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	<title>MindSuburbia &#187; Circuits and soldering</title>
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		<title>Samsung E700 final repair: flex switch failed!</title>
		<link>http://www.mindsuburbia.net/2009/10/28/368/</link>
		<comments>http://www.mindsuburbia.net/2009/10/28/368/#comments</comments>
		<pubDate>Wed, 28 Oct 2009 18:31:14 +0000</pubDate>
		<dc:creator>MindSuburbian</dc:creator>
				<category><![CDATA[Circuits and soldering]]></category>
		<category><![CDATA[Tecnology]]></category>
		<category><![CDATA[broken]]></category>
		<category><![CDATA[display]]></category>
		<category><![CDATA[e700]]></category>
		<category><![CDATA[flex]]></category>
		<category><![CDATA[poor man's]]></category>
		<category><![CDATA[repair]]></category>
		<category><![CDATA[samsung]]></category>
		<category><![CDATA[samsung flex]]></category>
		<category><![CDATA[solder]]></category>
		<category><![CDATA[spare]]></category>
		<category><![CDATA[switch flex]]></category>
		<category><![CDATA[unsolder]]></category>

		<guid isPermaLink="false">http://www.mindsuburbia.net/?p=368</guid>
		<description><![CDATA[Hey, it was back in 2006, when I first posted about my Samsung E700 poor man&#8217;s repairing. Back then I was able to make the poor phone flex work for another couple of months. Now here&#8217;s a new curious story: how I tried the flex switch. When you need most your mobile phone I was [...]]]></description>
			<content:encoded><![CDATA[<p>Hey, it was back in 2006, when I first posted about my <a href="http://www.mindsuburbia.net/2006/10/09/33/">Samsung E700 poor man&#8217;s repairing</a>.<br />
Back then I was able to make the poor phone flex work for another couple of months.</p>
<p>Now here&#8217;s a new curious story: how I tried the flex switch.</p>
<p><strong>When you need most your mobile phone</strong><br />
<br />
I was riding my bike back home with my good old Motorola C650 when I dropped it without knowing that.<br />
It turned out it was smashed by some vehicle some time later and a man doing jogging found it.<br />
<br />
Crazy enough he tried to use it, but nothing was showing up on the display.</p>
<blockquote><p><em>Hey, what the hack is this story about? That&#8217;s insanely out of topic!!</em>
</p></blockquote>
<p>Yes, I know, but if you want the real thing, you&#8217;ll have to read thru this&#8230;<br />
So: finally the wise man put my SIM back in his phone and called the &#8220;home&#8221; contact.<br />
Yep, I definitely answered. I wasn&#8217;t even aware I had lost the phone! Anyways to cut it out my phone came back into my hands! Thanx Marco!!! <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_biggrin.gif' alt=':-D' class='wp-smiley' /><br />
I guess it wasn&#8217;t much of a gain, keeping a not working mobile! <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>I was really happy because I got back my 15EUR worth of calls on my SIM and the phone, though broken, seemed still usable.<br />
After a cose look, it seemed the display was broken, so i thought: just try to place a call just to be sure a display switch will do the trick.<br />
Nope, the phone does not place nor receive calls: I don&#8217;t think that a new display is a good idea!</p>
<p>But&#8230;. <strong>BUT!</strong> Hey, I got that nice E700 back in my closet, waiting for an extreme repair!!!</p>
<p><strong>The real thing</strong><br />
I decided it was time to get my E700 back to work, so i ordered a new E700 flex (without displays) and I tried to unsolder the main display and to solder it back on the new flex.</p>
<p><strong>Failure</strong><br />
Yep, I failed!</p>
<p><a href="http://www.mindsuburbia.net/2009/10/28/368/e700flex/" rel="attachment wp-att-378"><img src="http://www.mindsuburbia.net/wp-content/uploads/2009/10/e700flex-300x121.jpg" alt="E700 dismantled flex" title="E700 dismantled flex" width="300" height="121" class="alignleft size-medium wp-image-378" /></a></p>
<p>First of all the external display: it is just stitched on the board. I don&#8217;t know you, but i&#8217;ve seen tens of electronic caluclators and the always have this absurd way of stitching the display or the solar cells: that&#8217;s the same on the external display.<br />
