{"product_id":"xpartco-mck69074904-microwave-waveguide-cover-insulator","title":"XPARTCO MCK69074904 Microwave Waveguide Cover \/ Insulator","description":"\u003cstyle\u003e.pom { font-family: 'Inter', sans-serif; color: #1e293b; line-height: 1.75; }\n  .pom *, .pom *::before, .pom *::after { box-sizing: border-box; }\n  .pom h2 { font-size: 21px; font-weight: 900; color: #0f172a; margin: 0 0 12px; letter-spacing: -0.01em; }\n  .pom h3 { font-size: 17px; font-weight: 900; color: #0f172a; margin: 0 0 12px; letter-spacing: -0.01em; }\n  .pom-card { background: #fff; border: 1px solid #e2e8f0; border-radius: 12px; padding: 20px 22px; margin-bottom: 16px; }\n  .pom-card-blue { background: #eff6ff; border-color: #bfdbfe; }\n  .pom-card-green { background: #f0fdf4; border-color: #bbf7d0; }\n  .pom-qa { background: #eff6ff; border-left: 4px solid #1e40af; border-radius: 0 8px 8px 0; padding: 16px 20px; margin-bottom: 16px; }\n  .pom-qa-label { font-size: 10px; font-weight: 900; letter-spacing: 0.1em; text-transform: uppercase; color: #1e40af; margin: 0 0 6px; }\n  .pom ul { margin: 0; padding: 0; list-style: none; }\n  .pom ul li { position: relative; padding-left: 20px; margin-bottom: 8px; font-size: 16px; }\n  .pom ul li::before { content: \"\"; position: absolute; left: 0; top: 9px; width: 7px; height: 7px; border-radius: 50%; background: #1e40af; }\n  .pom-list-green li::before { background: #15803d; }\n  .pom-specs-table { width: 100%; border-collapse: collapse; font-size: 15px; }\n  .pom-specs-table tr { border-bottom: 1px solid #f1f5f9; }\n  .pom-specs-table tr:last-child { border-bottom: none; }\n  .pom-specs-table td { padding: 9px 4px; }\n  .pom-specs-table td:first-child { color: #1e293b; width: 45%; font-style: italic; }\n  .pom-specs-table td:last-child { font-weight: 700; color: #0f172a; }\n  .pom-warning { background: #fffbeb; border-left: 4px solid #f59e0b; border-radius: 0 8px 8px 0; padding: 14px 18px; font-size: 15px; color: #92400e; line-height: 1.65; }\n  .pom-warning strong { display: block; margin-bottom: 5px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; }\n  .pom-faq-item { margin-bottom: 16px; padding-bottom: 16px; border-bottom: 1px solid #f1f5f9; }\n  .pom-faq-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }\n  .pom-faq-q { font-weight: 700; color: #0f172a; margin-bottom: 5px; font-size: 16px; }\n  .pom-faq-a { font-size: 15px; color: #334155; margin: 0; line-height: 1.65; }\n  .pom-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }\n  .pom-badge { background: #f0fdf4; border: 1px solid #bbf7d0; color: #15803d; font-size: 14px; font-weight: 700; padding: 6px 14px; border-radius: 999px; }\n  .pom p { margin: 0 0 12px; font-size: 16px; }\n  .pom p:last-child { margin-bottom: 0; } \u003c\/style\u003e\n\u003cdiv class=\"pom\"\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch2\u003eXPARTCO MCK69074904 Microwave Waveguide Cover \/ Insulator\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eMade 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-qa\"\u003e\n\u003cp class=\"pom-qa-label\"\u003eQuick Answer\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eXPARTCO MCK69074904 Microwave Waveguide Cover \/ Insulator\u003c\/strong\u003e 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. \u003cem\u003eAccessing 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.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch3\u003eCommon Problems This Part Fixes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSparks or arcing visible inside the microwave cavity during use\u003c\/li\u003e\n\u003cli\u003eUneven heating as microwave energy distribution is disrupted\u003c\/li\u003e\n\u003cli\u003eVisibly damaged, warped, or contaminated mica cover\u003c\/li\u003e\n\u003cli\u003eBurning smell during operation caused by arcing at the waveguide opening\u003c\/li\u003e\n\u003cli\u003eFood particles or moisture damage near the magnetron opening\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"font-size: 17px; font-weight: 900; color: #0f172a; margin: 0 0 8px; letter-spacing: -0.01em;\"\u003eCross Reference Information\u003c\/h3\u003e\n\u003cp style=\"font-size: 15px; color: #475569; margin-bottom: 12px;\"\u003ePart 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.\u003c\/p\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch3\u003eReplaces Part Numbers\u003c\/h3\u003e\n\u003cp\u003eThis microwave waveguide cover directly replaces the following OEM and cross-reference part numbers:\u003c\/p\u003e\n\u003cp style=\"font-family: monospace; font-size: 15px; color: #0f172a; font-weight: bold; line-height: 2.2;\"\u003eMCK69074904, MCK69074902, 4957254, AP6888006, EAP12725272, ALG55468, PD00056750, PS12725272.\u003c\/p\u003e\n\u003cp style=\"margin-top: 4px; font-size: 15px; color: #475569;\"\u003eIf your part number is not listed above, contact our support team before ordering and we will verify compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card pom-card-blue\"\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis waveguide cover is compatible with select \u003cstrong\u003eLG microwaves\u003c\/strong\u003e, 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.