{"id":18960,"date":"2025-06-17T07:24:54","date_gmt":"2025-06-17T14:24:54","guid":{"rendered":"https:\/\/www.appliancepartspros.com\/b\/?p=18960"},"modified":"2026-07-14T12:39:43","modified_gmt":"2026-07-14T19:39:43","slug":"lg-washer-main-pcb-testing-and-replacement-repair-guide","status":"publish","type":"post","link":"https:\/\/www.appliancepartspros.com\/b\/lg-washer-main-pcb-testing-and-replacement-repair-guide\/","title":{"rendered":"LG Washer Main PCB Testing and Replacement Repair Guide"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Learn how to test and replace the main PCB on your LG front-load washer to fix power or control issues with this easy step-by-step guide.<\/p>\n","protected":false},"author":3,"featured_media":19287,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_aviaLayoutBuilderCleanData":"[av_image src='https:\/\/www.appliancepartspros.com\/b\/wp-content\/uploads\/2025\/06\/20250617_1022_Green-Control-Board_simple_compose_01jxz478gxeedsrs7wkygr4a4s-1500x630.png' attachment='19287' attachment_size='featured_large' copyright='' caption='' styling='' align='center' font_size='' overlay_opacity='0.4' overlay_color='#000000' overlay_text_color='#ffffff' animation='no-animation' hover='' appearance='' link='' target='' title_attr='' alt_attr='' lazy_loading='disabled' id='' custom_class='' av_element_hidden_in_editor='0' av_uid='av-1darfsg' admin_preview_bg=''][\/av_image]\r\n\r\n[av_textblock size='' av-medium-font-size='' av-small-font-size='' av-mini-font-size='' font_color='' color='' id='' custom_class='' av_uid='av-mbpemo41' admin_preview_bg='']\r\n<span style=\"font-weight: 400;\">Unexpected error codes? A <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/washing-machine-wont-start-top-7-problems-and-fixes-for-top-loading-and-side-loading-washers\/\"><span style=\"font-weight: 400;\">washer that won\u2019t start<\/span><\/a><span style=\"font-weight: 400;\"> or behaves erratically? When your LG front-load washer starts acting up, the main PCB (printed circuit board) might be to blame. This component controls everything from wash cycles to draining, and when it fails, your machine won\u2019t function properly. Whether you have a gas or electric model, we\u2019ll show you how to test and replace the main PCB to bring your washer back to life.<\/span>\r\n\r\n<span style=\"font-weight: 400;\">If you need any replacement parts for your <\/span><a href=\"https:\/\/www.appliancepartspros.com\/parts-for-lg-wm8000hva.html\"><b>LG washer<\/b><\/a><span style=\"font-weight: 400;\">, you can enter your <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/how-to-find-your-appliances-model-number\/\"><b>model number<\/b><\/a><span style=\"font-weight: 400;\"> at<\/span> <a href=\"https:\/\/www.appliancepartspros.com\/\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\"> to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.<\/span>\r\n\r\n<em><span style=\"font-weight: 400;\">The information in this article may not apply to your specific appliance model. We recommend consulting your manufacturer's documentation or<\/span><a href=\"https:\/\/www.appliancepartspros.com\/repair-help\/\"> <b>contact us<\/b><\/a><span style=\"font-weight: 400;\"> with any questions.<\/span><\/em>\r\n\r\n[lwptoc numeration=\"none\"]\r\n<p style=\"font-size:14.5px;margin:14px 0;font-family:system-ui,-apple-system,sans-serif\"><a href=\"#app-safety-notes\">Full safety notes below<\/a><\/p>\n\n<h2><span style=\"font-weight: 400;\">What you need<\/span><\/h2>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Phillips screwdriver<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Side cutters<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flatblade screwdriver<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Multimeter<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zip tie<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">Safety precautions<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Your safety should always be the top priority when performing any appliance repair.<\/span>\r\n<ul>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always power off and unplug your appliance or switch off the circuit breaker before you attempt any maintenance or replacement work. This keeps you safe by eliminating any risk of electric shock.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the appliance has recently been used, give it plenty of time to cool down before working on it.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take your time while working to prevent accidents and personal injuries. Rushing is the enemy of precision.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Work in a well-lit area so you can see and access appliance parts.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep your workspace free of clutter and other obstacles. Keep children and pets away from the work area.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Never work on internal parts with wet hands. Make sure the work area is completely dry.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check the user manual to see if there are specific installation or safety instructions related to your appliance or replacement part.