The bad thing is that you&#8217;ll never get your stitched contacts back! They just get disintegrated <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_sad.gif' alt=':-(' class='wp-smiley' /> </p>
<p>No problem, the main thing is the internal display, or i&#8217;ll never be able to use my phone again.<br />
Well the display has a nice soldered couple of contacts for power, so with wathever solder you have, you&#8217;ll be able to detach that.<br />
The real problem is when you try to unsolder the data contacts: impossible, you risk to end up with a cut out piece of plastic.</p>
<p><a href="http://www.mindsuburbia.net/2009/10/28/368/e700displays/" rel="attachment wp-att-377"><img src="http://www.mindsuburbia.net/wp-content/uploads/2009/10/e700displays-300x275.jpg" alt="E700 displays" title="E700 displays" width="300" height="275" class="alignleft size-medium wp-image-377" /></a></p>
<p>Well I wanted to try anyways, so I started soldering everything and found a decent status to test: nothing. Pure black (except for the white backlight leds).</p>
<p><a href="http://www.mindsuburbia.net/2009/10/28/368/e700flexpowered/" rel="attachment wp-att-379"><img src="http://www.mindsuburbia.net/wp-content/uploads/2009/10/e700flexpowered-300x156.jpg" alt="E700 Flex Repair Powered" title="E700 Flex Repair Powered" width="300" height="156" class="alignleft size-medium wp-image-379" /></a></p>
<p><strong>Conclusion</strong><br />
First: don&#8217;t even think of doing that if you don&#8217;t have the right tools</p>
<p>Second: even if you have the right tools be aware that anything could go wrong (expecially with the stitched external display). For the internal display here&#8217;s what may go wrong (in order of probability):<br />
- wrong unsoldering: contacts broken<br />
- wrong soldering: solder may damage your phone<br />
- defective flex: you might to the thing perfect, but something&#8217;s not working</p>
<p><a href="http://www.mindsuburbia.net/2009/10/28/368/e700brokenflex/" rel="attachment wp-att-376"><img src="http://www.mindsuburbia.net/wp-content/uploads/2009/10/e700brokenflex-300x151.jpg" alt="E700 broken flex" title="E700 broken flex" width="300" height="151" class="alignleft size-medium wp-image-376" /></a></p>
<p>Third: you could just simply buy a complete display spare for less than 15EUR and just connect it (after having read my <a href="http://www.mindsuburbia.net/2006/10/09/33/">guide</a> on dismounting the phone <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' />  )</p>
<p>Happy bidding! Can&#8217;t wait to try my spare&#8230; <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_biggrin.gif' alt=':-D' class='wp-smiley' /> </p>
<p><a class="a2a_dd addtoany_share_save" href="http://www.addtoany.com/share_save"><img src="http://www.mindsuburbia.net/wp-content/plugins/add-to-any/share_save_171_16.png" width="171" height="16" alt="Share/Bookmark"/></a> </p><h3  class="related_post_title">Related posts</h3><ul class="related_post"><li><a href="http://www.mindsuburbia.net/2010/01/11/385/" title="Samsung E700 finally working">Samsung E700 finally working</a> (0)</li></ul>]]></content:encoded>
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		<item>
		<title>Fonera Zombie Antenna</title>
		<link>http://www.mindsuburbia.net/2009/03/13/139/</link>
		<comments>http://www.mindsuburbia.net/2009/03/13/139/#comments</comments>
		<pubDate>Fri, 13 Mar 2009 18:40:36 +0000</pubDate>
		<dc:creator>MindSuburbian</dc:creator>
				<category><![CDATA[Circuits and soldering]]></category>
		<category><![CDATA[antenna]]></category>
		<category><![CDATA[dd-wrt]]></category>
		<category><![CDATA[fix]]></category>
		<category><![CDATA[fonera]]></category>
		<category><![CDATA[revive]]></category>

		<guid isPermaLink="false">http://www.mindsuburbia.net/?p=139</guid>
		<description><![CDATA[A couple of months ago my Fonera 2200 gave up her job It was an original Fonera in her v.0.7.2r3 firmware, no ssh enabled, nothing else added: just a Fontenna. It all started with a loss of signal: the Fonera was active just for a couple of seconds a minute, like it was auto rebooting. [...]]]></description>
			<content:encoded><![CDATA[<p>A couple of months ago my Fonera 2200 gave up her job <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_sad.gif' alt=':(' class='wp-smiley' /><br />
