http://forum.lowyat.net/ Wed, 22 Jul 2026 21:24:28 +0800 FeedCreator 1.7.2 http://forum.lowyat.net/topic/3949199 Good Day all<br /><br />I followed the steps in the whole forum to repair and upgrade my S450 surround system but it didn&#39;t work <!--emo&:(--><img src='http://static.lowyat.net/style_emoticons/default/sad.gif' border='0' style='vertical-align:middle' alt='sad.gif' /><!--endemo--><br /><br />my problem wasn&#39;t directly with the power board, when my speakers started to die I turned it on one day then I heard sound of something exploding, then the sounds turn lower and the right channel was buzzing<br />after that day my sound system always turns on but have this buzzing sound problem.<br /><br />after reading what&#39;s written I decided to upgrade the whole components, I checked on the power board, it seems to be OK, no fat Capacitor or burned Diodes or exploded stuff, but I noticed the two Capacitors on the Amp Boards in sector C40 blown and burned.<br /><br />what I did that I changed most of the parts in the power supply board then some capacitors in the amp boards according to this list (founded earlier in the forum)<br /><br /><a href='https://onedrive.live.com/redir?resid=E2DDCEAB9C503CAF&#33;532&authkey=&#33;APvm4O6gW9zHxsU&ithint=file%2cdocx' target='_blank'>https://onedrive.live.com/redir?resid=E2DDC...int=file%2cdocx</a><br /><br />- First Repair Results:<br /><br />power on functioning correct and nothing exploded, but there&#39;s no sound at all from any speaker out &#33;&#33;<br /><br />- Possible causes:<br /><br />1 - some soldering points where so fragile, I may have cut/ruined the copper connections down some components on the power board within soldering?<br />2 - other contact point on the amp board where visibly damaged because of the hot soldering and I tried to fix them, but with I got the same results (that didn&#39;t encourage me to continue replacing the capacitors in the amp boards)<br /><br />- Reviewing and Checking for any possible Visible problems:<br /><br />re-check on every soldering points, cable connections... no visible harm, nothing more to do &#33;&#33;<br /><br />Please Help me find what to do else to complete this mess, I&#39;m so disappointed and exhausted from trying to find the problem with no results regarding that I spent 120 euros to buy the components and feeling useless unlucky.<br /><br />I can uploads photos for every thing I solder on the boards, please tell me what to do<br /><br />Thanks <br />Homer OE DarkThrone Audiophiles Tue, 17 May 2016 00:28:44 +0800