\u00a0<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Be gentle when handling or removing parts. Excessive force might damage the appliance or cause personal injury.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wear insulated work gloves to protect your hands from sharp metal parts and debris.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Always take photos or make a note of wiring terminals or other connections before disconnecting them to make reassembly easier.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Don\u2019t test live voltage with a multimeter if you\u2019re unfamiliar with how to prevent short-circuiting.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Consider wearing safety glasses and\/or a dust mask when working with chemicals, dust or a large amount of debris to prevent irritation or injury.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Turn off the water supply at the outlet before beginning repairs. Keep towels ready to catch any residual water in the system when removing parts.<\/span><\/li>\r\n<\/ul>\r\n<h2><span style=\"font-weight: 400;\">How to test and replace the LG front-load washer\u2019s main PCB<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Here are the steps to test the main PCB for voltage issues and replace it if necessary. Follow each step carefully to complete the process safely and correctly.<\/span>\r\n<h3><span style=\"font-weight: 400;\">Step 1. Access the main PCB<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unplug the washer from the power source.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the rear access panel on the back of the washer.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a Phillips screwdriver to remove the four screws securing the panel.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Push the panel upward and lift it off to expose the internal components.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Step 2. Test the main PCB<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Locate the motor harness at the rear of the washer.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trace the harness to the left side of the rotor.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identify the RPS four-wire plug containing White, Blue, Grey, and Red wires.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Set the multimeter to Volts DC (V with two lines on top).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insert the multimeter probes into the White and Grey terminals.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Plug the washer back into the power outlet.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Close the washer door.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Press the POWER button on the control panel without pressing the START button.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check the multimeter reading.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the reading is between 10 to 15 VDC, the Main PCB and wiring are functional.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the reading is 0 VDC, test the motor harness for continuity.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the harness is intact, replace the main PCB.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Step 3. Remove the main PCB<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unplug the washer from the power source.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the top panel by locating and removing the two lower screws from the rear plastic brackets using a Phillips screwdriver.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slide the top panel back less than an inch and lift it off.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Undo the wire tie or push-in retainer from the top bracket.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Detach the black air hose from the water level switch and the clip.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use side cutters to cut the zip tie securing the harness.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the Phillips screw in the upper right corner of the PCB housing (viewed from the back).<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slide the control left, push up, and pull it out.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Free the harness along the side of the PCB housing.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use a flat-blade screwdriver to release the top and side tabs of the PCB cover.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remove the PCB cover and place it aside.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Take photos of the current PCB connections for reference.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Disconnect all wire plugs from the old PCB.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pull out the old PCB from its mount.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Step 4. Install the new main PCB<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Connect all plugs to the new PCB, referring to the photos taken earlier.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check that all connectors are intact and fully inserted into the PCB.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Place the harness in the cutouts and lock the cover onto the PCB.