It was an original Fonera in her v.0.7.2r3 firmware, no ssh enabled, nothing else added: just a Fontenna.<br />
It all started with a loss of signal: the Fonera was active just for a couple of seconds a minute, like it was auto rebooting.<br />
I tried a couple of reboot and I also tried to switch to the original little white antenna: nothing changed.<br />
Then, after a lot of trying, i noticed this behaviour: the Fonera was working all right only <strong>without antenna</strong>! The signal strength was very low, but stable and working. So there must have been something in the amplifying signal circuit that short circuited the antenna. I can&#8217;t believe it&#8217;s something due to software.<br />
Opening the Fonera case, the antenna cable and connector were perfectly fixed and soldered.<br />
So i did the most obvious things:</p>
<ul>
<li>Wrote to the FON support, after checking the knowledge base</li>
<li>Started searching around if someone noticed the same behaviour</li>
</ul>
<p>After a couple of days i got <strong>no answer from FON</strong> (they claim to answer within 24hrs) and found noone with the same story, so I just gave up and selected my Fonera for my test expendable device <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /> </p>
<p>I documented a bit on the DD-WRT project, so to be prepared on what i could obtain, and I actually found the <strong>the Fonera has two antennas</strong> and they are operational!<br />
One may just solder to a connector to the second antenna contact, like shown in the image.<br />
<a href="http://www.mindsuburbia.net/wp-content/uploads/2009/03/fonera_ant.jpg"><img src="http://www.mindsuburbia.net/wp-content/uploads/2009/03/fonera_ant-150x150.jpg" alt="Fonera second antenna" title="Fonera second antenna" width="150" height="150" class="alignnone size-thumbnail wp-image-143" /></a></p>
<p>Unfortunately the FON firmware can&#8217;t see that and will never use a second antenna, so the only choice is to install an alternative firmware: DD-WRT.</p>
<p>So i begun this Zonera Zombie project:</p>
<ul>
<li>I studied the second circuit and it seemed straightforward</li>
<li>I desoldered the antenna from the ant2 contact</li>
<li>Resoldered the antenna cable to the ant1 contact</li>
<li>Hard reset the Fonera to the original firmware (v.0.7.1r1) pressing the reset button at the bottom of the case <strong>for 20 seconds</strong> (less tha 15 seconds and the reset wouldn&#8217;t stard and more than 25 seconds will just soft reset the fonera)</li>
<li>Enabled SSH with the HTML injection trick</li>
<li>Enabled redboot</li>
<li>Installed DD-WRT v24SP1</li>
<li>Enabled <em>diversity</em>, which lets you choose which antenna use for TX and which for RX, then selected the <strong>second antenna for both</strong> RX and TX</li>
</ul>
<p>And that was it! When i connected the external antenna it started working like a charm! <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_biggrin.gif' alt=':-D' class='wp-smiley' /><br />
You might want to install the thinclient software for letting FON see the fonera online and that&#8217;s it! <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /> </p>
<p>So why write now?!?<br />
Well you know, I got another not-working fonera a couple of days ago and, guess what? <strong>It has the exact same behaviour</strong>.<br />
Why the heck nobody ever tried to use the Fonera without the antenna and notice the behaviour? </p>
<p>I did the same Zombie revival and it worked!<br />
&#8220;Ahahah, it lives, it lives!!!&#8221; <img src='http://www.mindsuburbia.net/wp-includes/images/smilies/icon_biggrin.gif' alt=':-D' class='wp-smiley' /> </p>
<p>Hey, I know a lot of ppl with a not working Fonera and suggest you try that on yours!</p>
<p><a class="a2a_dd addtoany_share_save" href="http://www.addtoany.com/share_save"><img src="http://www.mindsuburbia.net/wp-content/plugins/add-to-any/share_save_171_16.png" width="171" height="16" alt="Share/Bookmark"/></a> </p><h3  class="related_post_title">Related posts</h3><ul class="related_post"><li><a href="http://www.mindsuburbia.net/2009/05/08/256/" title="Apple patents make me wander">Apple patents make me wander</a> (1)</li></ul>]]></content:encoded>
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