XPARTCO MCK69074904 Microwave Waveguide Cover / Insulator
- Sku:
- XPMCK69074904
- Vendor:
- XPARTCO
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XPARTCO MCK69074904 Microwave Waveguide Cover / Insulator
XPARTCO MCK69074904 Microwave Waveguide Cover / Insulator
The XPARTCO MCK69074904 is an aftermarket replacement waveguide cover, also known as an insulator cover or mica plate, for LG microwaves and select Bosch models. This cover protects the opening where microwave energy enters the cooking cavity from the magnetron. By covering that opening, it ensures microwaves are distributed evenly throughout the cavity while also preventing food particles, grease, and moisture from reaching and damaging the internal waveguide components.
Made of mica, a material that's essentially invisible to microwave energy, this cover measures approximately 4.88" x 4.94" (126mm x 124mm including tabs) and includes a locking button/pin tab for secure mounting. Over time, splattering food and moisture exposure can cause the mica to degrade, warp, or become contaminated, and old, damp, or contaminated mica can react to microwave energy by arcing. If this cover becomes damaged, you'll typically notice sparks or arcing inside the microwave during use, along with possible uneven heating as microwave distribution is no longer properly controlled. It directly replaces MCK69074904, MCK69074902, 4957254, AP6888006, EAP12725272, ALG55468, PD00056750, PS12725272.
Quick Answer
The XPARTCO MCK69074904 Microwave Waveguide Cover / Insulator fixes LG (and select Bosch) microwaves showing sparks or arcing inside the cavity during use, or heating unevenly. Mica plate, approx. 4.88" x 4.94", locking button/pin tab. Replaces MCK69074904, MCK69074902, 4957254, AP6888006, EAP12725272, ALG55468, PD00056750, PS12725272. Accessing this cover means opening the microwave's outer cabinet, which also exposes the high-voltage capacitor — treat that area with the same caution as any internal microwave repair.
Common Problems This Part Fixes
- Sparks or arcing visible inside the microwave cavity during use
- Uneven heating as microwave energy distribution is disrupted
- Visibly damaged, warped, or contaminated mica cover
- Burning smell during operation caused by arcing at the waveguide opening
- Food particles or moisture damage near the magnetron opening
Cross Reference Information
Part numbers can change over a product's lifecycle as manufacturers update designs or release new appliance models. For your convenience, we've included any known superseded, alternate, or cross-reference part numbers that match this item.
Replaces Part Numbers
This microwave waveguide cover directly replaces the following OEM and cross-reference part numbers:
MCK69074904, MCK69074902, 4957254, AP6888006, EAP12725272, ALG55468, PD00056750, PS12725272.
If your part number is not listed above, contact our support team before ordering and we will verify compatibility.
Compatibility
This waveguide cover is compatible with select LG microwaves, including model numbers such as LMC0975AST, LMC0975ASZ, LMC0975SB, LMC0975ST, LMC1275SB, LMC1375SB, LMC1375SW, LMC1575BD, LMC1575SB, LMC1575ST, LMC1575SW, MH1536GIR, MH1596CIR, MS0936GIS, MS1536GIR, MS1596CIR, and MSWN1590L. It has also been used as a compatible replacement on select Bosch microwave models built on related platforms.
Note: Always verify your full model number before ordering, since LG uses several different waveguide cover sizes and mounting styles across its microwave lineup. Contact our support team with your model number if you're unsure.
Key Features
- Aftermarket replacement waveguide cover — protects the magnetron opening and ensures even microwave distribution
- Resolves "sparking or arcing inside the cavity" and "uneven heating" symptoms caused by a damaged cover
- Mica construction — resistant to high temperature and corrosion, essentially invisible to microwave energy
- Approximately 4.88" x 4.94" (126mm x 124mm including tabs)
- Locking button/pin tab for secure mounting
- Direct drop-in replacement matching the original mounting and dimensions
- Replaces MCK69074904, MCK69074902, 4957254, AP6888006, EAP12725272, ALG55468, PD00056750, PS12725272
- Compatible with LG and select Bosch microwaves
- Aftermarket replacement built to OEM-equivalent quality standards
- Simple 15 to 30 minute repair
Product Specifications
| Part Number | XPMCK69074904 |
| OEM Part Number | MCK69074904 |
| Part Type | Microwave Waveguide Cover / Insulator (Mica Plate) |
| Condition | Aftermarket Replacement |
| Material | Mica |
| Dimensions | Approx. 4.88" x 4.94" (126mm x 124mm incl. tabs) |
| Mounting | Locking button/pin tab |
| Function | Protects the waveguide opening and ensures even microwave distribution |
| Repair Difficulty | Easy — 15 to 30 minutes |
| Quantity | 1 waveguide cover |
| Compatible Brands | LG, select Bosch |
Installation Notes
Frequently Asked Questions
I see sparks inside my microwave. Is this the part I need?
Yes, this is the classic and most direct symptom of a damaged waveguide cover. Old, damp, warped, or food-contaminated mica can react to microwave energy by arcing at the point where it's damaged. Replacing the cover typically resolves this sparking immediately.
Is it safe to keep using my microwave if I notice sparking?
No, it's best to stop using the microwave once you notice sparking or arcing and replace the cover as soon as possible. Continued arcing can cause more serious damage to the magnetron and other internal components, turning a simple, inexpensive repair into a much costlier one.
What is mica, and why is it used for this part?
Mica is a naturally heat-resistant, corrosion-resistant material that is essentially invisible to microwave energy, meaning it doesn't interfere with or absorb the microwaves passing through it. This makes it ideal for a cover positioned directly in the path of the microwave energy entering the cavity, since it protects the opening without disrupting how the microwave actually cooks food.
Is this an OEM or aftermarket part?
This is an aftermarket replacement part built to OEM-equivalent quality standards. It is not a genuine LG OEM part, but is manufactured to match the mica composition, dimensions, and mounting configuration of the original MCK69074904 waveguide cover used in compatible LG and Bosch microwaves.
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A U.S.-based appliance parts retailer specializing in genuine OEM and high-quality replacement parts. We stock components for all major appliance brands and offer fast shipping from our U.S. warehouse. Our team is available to help verify compatibility before you purchase.
Model Compatibility
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⚠️ This is a partial compatibility list. Always verify your appliance model number before ordering. Contact our support team if you’re unsure.