How to diagnose faults methodically, no schematics. Another example HK Lucas Nano 600 stuck PROTECT

Рет қаралды 9,674

5 ай бұрын

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 2 is here • How to diagnose faults...
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Пікірлер: 29

@LearnElectronicsRepair 5 ай бұрын

Part 2 is here kzfaq.info/get/bejne/gLJ0fLB9ucjXkWw.html

@darrenbird2526 5 ай бұрын

Its Saturday morning here in Australia and believe me, theres nothing better than getting up, grabbing some corn flakes and sitting in front of the telly in your pyjamas, watching your favourite show. Yes i did have to kick the kids out!! Thanks Richard, cant wait for part 2 tomorrow morning!

@user-ws7ov3yy4i 3 ай бұрын

richard is life . saint richard. in which we trust.

@alexl5915 5 ай бұрын

Looking forward to part 2. thanks!

@martin87865 5 ай бұрын

Ho no !!! Its like an episode of Dick Barton special agent !!! what's next.??? Fantastic, loving it, can't wait to see what the problem is ???? If it turns out to be a dry joint I'm changing channel.

@grahambambrook313 5 ай бұрын

A bit before Richard's time, I think; and mine, I hasten to add!!

@cskeet1320 5 ай бұрын

Great to see you doing warts and all difficult repairs like this. Love it. The suspense is killing me though. See you tomorrow.

@GiC7 5 ай бұрын

Thanks, great lesson

@James_Bowie 5 ай бұрын

Impressive level of documentation for those NXP audio amps.

@davidmonk7773 5 ай бұрын

I've repaired a few of these things now, mostly dry joints on the transformer

@nasosst3092 5 ай бұрын

Sometimes, watching your audio repair videos, I'd like to be there with you to save you some time Rick. Since the beginning I knew these red and blue wires are the Amp outputs.😂 HK is a serious audio components producer but the soldering of the first Amp chip made think that they have to do more about their quality control. I suggest you check Diag1 also and see if a temp sensing component exists and is bogged. Thanks again for your videos...

@LearnElectronicsRepair 5 ай бұрын

All coming in part 2 - it's already recorded...

@jimjamm9318 3 ай бұрын

He not trying to be fast, he’s teaching a methodical approach

@nasosst3092 3 ай бұрын

@@jimjamm9318 IMHO it's the starting point for an Amp repair to pinpoint the outputs

@Dutch_off_grid_homesteading 4 ай бұрын

Heya, very nice explanation how to trouble shoot something like this

@amilcarrodrigues3846 Ай бұрын

Is there any disassembly guide online?

@Iceking007 10 күн бұрын

Do you find it more useful using a 100W light bulb or a 60W lightbulb? Or do you use both?

@revivalmaster 5 ай бұрын

The scope timebase was set to 5 ns should be in ms range. Look forward to part 2

@mohammadkhlaifat1651 5 ай бұрын

i wonder what is the work of ceramic capacitor between hot and cold parts

@lasa6619 4 ай бұрын

Could you please tell which speaker brand has been factory installed inside the subwoofer unit of HK audio Lucas nano 600 ????????? Is it a brand called CELESTION T591 3A ?????? Please reply

@Onkel.Moetrik 5 ай бұрын

Hello below there About your test leads.. I am really curious to know, why you use test leads that have such a long unprotected tip. To me it looks like an accident waiting to happen. It seems very easy they could short circuit if one tip slips, or if you accidentally touch a heatsink or something similar. On the screen it looks like you have something like a 30 mm unprotected tip.. For general probing I don't understand it. I know it is good if you have to get down in a dupont connector or similar pcb connectors, but probing on high voltage I don't get it...

@LearnElectronicsRepair 5 ай бұрын

I just like them, they are resilient and very sharp, great for probing in tight places such as pins on SOIC IC as they actually stick into the solder. I have commented about them not being suitable for high voltage before. I wasn't using them on the mains side of the PCB in tis video, but I have been known too - often saying I shouldn't do this at the same time as doing it

@johnfitzpatrick2469 5 ай бұрын

I have submitted my answers in lightrunners comments, sorry. 🌏🇦🇺

@robtitheridge9708 5 ай бұрын

I hate jobs like this so good luck.

@Lightrunner. 5 ай бұрын

Hi Richard 🤗🤗🤗🤗🤗 You forgott to pull up with max 5V the diag pin 1(TFB) or 2(all other protections states) . You cant meassure anything because they are open drain outputs . In the datasheet they say pull up with 10k and max 5V. At the pcb its look like the trace going nowhere😱😱

@LearnElectronicsRepair 5 ай бұрын

All will be revealed in part two.... tomorrow 😉

@Lightrunner. 5 ай бұрын

@@LearnElectronicsRepair tomorrow 😳😳😭😭🤣🤣

@johnfitzpatrick2469 5 ай бұрын

G,day Richard from Sydney Australia. So my learning outcomes, Diagnostic testing of PCBs * Introduction AC via filiment light globe (instant illumination indicated no short circuit). * General visual inspection for integrity of traces, soldering and burn marks to electronics. * Use multi meter needle probes to establish 'expected' DC at power rails on board. * Repair soldering (question size of iron tip flat v point). Thank you looking forward to part 2. * I would like to know is the benefit in using an AC voltage control in introducing low v after repair, then slowly increase (240v)? 🌏🇦🇺

@Lightrunner. 5 ай бұрын

@@johnfitzpatrick2469 hi, you can cut off your answer gere and copy it to the right place. After copy you can delete it here. (Push the three points at your answer).