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Apple Computing Products:
macOS - Notebook Hardware
Proper way to check voltage rails on removed logic board?
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<blockquote data-quote="iggibar" data-source="post: 1850244" data-attributes="member: 97843"><p>The answer you are seeking is more specific than the generic info and question you stated.</p><p></p><p>1. Define 'hot'.</p><p>2. The are different voltage readings everywhere. What voltage reading are you trying to find? I'm assuming CPU?</p><p>3. The CPU doesn't always get the same amount of power. </p><p>4. What was the condition of the board when it was 'plugged in'? </p><p>5. A CPU on a logic board that doesn't have an SSD plugged in can run SUPER hot under some conditions. This is normal. The CPU will run on MAX power if there's no controller.</p><p></p><p>I can never recommend anyone play with electricity. You will NEVER find documentation from Apple that shows you how to do this. But if you are comfortable working with electronics, and are specifically looking for board diagrams for layouts so that you can find the contact points to read voltage ratings....here's how I go about it. Again, only if you feel comfortable....</p><p>1. There's an app called OpenBoardView. Search it on google and download it. </p><p>2. Search google for "820-3115-B boardview". Should come up within the first 3 hits. The file downloaded will be a '.brd" file and can only be opened with the OBV app. This will allow you to identify board-level components.</p><p>3. Now, go back to google and search for "820-3115-B Apple schematic". You will see a website that has the file for download right away. This file is a schematic for the COMPLETE electrical pathway for all logic board related components and connections. </p><p></p><p>Use them both together to trouble shoot problems and to help with your voltage checks.</p><p></p><p>Now I'm feeling super nice<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>This is the download page for <strong><a href="https://openboardview.org/" target="_blank">OpenBoardView</a></strong> for Mac. This download is offered free under license from the Massachusetts Institute of Technology. </p><p>This is the download page for the <strong><a href="https://www.apple-schematic.se/board/820-3115-macbook-pro-13-mid-2012/" target="_blank">820-3115-B boardview and schematic files</a></strong>. This download is offered for free by the amazing team at Apple Schematic.</p></blockquote><p></p>
[QUOTE="iggibar, post: 1850244, member: 97843"] The answer you are seeking is more specific than the generic info and question you stated. 1. Define 'hot'. 2. The are different voltage readings everywhere. What voltage reading are you trying to find? I'm assuming CPU? 3. The CPU doesn't always get the same amount of power. 4. What was the condition of the board when it was 'plugged in'? 5. A CPU on a logic board that doesn't have an SSD plugged in can run SUPER hot under some conditions. This is normal. The CPU will run on MAX power if there's no controller. I can never recommend anyone play with electricity. You will NEVER find documentation from Apple that shows you how to do this. But if you are comfortable working with electronics, and are specifically looking for board diagrams for layouts so that you can find the contact points to read voltage ratings....here's how I go about it. Again, only if you feel comfortable.... 1. There's an app called OpenBoardView. Search it on google and download it. 2. Search google for "820-3115-B boardview". Should come up within the first 3 hits. The file downloaded will be a '.brd" file and can only be opened with the OBV app. This will allow you to identify board-level components. 3. Now, go back to google and search for "820-3115-B Apple schematic". You will see a website that has the file for download right away. This file is a schematic for the COMPLETE electrical pathway for all logic board related components and connections. Use them both together to trouble shoot problems and to help with your voltage checks. Now I'm feeling super nice:) This is the download page for [B][URL="https://openboardview.org/"]OpenBoardView[/URL][/B] for Mac. This download is offered free under license from the Massachusetts Institute of Technology. This is the download page for the [B][URL="https://www.apple-schematic.se/board/820-3115-macbook-pro-13-mid-2012/"]820-3115-B boardview and schematic files[/URL][/B]. This download is offered for free by the amazing team at Apple Schematic. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Proper way to check voltage rails on removed logic board?
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