{"id":26231,"date":"2020-07-19T12:08:15","date_gmt":"2020-07-19T16:08:15","guid":{"rendered":"https:\/\/pappp.net\/?p=26231"},"modified":"2020-07-19T15:19:40","modified_gmt":"2020-07-19T19:19:40","slug":"apple-12%e2%80%b3-macintosh-rgb-monitor-recap","status":"publish","type":"post","link":"https:\/\/pappp.net\/?p=26231","title":{"rendered":"Apple 12\u2033 Macintosh RGB Monitor Recap"},"content":{"rendered":"\n<p>This post is a retro post on a retro topic &#8211; a repair I did in 2017 on a monitor made in 1991.  I got a question about (probably) the same problem in another venue and realized I never put it online.  I managed to dig up my pictures and notes, so there is useful information to be shared.   <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"696\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2016\/03\/DeadRGB.jpg\" alt=\"\" class=\"wp-image-1536\"\/><figcaption>My  12&#8243; RGB Display is getting sad. <\/figcaption><\/figure>\n\n\n\n<p>The end of my (2016) post about <a href=\"https:\/\/pappp.net\/?p=1530\">Recapping my Macintosh LC<\/a> I discovered that my matching Apple 12\u2033 Macintosh RGB Monitor ( M1296 ) was going pear-shaped, and speculated that I&#8217;d need to recap it.   <\/p>\n\n\n\n<!--more-->\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26236\"><img loading=\"lazy\" decoding=\"async\" width=\"725\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews-725x1024.jpg\" alt=\"\" data-id=\"26236\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26236\" class=\"wp-image-26236\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews-725x1024.jpg 725w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews-212x300.jpg 212w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews-768x1085.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews-1088x1536.jpg 1088w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews-1450x2048.jpg 1450w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardScrews.jpg 1688w\" sizes=\"auto, (max-width: 725px) 100vw, 725px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">The bottom screws are awkwardly recessed.<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26235\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"829\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips-1024x829.jpg\" alt=\"\" data-id=\"26235\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26235\" class=\"wp-image-26235\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips-1024x829.jpg 1024w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips-300x243.jpg 300w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips-768x622.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips-1536x1244.jpg 1536w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AwkwardClips-2048x1658.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">There are slightly obnoxious clips to pop around the edge. <\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26240\"><img loading=\"lazy\" decoding=\"async\" width=\"642\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-642x1024.jpg\" alt=\"\" data-id=\"26240\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-scaled.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26240\" class=\"wp-image-26240\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-642x1024.jpg 642w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-188x300.jpg 188w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-768x1225.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-963x1536.jpg 963w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-1284x2048.jpg 1284w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Innards-scaled.jpg 1605w\" sizes=\"auto, (max-width: 642px) 100vw, 642px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">Yup, It&#8217;s a compact CRT full of high voltage parts.<\/figcaption><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>About a year later, I got around to fixing it.  Unlike the LC itself, the M1296 is <em>distinctly not<\/em> designed to be easy or tool-less to service (that&#8217;s fair, it&#8217;s a CRT).  It has some awkwardly recessed screws, clips around the opening edge, and un-keyed connectors that make it challenging to work on.  I found a couple tips on the Internet (one from <a href=\"https:\/\/www.youtube.com\/user\/THEtechknight\/videos\">techknight<\/a> who had the same problem plus some cascading damage and posted video of their diagnosis\/repair) that the most likely culprit was a 2200\u03bcF 6.3v electrolytic at C418 on the main board, and ordered some 2200\u03bcF 10V caps to replace it ahead of time. <\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26243\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"868\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement-1024x868.jpg\" alt=\"\" data-id=\"26243\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26243\" class=\"wp-image-26243\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement-1024x868.jpg 1024w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement-300x254.jpg 300w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement-768x651.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement-1536x1302.jpg 1536w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/SuitableReplacement.jpg 1991w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">Suitable replacement.  Same value, &gt;= voltage, similar package size. <\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26241\"><img loading=\"lazy\" decoding=\"async\" width=\"868\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418-868x1024.jpg\" alt=\"\" data-id=\"26241\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26241\" class=\"wp-image-26241\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418-868x1024.jpg 868w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418-254x300.jpg 254w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418-768x906.