Models > MW8490W

MW8490W (XAA) Samsung Microwave - Overview

Sections of the MW8490W

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Micro Door Switch – Part Number: 3405-001034
Micro Door Switch
★★★★★
★★★★★
(10)
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...
$37.05
  In Stock
Order within the next 11 hrs and your part ships today!
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 ...
$29.79
  In Stock
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SPRING-BUTTON;-,HSWR,PI0 – Part Number: DE61-70076A
SPRING-BUTTON;-,HSWR,PI0
PartSelect #: PS4227643
Manufacturer #: DE61-70076A
$14.58
  In Stock
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Thermostat – Part Number: DE47-20030A
Thermostat
PartSelect #: PS4226425
Manufacturer #: DE47-20030A
$27.00
  In Stock
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Incandescent Lamp – Part Number: 4713-001102
Incandescent Lamp
★★★★★
★★★★★
(1)
PartSelect #: PS4132144
Manufacturer #: 4713-001102
$38.16
  In Stock
Order within the next 11 hrs and your part ships today!
Door Lever – Part Number: DE66-90013A
Door Lever
PartSelect #: PS4231371
Manufacturer #: DE66-90013A
$36.97
  In Stock
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SWITCH-MICRO;125/250VAC, – Part Number: 3405-001032
SWITCH-MICRO;125/250VAC,
PartSelect #: PS4131190
Manufacturer #: 3405-001032
$26.60
  In Stock
Order within the next 11 hrs and your part ships today!
Glass Turntable Tray – Part Number: DE74-20019A
Glass Turntable Tray
PartSelect #: PS4234965
Manufacturer #: DE74-20019A
$129.11
  In Stock
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Magnetron Cover – Part Number: DE71-60449A
Magnetron Cover
PartSelect #: PS4234194
Manufacturer #: DE71-60449A
$37.68
  Special Order
Thermostat Assembly – Part Number: DE47-20008A
Thermostat Assembly
PartSelect #: PS4226405
Manufacturer #: DE47-20008A
$32.18
  In Stock
Order within the next 11 hrs and your part ships today!
Low-Voltage Transformer – Part Number: DE26-20144A
Low-Voltage Transformer
PartSelect #: PS4223771
Manufacturer #: DE26-20144A
$93.21
  In Stock
Order within the next 11 hrs and your part ships today!
FOOT;-,PP(A353),MW5630T, – Part Number: DE61-40017A
FOOT;-,PP(A353),MW5630T,
PartSelect #: PS4227340
Manufacturer #: DE61-40017A
$4.18
  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
9 of 15 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
12 of 25 people found this instruction helpful.
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The microwave would not turn on or would run with the door open
Other tools that are usefull long needle nose pliers, long thin blade screw driver and small magnetic flashlight. Place the microwave on a work bench and remove the case it cover 3 sides. Place the microwave on a chair so it can stand with the controls up. You are replacing the lower door microswitch. The switch is located behind the control panel in the lower part of the area. The switch is several inches inside this area and your hands will not fit. Take care when moving wires and a couple of sensors. Use the thin blade screwdriver to release a tab holding the switch in place. Do not break this tab. Take the needle nose pliers and remove the switch. Put the wires on the new switch, open the door a short distance so a door lever moves enough to put the microswitch back into the bracket.
Parts Used:
Micro Door Switch
  • Raymond from TROY, OH
  • Difficulty Level:
    Easy
  • Total Repair Time:
    1- 2 hours
  • Tools:
    Screw drivers
5 of 10 people found this instruction helpful.
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