Hey all:

We have a Whirlpool under counter, over stove microwave (vented 
outside).  I replaced the underneath light bulb about a month back and 
it quit again today.  My wife was replacing it and it popped, blew the 
glass bulb out of the metal socket/base, and won't work anymore.  I 
think that when she moved the bulb it shorted out inside the bulb 
assembly and destroyed some circuitry inside the microwave.  I tested 
the leads to the bulb socket and there is no power there.  The light 
switch (soft touch button) still beeps like it's doing something when 
you push it (it has three settings, off, bright, dim (night light)). 
Anyone have any ideas?  Please and thanks, HDK

On May 6, 10:38=A0pm, HanKdKranK  wrote:
> Hey all:
>
> We have a Whirlpool under counter, over stove microwave (vented
> outside). =A0I replaced the underneath light bulb about a month back and
> it quit again today. =A0My wife was replacing it and it popped, blew the
> glass bulb out of the metal socket/base, and won't work anymore. =A0I
> think that when she moved the bulb it shorted out inside the bulb
> assembly and destroyed some circuitry inside the microwave. =A0I tested
> the leads to the bulb socket and there is no power there. =A0The light
> switch (soft touch button) still beeps like it's doing something when
> you push it (it has three settings, off, bright, dim (night light)).
> Anyone have any ideas? =A0Please and thanks, HDK

2 possibilities: Did you put in the right voltage bulb, ie put in a
12V bulb when its suppose to be 120V?
 or possible it uses halogen bulbs and touching it with your fingers
left oil on the bulb resulting it in popping.
In any event if you have no voltage at the socket, something blew
inside.

On May 6, 7:38=A0pm, HanKdKranK  wrote:
> Hey all:
>
> We have a Whirlpool under counter, over stove microwave (vented
> outside). =A0I replaced the underneath light bulb about a month back and
> it quit again today. =A0My wife was replacing it and it popped, blew the
> glass bulb out of the metal socket/base, and won't work anymore. =A0I
> think that when she moved the bulb it shorted out inside the bulb
> assembly and destroyed some circuitry inside the microwave. =A0I tested
> the leads to the bulb socket and there is no power there. =A0The light
> switch (soft touch button) still beeps like it's doing something when
> you push it (it has three settings, off, bright, dim (night light)).
> Anyone have any ideas? =A0Please and thanks, HDK

If it's anything like my Sharp OTR microwave, pretty much all the
circuitry except the high power stuff is on a single circuit board. If
something is bad on there, you either have to isolate to the defective
part, or replace the board. If that's beyond your skill set, an
appliance repair tech will probably want to replace the board. At that
point, you might be talking about the tradeoff between the repair
costs or buying a new microwave.

My Sharp has 2 bulbs, AC power is switched to them by relays
controlled by the microprocessor on the board. If your setup is
similar, and the power was shorted when replacing the bulb, it's
possible that either the relay contacts are bad, or circuit board
traces leading to or from the relay(s) could have opened up.

Jerry

In article <4a024992$0$23746$b...@news.suddenlink.net>,
 HanKdKranK <H...@Yahoo.com> wrote:

> Hey all:
> 
> We have a Whirlpool under counter, over stove microwave (vented 
> outside).  I replaced the underneath light bulb about a month back and 
> it quit again today.  My wife was replacing it and it popped, blew the 
> glass bulb out of the metal socket/base, and won't work anymore.  I 
> think that when she moved the bulb it shorted out inside the bulb 
> assembly and destroyed some circuitry inside the microwave.  I tested 
> the leads to the bulb socket and there is no power there.  The light 
> switch (soft touch button) still beeps like it's doing something when 
> you push it (it has three settings, off, bright, dim (night light)). 
> Anyone have any ideas?  Please and thanks, HDK

This isn't a recipe-type fix. Remove the microwave from its mounting 
brackets, take it apart, and see what's going on. If the trouble isn't 
obvious from a visual inspection, then hopefully you'll find a schematic 
tucked inside the machine and you'll be able to troubleshoot it.

Thanks all for the advice.  It's kinda what I thought, take it apart and 
see what's up.  Maybe I'll get lucky and find a bad relay.  Happy 
Mothers' Day to all.   HDK

Smitty Two wrote:
> In article <4a024992$0$23746$b...@news.suddenlink.net>,
>  HanKdKranK <H...@Yahoo.com> wrote:
> 
>> Hey all:
>>
>> We have a Whirlpool under counter, over stove microwave (vented 
>> outside).  I replaced the underneath light bulb about a month back and 
>> it quit again today.  My wife was replacing it and it popped, blew the 
>> glass bulb out of the metal socket/base, and won't work anymore.  I 
>> think that when she moved the bulb it shorted out inside the bulb 
>> assembly and destroyed some circuitry inside the microwave.  I tested 
>> the leads to the bulb socket and there is no power there.  The light 
>> switch (soft touch button) still beeps like it's doing something when 
>> you push it (it has three settings, off, bright, dim (night light)). 
>> Anyone have any ideas?  Please and thanks, HDK
> 
> This isn't a recipe-type fix. Remove the microwave from its mounting 
> brackets, take it apart, and see what's going on. If the trouble isn't 
> obvious from a visual inspection, then hopefully you'll find a schematic 
> tucked inside the machine and you'll be able to troubleshoot it.

On May 10, 12:18=A0pm, HanKdKranK  wrote:
> Thanks all for the advice. =A0It's kinda what I thought, take it apart an=
d
> see what's up. =A0Maybe I'll get lucky and find a bad relay. =A0Happy
> Mothers' Day to all. =A0 HDK
>
>
>
> Smitty Two wrote:
> > In article <4a024992$0$23746$b...@news.suddenlink.net>,
> > =A0HanKdKranK  wrote:
>
> >> Hey all:
>
> >> We have a Whirlpool under counter, over stove microwave (vented
> >> outside). =A0I replaced the underneath light bulb about a month back a=
nd
> >> it quit again today. =A0My wife was replacing it and it popped, blew t=
he
> >> glass bulb out of the metal socket/base, and won't work anymore. =A0I
> >> think that when she moved the bulb it shorted out inside the bulb
> >> assembly and destroyed some circuitry inside the microwave. =A0I teste=
d
> >> the leads to the bulb socket and there is no power there. =A0The light
> >> switch (soft touch button) still beeps like it's doing something when
> >> you push it (it has three settings, off, bright, dim (night light)).
> >> Anyone have any ideas? =A0Please and thanks, HDK
>
> > This isn't a recipe-type fix. Remove the microwave from its mounting
> > brackets, take it apart, and see what's going on. If the trouble isn't
> > obvious from a visual inspection, then hopefully you'll find a schemati=
c
> > tucked inside the machine and you'll be able to troubleshoot it.- Hide =
quoted text -
>
> - Show quoted text -
If the bulb socket tends to be exposed to heat or fumes it may have
corroded and/or the internal threaded socket have twisted or shifted.
Realizing the the light bulb is probably just a switched 115 volt lamp
circuit; but be very careful if the rest of the microwave works while
you have any covers off.
There's 5000 volts DC on the magnetron inside and the possibility of
RF (microwave) leakage. So stand well back from any exposed 'works'.
If you are not an experienced microwave or radio transmitter
technician do not work on the microwave portion itself.
This is not to be negative; just careful!
Good luck with the repair.