{"id":70,"date":"2011-04-24T09:01:41","date_gmt":"2011-04-24T09:01:41","guid":{"rendered":"http:\/\/goodenoughforjesus.com\/?p=70"},"modified":"2018-01-20T22:28:30","modified_gmt":"2018-01-20T22:28:30","slug":"fiddling-with-junk-instead-of-buying-new-stuff","status":"publish","type":"post","link":"http:\/\/goodenoughforjesus.com\/?p=70","title":{"rendered":"Fiddling with junk instead of buying new stuff"},"content":{"rendered":"

Rather than doing real work and making money, I decided to take another crack at fixing my junk.<\/p>\n

I’ve got a 17in LCD that I had to replace the backlight on, I swapped in the board from another LCD. \u00a0At that point it worked fine, but sometimes it doesn’t sleep and just glows brightly.<\/p>\n

The backlight on\/off line for the inverter strapped on the back is something like 1.5v trigger… I know ~1.65v will put it high, and I know it’s low at 0.6v, but past that I really don’t know. \u00a0Back when I hooked it up I just found a line inside the monitor that was low when the monitor was off\/asleep, and around 2v when it was supposed to be awake… unfortunately that line sometimes mysteriously goes really high when it’s asleep, ~3v.<\/p>\n

I’d already checked the internals on the board that had the original inverters, power supply circuit, and speaker amplifier circuit a couple of times, there are almost no places to pull a voltage\/signal that even changes when the monitor is on or off! \u00a0The closest stuff I could find are several leads that go from 0v to 3v for a few seconds when you turn the monitor on, then drop back to 0v.<\/div>\n
I didn’t find anything different this time around, but this time I took another look at the “brains” board that handles video processing and the OSD and stuff… I’d seen before that the power-on LED could be used, but I hated to draw a signal off of the LED power lead. \u00a0Instead this time I traced it back to the transistor that lights up the LED and used the signal line that goes to\u00a0that<\/em> to signal the LCD inverter on\/off. \u00a0It was something like 0v low and 3v high, seems to be working great.<\/div>\n
<\/div>\n
If that didn’t work I was going to wire in a physical toggle switch, heh.<\/div>\n","protected":false},"excerpt":{"rendered":"

Rather than doing real work and making money, I decided to take another crack at fixing my junk. I’ve got a 17in LCD that I had to replace the backlight on, I swapped in the board from another LCD. \u00a0At … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-70","post","type-post","status-publish","format-standard","hentry","category-tinkering"],"_links":{"self":[{"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=\/wp\/v2\/posts\/70","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=70"}],"version-history":[{"count":3,"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=\/wp\/v2\/posts\/70\/revisions"}],"predecessor-version":[{"id":86,"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=\/wp\/v2\/posts\/70\/revisions\/86"}],"wp:attachment":[{"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=70"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=70"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/goodenoughforjesus.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=70"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}