stands for anywhere? The resistor I'm guessing has something to do with the dual brightness modes. Any thoughts?

ApplianceJunk 01-04-2012 07:13 AM

Quote:

Now I am looking at the wiring diagram and I see some notation that is new to me.
What notation?

gudlife 01-04-2012 09:42 AM

All of the other components with relays were indicated as R and the lighting circuit had what looked like a relay marked as PH.

I pulled the board and PH apparently equals SSR solid state relay. Specifically a samsung S201DH2. The relay coupled with a Samwha svc 271-14 varistor is apparently what controls the current output to the lighting circuit for the 2 brightness settings.

I couldn't get any continuity through the varistor so I figured it might be dead. When I jumper around it my lights come on bright. Still no on/off function and no dim/bright (which I figured the varistor would be used for anyway).

Still not sure if I have a bad varistor, SSR or bad control input to the SSR. I found a pretty close varistor for around $2 from mouser and ******** has the SSRs for around $4. Guess I'll have to play with it some more-


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