• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

    Jake

FIXED SMH8165W/XAC Samsung OTR Microwave has lost power

kmivens

Premium Member
Joined
Jul 1, 2010
Messages
43
Location
Ontario, Canada
Model Number
SMH8165W/XAC
Brand
Samsung
Age
1-5 years
My Samsung SMH8165W/XAC microwave has no power at all. However, there is power to the outlet. I think that it is a thermal problem because my wife and myself were doing some canning yesterday and had alot of pots boiling. The exhaust fan started up automatically as is the norm for this unit when high temperatures are noted. All of a sudden everything shut down. We had a similar thing happen a couple of years ago and it was repaired under warranty. However, since it is no longer under warranty, I figured that I would try and trouble shoot it myself. Is there a thermal fuse or sensor that needs to be replaced? Any help in trouble shooting would be appreciated.

Thanks

Kirk
 

jeff1

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kmivens

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Jeff, Thanks for your reply. I will check out those components tonight. I would think that I would need to discharge the high voltage capacitor before working on this. Are there any guidelines for doing this? Would I just short the terminals of the capacitor together?
 

jeff1

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nuker101.JPG

Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it. With the microwave unplugged.

jeff.
 

kmivens

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Messages
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Location
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Thanks again Jeff. I pulled the microwave apart last night and found that 3 of the 4 t-stats had no continuity across them. However, I am wondering if all of these parts should test normally closed. I would assume that at least one of these should test normally open and close at high temperatures to activate the exhaust fan. Looking at the system, I would think that the item listed below should actually test normally open and the others normally closed. Is this something that you would be able to confirm?


Thermostat Manufacturer Number DE47-20020A
 

jeff1

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Wire diagram is not online, post a copy and we can trace what ones are what.

jeff.
 

jeff1

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It looks to me like the TC that operates the range hood fan is normally open and the others are normally closed. Does this seem right to you?
Yes it does.

jeff.
 

kmivens

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Hi Jeff, I just wanted to let you know that I installed the thermostats this evening and everything is working fine now. Thanks alot for your help. I really appreciated it.
 

jeff1

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Thankx for the update :)

jeff.
 

rakesh.kmr

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Joined
Oct 4, 2018
Messages
2
Location
Richmond VA
ME18H704SFS . - NO Power

Thankx for the update :)

jeff.
Hi Jeff / All,

I have Samsung ME18H704SFS microwave about 2 year old and I have tested it for continuity for:

2 fuses - Looks good
There are 4 thermostat and 1 shows open and 3 closed.
1 - Thermostat (behind control panel there are two) on right shows Closed
1 - Thermostat (behind control panel there are two) on Left shows OPEN
1 Thermostat on top of oven shows Closed
1 Thermostat behind transformer shows closed

The one which is showing open looks like for the fan and that is how it should be (based on pervious comments from some forum).

I am wondering what should be my next step for investigation??? Outlet have the power and I tested power inside microwave is also going but the penal have no lights.. seems DEAD.
 

jeff1

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Hi,

2 fuses - Looks good
?Looks? good? Have these been ohm tested?

me18h704sfs
I found:

ME18H704SFS/AA-0000 ME18H704SFS/AA-0001

Has the cavity thermostat been checked? ( one on top )
Also maybe power to the smart board should be checked, if the board is bad the whole unit would not work.

LINK> Thermostat

jeff.
 

rakesh.kmr

Premium Member
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Oct 4, 2018
Messages
2
Location
Richmond VA
I hav checked the fuses for continuity - what value for OHM they should show?

Thermostat on top is also showing good for continuity..
 
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