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418-1302x1536.jpg 1302w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/OriginalC418.jpg 1688w\" sizes=\"auto, (max-width: 868px) 100vw, 868px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">The original C418 looking innocuous from the top. <\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26237\"><img loading=\"lazy\" decoding=\"async\" width=\"839\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage-839x1024.jpg\" alt=\"\" data-id=\"26237\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26237\" class=\"wp-image-26237\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage-839x1024.jpg 839w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage-246x300.jpg 246w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage-768x937.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage-1259x1536.jpg 1259w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage-1678x2048.jpg 1678w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/CapacitorDamage.jpg 1688w\" sizes=\"auto, (max-width: 839px) 100vw, 839px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">Damage from the capacitor leak on the back.<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26238\"><img loading=\"lazy\" decoding=\"async\" width=\"756\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup-756x1024.jpg\" alt=\"\" data-id=\"26238\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26238\" class=\"wp-image-26238\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup-756x1024.jpg 756w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup-222x300.jpg 222w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup-768x1040.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup-1134x1536.jpg 1134w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup-1513x2048.jpg 1513w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Cleanup.jpg 1616w\" sizes=\"auto, (max-width: 756px) 100vw, 756px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">Most of the capacitor sludge cleaned up, slight harm to the solder mask. <\/figcaption><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>Those tips were good, there was a pool of capacitor goo around C418 and no other visible damage.  I removed the remains of the original cap, cleaned the board out out as best I could with Isopropyl alcohol, and put in one of my replacements, and it has been working fine since.  <\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-3 is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26234\"><img loading=\"lazy\" decoding=\"async\" width=\"667\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-667x1024.jpg\" alt=\"\" data-id=\"26234\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-rotated.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26234\" class=\"wp-image-26234\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-667x1024.jpg 667w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-195x300.jpg 195w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-768x1180.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-1000x1536.jpg 1000w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-1333x2048.jpg 1333w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepariBottom-rotated.jpg 1463w\" sizes=\"auto, (max-width: 667px) 100vw, 667px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">New capacitor installed, legs not yet clipped.  The PCB has a little damage, but the worst of it cleaned up. <\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26233\"><img loading=\"lazy\" decoding=\"async\" width=\"576\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-576x1024.jpg\" alt=\"\" data-id=\"26233\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-scaled.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26233\" class=\"wp-image-26233\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-576x1024.jpg 576w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-169x300.jpg 169w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-768x1365.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-864x1536.jpg 864w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-1152x2048.jpg 1152w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/AfterRepairTop-scaled.jpg 1440w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">New capacitor nestled into place. <\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><a href=\"https:\/\/pappp.net\/?attachment_id=26242\"><img loading=\"lazy\" decoding=\"async\" width=\"989\" height=\"1024\" src=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired-989x1024.jpg\" alt=\"\" data-id=\"26242\" data-full-url=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired.jpg\" data-link=\"https:\/\/pappp.net\/?attachment_id=26242\" class=\"wp-image-26242\" srcset=\"https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired-989x1024.jpg 989w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired-290x300.jpg 290w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired-768x795.jpg 768w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired-1483x1536.jpg 1483w, https:\/\/pappp.net\/wp-content\/uploads\/2020\/07\/Repaired.jpg 1688w\" sizes=\"auto, (max-width: 989px) 100vw, 989px\" \/><\/a><figcaption class=\"blocks-gallery-item__caption\">All good!<\/figcaption><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p>I found a 2019 post from JBRetro with a full <a href=\"https:\/\/jbretro.wordpress.com\/2019\/07\/10\/m1296-recap\/\">Re-Cap list<\/a> for the M1296, and they had the same known bad capacitor, so it seems to be a repeatable weak point.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post is a retro post on a retro topic &#8211; a repair I did in 2017 on a monitor made in 1991. I got a question about (probably) the same problem in another venue and realized I never put &hellip; <a href=\"https:\/\/pappp.net\/?p=26231\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,8,37,1],"tags":[],"class_list":["post-26231","post","type-post","status-publish","format-standard","hentry","category-computers","category-diy","category-electronics","category-general"],"_links":{"self":[{"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/posts\/26231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=26231"}],"version-history":[{"count":0,"href":"https:\/\/pappp.net\/index.php?rest_route=\/wp\/v2\/posts\/26231\/revisions"}],"wp:attachment":[{"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=26231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=26231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pappp.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=26231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}