{"id":202,"date":"2010-02-14T12:24:09","date_gmt":"2010-02-14T17:24:09","guid":{"rendered":"http:\/\/djdan.hopto.org\/dan\/?p=202"},"modified":"2010-02-14T12:24:09","modified_gmt":"2010-02-14T17:24:09","slug":"home-device-repair","status":"publish","type":"post","link":"https:\/\/blog.danjoannis.com\/?p=202","title":{"rendered":"Home Device Repair"},"content":{"rendered":"

Hello again, it has been a little bit. College has picked up, and as I am moving in a little over a week, most of my projects have been packed. However, I’ve worked on a few things in the past little while.<\/p>\n

Remember my half-repaired LCD monitor<\/a>? Well recently I obtained yet another defective LCD monitor. Symptoms: no power, no lights, no noise. I may or may not post photos about this one, because I did all repairs without taking photos, and it was a pain to take it apart, and I wish not to do so again, hehe. Basically, the cause was 4 blown caps in on the circuit board, which I’ve replaced and it now functions fully, aside from a little squealing when in stand-by or turned off (I believe due to a capacitor that started blowing but that I measured to be within proper values.)<\/p>\n

\"LG<\/a><\/p>\n

A few months ago, however, I did document a repair project I undertook. I have two home theatre amps at home that I’ve had problems with. At one point, both had stopped functioning properly. So, naturally, I decided to set to fixing them.<\/p>\n

<\/p>\n

The first one shown, the problem was the right channel would cut out intermittently, and had gotten worse to the point where it was almost constant. I noticed that, by setting the balance to full right, and maxing the volume, I was able to “pop” the sound back into coming out. I realized that the issue was likely due to dirty contacts on the relay.<\/p>\n

\"Amp<\/a><\/p>\n

1) First step is to remove all the screws around the amp. The back, the bottom, the sides. Then, piece by piece, remove parts.<\/p>\n

\"Amp<\/a><\/p>\n

This is with the cover removed, we can see the relay (center, bottom).<\/p>\n

\"Front<\/a><\/p>\n

More screws, this time allowing us to remove the bottom tray.<\/p>\n

\"Bottom<\/a><\/p>\n

2) Now, the goal is to get access to the bottom of the motherboard, so that we can de-solder the defective\/malfunctioning component. The two red circles, erm, encircle the 6 pins that need to be de-soldered.<\/p>\n

\"Relay<\/a><\/p>\n

3) This is where ingenuity kicked in. In order to clean the relays, I can’t really simply open them up, and scrub\/use contact cleaner to clean the contacts. So, using the correct input voltage (24v), and some alligator clips, I repeatedly closed and opened the relay, for about a minute. I did it quickly, in the hopes that the movement and friction would cause whatever dust\/dirt was causing the problem to rub off.<\/p>\n

Well, I was right. That’s all it took, and the amp works like new again!<\/p>\n","protected":false},"excerpt":{"rendered":"

Hello again, it has been a little bit. College has picked up, and as I am moving in a little over a week, most of my projects have been packed. However, I’ve worked on a few things in the past little while. Remember my half-repaired LCD monitor? Well recently I obtained yet another defective LCD […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,7],"tags":[17,32,71,101,112,118],"class_list":["post-202","post","type-post","status-publish","format-standard","hentry","category-electronics","category-projects","tag-amp","tag-capacitors","tag-lcd","tag-relay","tag-soldering","tag-stereo"],"_links":{"self":[{"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=\/wp\/v2\/posts\/202","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=202"}],"version-history":[{"count":0,"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=\/wp\/v2\/posts\/202\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.danjoannis.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}