How to diagnose faults methodically, Practical Example PART 2 HK Audio Lucas Nano 600 Protect Error

I have a Powered speaker system stuck in protect mode. There are no schematics and the cause of the fault is not obvious. Can I fix it? Part 1 is here    • How to diagnose faults methodically, no sc...   I work in collaboration with: The Electronics Channel (with Carlos and Detlef)    / @theelectronicschannel   Gran Canaria Uncovered    / @grancanariauncovered   (with Detlef and Julie. Not electronics related) Det Builds Stuff -    / @detbuildsstuff8128   (Detlef) Retro Upgrade -    / @retroupgrade   (Carlos) 👉Click on the link https://s.click.aliexpress.com/e/_EvY... or enter the search code [AYGNN4] on the AliExpress homepage and don't forget to enjoy extra savings with the exclusive discount codes below. 🌟 Remember, these codes can be used on almost all items in selected countries on AliExpress. $3 off on orders over $29:【IFP9R2LA】 $6 off on orders over $59:【IFPCRNHA】 $9 off on orders over $89:【IFPKOS53】 $16 off on orders over $149:【IFPKB8ST】 $23 off on orders over $199:【IFPGX1QP】 $30 off on orders over $269:【IFPF08I5】 $40 off on orders over $369:【IFPE3N2J】 $50 off on orders over $469:【IFPJXACE】 $60 off on orders over $599:【IFPT9KEP】 $70 off on orders over $699:【IFPHKAMQ】 Valid until 1st July 2026 For All Your PCB needs: free $5 discount coupon https://www.pcbway.com/setinvite.aspx... Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission. DM40C https://s.click.aliexpress.com/e/_c4q... Aneng AN870 (Same as Zoyi ZT219) https://s.click.aliexpress.com/e/_c2w... Zoyi ZT-DQ02 https://s.click.aliexpress.com/e/_oB2... WinAPEX 268B Clamp Meter https://s.click.aliexpress.com/e/_opJ... VC480C+ MILLIOHM METER https://s.click.aliexpress.com/e/_onE... MESR-100 ESR METER https://s.click.aliexpress.com/e/_oom... XC6013L CAPACITOR METER https://s.click.aliexpress.com/e/_omn... FNB58 USB ANALYZER https://s.click.aliexpress.com/e/_c3h... 4KV Breakdown Tester https://s.click.aliexpress.com/e/_omK... LED Backlight Tester https://s.click.aliexpress.com/e/_oCR... NI-210SC Curve Tracer https://s.click.aliexpress.com/e/_o2e... NI210SJ (cheaper option but watch my review) https://s.click.aliexpress.com/e/_oD6... PCI POST ANALYZER https://s.click.aliexpress.com/e/_c44... FNIRSI 1014D SCOPE https://s.click.aliexpress.com/e/_c2x... NPS3010W 30V 10A PSU https://s.click.aliexpress.com/e/_oDu... Nice-Power Dual 120V 3A PSU https://s.click.aliexpress.com/e/_okG... HR1520 Pro Short Killer https://s.click.aliexpress.com/e/_c2R... KSGER T12 Soldering Station https://s.click.aliexpress.com/e/_omq... AIFEN-A9 PRO Soldering Station C115/C210/C245/C470 https://s.click.aliexpress.com/e/_ong... C470 Soldering Iron & Tips https://s.click.aliexpress.com/e/_opm... https://s.click.aliexpress.com/e/_oDV... QUICK 861DW https://s.click.aliexpress.com/e/_ooW... PROS'KIT SS-331H https://s.click.aliexpress.com/e/_omx... Sequre HT140 Hot Tweezers https://s.click.aliexpress.com/e/_opH... KADA 853B Preheater https://s.click.aliexpress.com/e/_opP... FNIRSI SWM-10 Spot Welder https://s.click.aliexpress.com/e/_ooZ... INFIRAY P2 PRO IR CAMERA + MACRO LENS https://s.click.aliexpress.com/e/_oot... TOOLTOP ET13S THERMAL CAMERA METER https://s.click.aliexpress.com/e/_c4M... ET13S MACRO LENS https://s.click.aliexpress.com/e/_ol9... Trinocular Microscope https://s.click.aliexpress.com/e/_okJ... TOMLOV TM4K AF FLEX https://s.click.aliexpress.com/e/_oBi... TL866 II+ PROGRAMMER https://s.click.aliexpress.com/e/_c32... NC-559-ASM FLUX https://s.click.aliexpress.com/e/_onM... DESOLDER BRAID (I use size 8045) https://s.click.aliexpress.com/e/_onh... HX-T100 SOLDER https://s.click.aliexpress.com/e/_o2D... ESD-11 TWEEZERS https://s.click.aliexpress.com/e/_om2... Learn Electronics Repair Discord   / discord   If you would like to support this channel You can send donations https://www.paypal.com/paypalme/youtu... You can subscribe to Patreon   / learnelectronicsrepair   Or you can click JOIN to become a channel member Thank you Richard