\u003c\/p\u003e\n\u003cp style=\"margin-top: 12px; font-size: 15px; color: #92400e; background: #fffbeb; border-left: 4px solid #f59e0b; padding: 10px 14px; border-radius: 0 6px 6px 0;\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAftermarket replacement waveguide cover — protects the magnetron opening and ensures even microwave distribution\u003c\/li\u003e\n\u003cli\u003eResolves \"sparking or arcing inside the cavity\" and \"uneven heating\" symptoms caused by a damaged cover\u003c\/li\u003e\n\u003cli\u003eMica construction — resistant to high temperature and corrosion, essentially invisible to microwave energy\u003c\/li\u003e\n\u003cli\u003eApproximately 4.88\" x 4.94\" (126mm x 124mm including tabs)\u003c\/li\u003e\n\u003cli\u003eLocking button\/pin tab for secure mounting\u003c\/li\u003e\n\u003cli\u003eDirect drop-in replacement matching the original mounting and dimensions\u003c\/li\u003e\n\u003cli\u003eReplaces MCK69074904, MCK69074902, 4957254, AP6888006, EAP12725272, ALG55468, PD00056750, PS12725272\u003c\/li\u003e\n\u003cli\u003eCompatible with LG and select Bosch microwaves\u003c\/li\u003e\n\u003cli\u003eAftermarket replacement built to OEM-equivalent quality standards\u003c\/li\u003e\n\u003cli\u003eSimple 15 to 30 minute repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003ctable class=\"pom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eXPMCK69074904\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003eMCK69074904\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Type\u003c\/td\u003e\n\u003ctd\u003eMicrowave Waveguide Cover \/ Insulator (Mica Plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eAftermarket Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMica\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eApprox. 4.88\" x 4.94\" (126mm x 124mm incl. tabs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eLocking button\/pin tab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eProtects the waveguide opening and ensures even microwave distribution\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRepair Difficulty\u003c\/td\u003e\n\u003ctd\u003eEasy — 15 to 30 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e1 waveguide cover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eLG, select Bosch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cdiv class=\"pom-warning\"\u003e\n\u003cstrong\u003e⚠️ Unplug Microwave Before Starting — Be Aware Of The High-Voltage Capacitor Inside\u003c\/strong\u003e Unplug the microwave from the wall outlet and move it away from the wall to give yourself room to work. Wear work gloves. Carefully remove the microwave's exterior cover, taking care not to tear or damage the clips that secure it in place, and set it aside. Microwave ovens contain a high-voltage capacitor that can retain a dangerous electrical charge even after the unit is unplugged — avoid touching internal components near the capacitor and magnetron while working inside the cabinet. Locate the old waveguide cover inside the cavity, typically secured by a locking tab or small screws depending on your model. Remove the old cover, taking care not to damage the surrounding cavity surface. Install the new MCK69074904 in the same position, making sure it seats flush and the locking tab engages securely. Reinstall the exterior cover, restore power, and run a quick test with a cup of water to confirm normal heating with no sparking or arcing. Tools needed: Phillips screwdriver (model-dependent), work gloves.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"pom-faq-item\"\u003e\n\u003cp class=\"pom-faq-q\"\u003eI see sparks inside my microwave. Is this the part I need?\u003c\/p\u003e\n\u003cp class=\"pom-faq-a\"\u003eYes, 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-faq-item\"\u003e\n\u003cp class=\"pom-faq-q\"\u003eIs it safe to keep using my microwave if I notice sparking?\u003c\/p\u003e\n\u003cp class=\"pom-faq-a\"\u003eNo, 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-faq-item\"\u003e\n\u003cp class=\"pom-faq-q\"\u003eWhat is mica, and why is it used for this part?\u003c\/p\u003e\n\u003cp class=\"pom-faq-a\"\u003eMica 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-faq-item\"\u003e\n\u003cp class=\"pom-faq-q\"\u003eIs this an OEM or aftermarket part?\u003c\/p\u003e\n\u003cp class=\"pom-faq-a\"\u003eThis 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pom-card pom-card-green\"\u003e\n\u003ch3\u003eShop With Confidence\u003c\/h3\u003e\n\u003cp\u003eA 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.\u003c\/p\u003e\n\u003cdiv class=\"pom-badges\"\u003e\n\u003cspan class=\"pom-badge\"\u003e✓ Quality Aftermarket Parts\u003c\/span\u003e \u003cspan class=\"pom-badge\"\u003e✓ Fast US Shipping\u003c\/span\u003e \u003cspan class=\"pom-badge\"\u003e✓ Compatibility Support\u003c\/span\u003e \u003cspan class=\"pom-badge\"\u003e✓ Secure Checkout\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"XPARTCO","offers":[{"title":"Default Title","offer_id":45991409221685,"sku":"XPMCK69074904","price":16.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0285\/1107\/6405\/files\/MCK69074904_3.png?v=1789135909","url":"https:\/\/expresspartsdirect.com\/products\/xpartco-mck69074904-microwave-waveguide-cover-insulator","provider":"Express Parts Direct","version":"1.0","type":"link"}