EEVblog #1322 - JBL LSR308 Studio Monitor Speaker REPAIR

Repairing a JBL LSR308 studio monitor speaker.
Digital troubleshooting in a speaker? Yep, that's a thing!
How to systematically track down a fault and *know* that part has failed.

Full 55min video: https://www.youtube.com/watch?v=XQgoss_adIo

Forum: https://www.eevblog.com/forum/blog/eevblog-1322-jbl-lsr308-studio-monitor-speaker-repair/

00:00 - Introduction
01:55 - Inside
04:42 - The chips
07:05 - Voltage checks
07:58 - Safety protection
08:18 - Oscilloscope time
10:29 - ADC checks
11:59 - Signal injection testing
13:08 - Power amp DSP debugging
15:35 - External load checks
19:21 - Suspect identified
20:05 - Rework Desoldering
24:28 - Component replacement soldering
27:01 - Winner Winner Chicken Dinner

EEVblog Main Web Site: http://www.eevblog.com
The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2

Support the EEVblog through Patreon!
http://www.patreon.com/eevblog

AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g
Buy anything through that link and Dave gets a commission at no cost to you.

Donate With Bitcoin & Other Crypto Currencies!
https://www.eevblog.com/crypto-currency/

T-Shirts: http://teespring.com/stores/eevblog