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MW8490W (XAA) Samsung Microwave - Overview

Sections of the MW8490W

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Micro Door Switch – Part Number: 3405-001034
Micro Door Switch
★★★★★
★★★★★
(12)
PartSelect #: PS4131192
Manufacturer #: 3405-001034
This door switch, also known as a safety switch, is a genuine OEM replacement part for microwaves. It is a safety mechanism that sends signals to the microwaves control system, telling it when the doo...
$32.63
  On Order
High-Voltage Diode – Part Number: DE91-70063D
High-Voltage Diode
★★★★★
★★★★★
(4)
PartSelect #: PS4235633
Manufacturer #: DE91-70063D
This high-voltage diode is designed for use within various makes and models of microwaves and is a genuine OEM part that converts alternating current (AC) into direct current (DC). If you notice your ...
$33.69
  On Order
Button Spring – Part Number: DE61-70076A
Button Spring
PartSelect #: PS4227643
Manufacturer #: DE61-70076A
$27.36
  In Stock
Order now and your part arrives by Apr 20
Thermostat – Part Number: DE47-20030A
Thermostat
PartSelect #: PS4226425
Manufacturer #: DE47-20030A
$23.60
  Special Order
Incandescent Lamp – Part Number: 4713-001102
Incandescent Lamp
★★★★★
★★★★★
(2)
PartSelect #: PS4132144
Manufacturer #: 4713-001102
$32.63
  In Stock
Order now and your part arrives by Apr 20
Door Lever – Part Number: DE66-90013A
Door Lever
PartSelect #: PS4231371
Manufacturer #: DE66-90013A
$30.53
  In Stock
Order now and your part arrives by Apr 20
Microswitch – Part Number: 3405-001032
Microswitch
PartSelect #: PS4131190
Manufacturer #: 3405-001032
$36.85
  In Stock
Order now and your part arrives by Apr 20
Glass Turntable Tray – Part Number: DE74-20019A
Glass Turntable Tray
PartSelect #: PS4234965
Manufacturer #: DE74-20019A
$139.80
  In Stock
Order now and your part arrives by Apr 20
Magnetron Cover – Part Number: DE71-60449A
Magnetron Cover
PartSelect #: PS4234194
Manufacturer #: DE71-60449A
$30.53
  Special Order
Thermostat Assembly – Part Number: DE47-20008A
Thermostat Assembly
PartSelect #: PS4226405
Manufacturer #: DE47-20008A
$38.96
  In Stock
Order now and your part arrives by Apr 20
Low Voltage Transformer – Part Number: DE26-20144A
Low Voltage Transformer
PartSelect #: PS4223771
Manufacturer #: DE26-20144A
$85.95
  Special Order
FOOT;-,PP(A353),MW5630T, – Part Number: DE61-40017A
FOOT;-,PP(A353),MW5630T,
PartSelect #: PS4227340
Manufacturer #: DE61-40017A
$6.40
  Special Order

Questions And Answers for MW8490W

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Common Symptoms of the MW8490W

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No heat
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Doesn’t shut off
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Won’t turn on
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Keep searches simple. Use keywords, e.g. "leaking", "pump", "broken" or "fit".
Buzzing noise, no heating of food
Removed control panel, discharged HV capacitor. Removed old diode, tested to confirm failure. Replaced part. Other than the removal of the panel swapping the part was almost as easy as replacing a light bulb.
Parts Used:
High-Voltage Diode
  • Ted from Hudson, NH
  • Difficulty Level:
    Easy
  • Total Repair Time:
    30 - 60 mins
  • Tools:
    Pliers, Screw drivers
22 of 32 people found this instruction helpful.
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Microwave stopped working - would not heat up
I removed the outer cover and exposed the inner workings. I watched a video on partselect.com to show how to remove and replace the Diode. I followed the instructions and it was very easy to replace.

Unfortunately, the diode was only part of the issue. I ended up replacing the High Voltage capacitor and Magnetron also. Those were a little more complicated but still easy to do.

Now the Microwave works just like new! Cost me less than $100 for all parts.
Parts Used:
High-Voltage Diode
  • louis from PARRISH, FL
  • Difficulty Level:
    Easy
  • Total Repair Time:
    1- 2 hours
  • Tools:
    Pliers, Screw drivers
11 of 19 people found this instruction helpful.
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Appears to work, but food not heated
The high voltage tired was shorted. I replaced it with a new one, but that did not solve the problem.

You can test the high voltage tired with a voltmeter and a 9 V battery. Search Search for it on YouTube.

You can also test the high voltage capacitor, the high-voltage transformer, and the magnetron with a multi meter. Search for the procedures on YouTube.

I tested all these high-voltage components with a low-voltage multi meter, and they all checked out OK (after replacing the diode). However the microwave still did not heat food.

When working on a microwave it is important to unplug it and also discharge the high voltage capacitor. The capacitor has a 10 megaohm resister to automatically discharge itself, but it may have failed – – so discharge it manually.

In the end I ordered a new microwave.
Parts Used:
High-Voltage Diode
  • Joel from CAMBRIDGE, MA
  • Difficulty Level:
    Difficult
  • Total Repair Time:
    1- 2 hours
20 of 47 people found this instruction helpful.
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