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Run the side harness into the clip.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mount the PCB through the rear panel and slide it to the side to lock it in place.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Secure the PCB with a single Phillips screw from the back.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zip-tie the harness to the cover and use side cutters to trim off the excess.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Run the black air hose through the clip and reinstall it onto the water level switch.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wire-tie the harness to the bar for proper organization.<\/span><\/li>\r\n<\/ol>\r\n<h3><span style=\"font-weight: 400;\">Step 5. Reassemble<\/span><\/h3>\r\n<ol>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reinstall the top panel by sliding it forward to lock it into place.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Secure the top panel with two Phillips screws at the back.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Plug the washer back into the power outlet.<\/span><\/li>\r\n \t<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Press the POWER button and check for normal operation.<\/span><\/li>\r\n<\/ol>\r\n<h2><span style=\"font-weight: 400;\">We\u2019re here to help<\/span><\/h2>\r\n<span style=\"font-weight: 400;\">Thanks for following along! We hope this guide made testing and replacing the <\/span><span style=\"font-weight: 400;\">main PCB <\/span><span style=\"font-weight: 400;\">in your <\/span><span style=\"font-weight: 400;\">LG front-load washer <\/span><span style=\"font-weight: 400;\">a bre<\/span><span style=\"font-weight: 400;\">eze. If you still need parts, bring your model number on over to <\/span><a href=\"http:\/\/appliancepartspros.com\"><b>AppliancePartsPros.com<\/b><\/a><span style=\"font-weight: 400;\">, where you\u2019ll find millions of parts in stock and fast shipping\u2014most arrive in only two days! If you have questions, you can reach us at 1 (877) 477-7278 or chat with us online. Make sure to swing by <\/span><a href=\"https:\/\/www.appliancepartspros.com\/b\/\"><b>our DIY blog<\/b><\/a> <span style=\"font-weight: 400;\">and <\/span><a href=\"https:\/\/www.youtube.com\/@appliancepartspros\/videos\"><b>YouTube channel<\/b><\/a><span style=\"font-weight: 400;\"> for more repair tips. And don\u2019t miss out\u2014follow us on <\/span><a href=\"http:\/\/facebook.com\/appliancepartspros\"><b>Facebook<\/b><\/a><span style=\"font-weight: 400;\">, <\/span><a href=\"https:\/\/twitter.com\/applpartspros\"><b>X<\/b><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/instagram.com\/appliancepartspros?igshid=OGQ5ZDc2ODk2ZA==\"><b>Instagram<\/b><\/a><span style=\"font-weight: 400;\"> to see our latest and greatest!<\/span>\n\n<div id=\"app-safety-notes\" style=\"border:1px solid #E6E6E6;border-radius:8px;overflow:hidden;margin:22px 0;font-family:system-ui,-apple-system,sans-serif\"><div style=\"background:#1C437C;color:#fff;padding:9px 16px;font-weight:700;font-size:15px\">\u26a1&nbsp;Electrical safety \u2014 before you start<\/div><ul style=\"margin:0;padding:14px 20px 14px 38px;font-size:15px;line-height:1.6;color:#1A1A1A;background:#fff\"><li style=\"margin:6px 0\"><b>Disconnect power<\/b> before you start \u2014 unplug it or switch off the breaker, and <b>confirm it's dead<\/b>.<\/li><li style=\"margin:6px 0\">Follow your <b>local electrical code<\/b>.<\/li><li style=\"margin:6px 0\">Anything involving <b>household wiring, outlets, or the breaker panel<\/b> itself is <b>licensed-electrician territory<\/b>.<\/li><\/ul><\/div>\n[\/av_textblock]\r\n\r\n[av_blog blog_type='posts' categories='9' link='category' blog_style='blog-grid' content_length='content' contents='title_read_more' date_filter='' date_filter_start='' date_filter_end='' date_filter_format='yy\/mm\/dd' offset='0' conditional='' bloglist_width='' columns='3' preview_mode='auto' image_size='portfolio' items='3' paginate='yes' lazy_loading='disabled' alb_description='' id='' custom_class='' av_uid='av-mbuuueok']\r\n\r\n[av_social_share title='Share this entry' buttons='' share_facebook='' share_twitter='' share_whatsapp='' share_pinterest='' share_reddit='' share_linkedin='' share_tumblr='' share_vk='' share_mail='' share_yelp='' yelp_link='https:\/\/www.yelp.com' style='' av-desktop-hide='' av-medium-hide='' av-small-hide='' av-mini-hide='' alb_description='' id='' custom_class='' av_uid='av-wbfju8']\r\n\r\n","_aviaLayoutBuilder_active":"active","footnotes":""},"categories":[84,9],"tags":[11811,11804,11806,11810,11803,11805,11808,11809,11807,11212],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>LG Washer Main PCB Testing and Replacement Repair Guide<\/title>\r\n<meta name=\"description\" content=\"Learn how to test and replace the main PCB on your LG front-load washer to fix power or control issues with this easy step-by-step guide.\" \/>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.appliancepartspros.com\/b\/lg-washer-main-pcb-testing-and-replacement-repair-guide\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta 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