Repairing a JBL LSR308 studio monitor speaker.<br />Digital troubleshooting in a speaker? Yep, that's a thing!<br />How to systematically track down a fault and *know* that part has failed.<br /><br />Full 55min video: https://www.youtube.com/watch?v=XQgoss_adIo<br /><br />Forum: https://www.eevblog.com/forum/blog/eevblog-1322-jbl-lsr308-studio-monitor-speaker-repair/<br /><br />00:00 - Introduction<br />01:55 - Inside<br />04:42 - The chips<br />07:05 - Voltage checks<br />07:58 - Safety protection<br />08:18 - Oscilloscope time<br />10:29 - ADC checks<br />11:59 - Signal injection testing<br />13:08 - Power amp DSP debugging<br />15:35 - External load checks<br />19:21 - Suspect identified<br />20:05 - Rework Desoldering<br />24:28 - Component replacement soldering<br />27:01 - Winner Winner Chicken Dinner<br /><br />EEVblog Main Web Site: http://www.eevblog.com<br />The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2<br /><br />Support the EEVblog through Patreon!<br />http://www.patreon.com/eevblog<br /><br />AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g<br />Buy anything through that link and Dave gets a commission at no cost to you.<br /><br />Donate With Bitcoin & Other Crypto Currencies!<br />https://www.eevblog.com/crypto-currency/<br /><br />T-Shirts: http://teespring.com/stores/eevblog
