DAS18A 750W Class D Amplifier Repair: This Did Not Totally Go To Plan!
Vložit
- čas přidán 23. 05. 2024
- I have three DAS18A Class D Amplifiers to repair. This did not go totally to plan, I should have realised because this is Learn Electronics Repair video number 666. Wanna find out what happened? You just gotta press PLAY
I work in collaboration with:
The Electronics Channel (live streams 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)
For All Your PCB needs: free $5 discount coupon
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.
TEST METERS
Aneng AN8009
s.click.aliexpress.com/e/_DdW...
amzn.to/469ZgOS
www.banggood.com/custlink/mD3...
KM601
s.click.aliexpress.com/e/_DBw...
www.banggood.com/custlink/KD3...
VC480C+
s.click.aliexpress.com/e/_DEY...
amzn.to/3Q3LEz7
amzn.to/46tmNdo
MESR-100 ESR METER
amzn.to/3tiy8hK
amzn.to/3RwvejK
s.click.aliexpress.com/e/_Dmi...
XC6013L CAPACITOR METER
s.click.aliexpress.com/e/_DmX...
amzn.to/3t71Nul
amzn.to/3LDdcbO
TM-902C TEMPERATURE METER
s.click.aliexpress.com/e/_Dm9...
amzn.to/3LFzERv
amzn.to/3PTwuvW
LCR-T4 LOW COST COMPONENT ANALYZER
s.click.aliexpress.com/e/_Dmq...
www.banggood.com/custlink/KKK...
amzn.to/46uzV1R
amzn.to/3RHsmAN
FNB58 USB ANALYZER
s.click.aliexpress.com/e/_Dmd...
amzn.to/3tb1QW8
amzn.to/46oMn30
www.banggood.com/custlink/mKm...
PCI POST ANALYZER
s.click.aliexpress.com/e/_DBs...
amzn.to/46m9Gep
TL460S Plus PCI_E ANALYZER
s.click.aliexpress.com/e/_DnB...
amzn.to/3ZERvOs
TOOLTOP ET829 SCOPE METER
s.click.aliexpress.com/e/_DBw...
www.banggood.com/custlink/KGv...
MULTIMETER PROBE KIT KET05
s.click.aliexpress.com/e/_DE7...
OSCILLOSCOPES
FNIRSI 1014D
s.click.aliexpress.com/e/_DEz...
amzn.to/3RxMFk1
www.banggood.com/custlink/KKG...
FNIRSI DSO-TC3
s.click.aliexpress.com/e/_DC8...
amzn.to/3RBsgdS
www.banggood.com/custlink/Gm3...
FNIRSI DPOX180H
s.click.aliexpress.com/e/_DBX...
amzn.to/468oooT
www.banggood.com/custlink/GGG...
BENCH PSU
NPS3010W
s.click.aliexpress.com/e/_DDP...
amzn.to/3rxsuIf
www.banggood.com/custlink/3DD...
SOLDERING
T12 Station with M8 9501 Handle
s.click.aliexpress.com/e/_DFV...
amzn.to/3FdG8Ul
M8 9501 HANDLE
s.click.aliexpress.com/e/_De0...
T12-BC3 Tip
s.click.aliexpress.com/e/_DeN...
amzn.to/3EUFpqQ
amzn.to/3PB8axw
SUGON T26D
s.click.aliexpress.com/e/_DFx...
QUICK 861DW
s.click.aliexpress.com/e/_DDo...
amzn.to/3PBOKZH
amzn.to/3RCSqNh
PROS'KIT SS-331H
s.click.aliexpress.com/e/_DDo...
SS-331H Spare Parts
www.aliexpress.com/item/40002...
THERMAL CAMERA
Infiray P2 Pro
s.click.aliexpress.com/e/_Dmu...
amzn.to/457PgEb
www.banggood.com/custlink/DDG...
MICROSCOPES
Amscope Optical Microscope (copy)
s.click.aliexpress.com/e/_Dlh...
uk.banggood.com/custlink/mKGy...
amzn.to/4675Qp0
amzn.to/459uvrY
ANDONSTAR AD407
s.click.aliexpress.com/e/_Dl4...
amzn.to/3PSQKxJ
amzn.to/48sxej4
EEPROM Programming
TL866 II+
s.click.aliexpress.com/e/_Dls...
amzn.to/3RTCRB9
amzn.to/3LDu3Lu
CONSUMABLES
NC-559-ASM FLUX
s.click.aliexpress.com/e/_Dda...
DESOLDER BRAID (I use size 8045)
s.click.aliexpress.com/e/_Dl5...
s.click.aliexpress.com/e/_DFJ...
MECHANIC HX-T100 Solder 63:37 (I use 0.6mm)
s.click.aliexpress.com/e/_DeZ...
ESD-11 TWEEZERS
s.click.aliexpress.com/e/_DCZ...
amzn.to/3PVfO7e
Learn Electronics Repair is now on Discord! / discord
If you would like to support this channel
You can send donations
www.paypal.com/paypalme/youtu...
You can subscribe to Patreon
/ learnelectronicsrepair
You can click Join to become a channel member
Thank you
Richard
*Part two recorded and coming tomorrow* 😉
Hi Richard, just a big thumbs-up from me on your very methodical walkthrough on your style of fault-finding and diagnosis. For an old hand like me, I find your videos highly therapeutic, and every now and then I still learn new trick from you. As somebody that also educated beginners, I view your approach so calm and educational for a beginner, walking them step-by-step through your thought process…. Wish more of those electronics you-tubers would follow your process. Every decision you make is rational and well thought out. Ok, ok, there are sometimes that I would have followed a different approach, but hey, uor brains are different after all…. For example, I use an oscilloscope a lot more, even for measuring supply-rails. With modern scopes, you can measure voltage accurately enough and see potential problems (ripple, oscillations) with one measurement, but that is not a criticism, just showing a different approach. Showing people how to look at new thing, deduce how it works, drawing rough schematics to figure out how it SHOULD work, instead of just guessing blindly is a huge skill that beginners should get acquainted to, and I think you are an exemplary example of educating people how to do methodotical fault-finding.👍👍👍
BTW. I think you need to get some high-power 8-ohm resistors to test the amps with, instead of a speaker 😄
Agreed, we all have different approaches, heck I even may take a different approach myself on any given day. Yeah I talk about dummy loads in part two, coming tomorrow
I saw some smoke as well at around 36:00.
36:20 some smoke on the right side there
Wow. You really have sharp eyes there! I had to watch it a couple of times before I saw it. When the unit is switched on for the second time without the current limit, there's a whisp of smoke that can be seen between the 2 video inserts on the right hand side.
That's where a couple TO-92's are. One of them was bent over at the time, was originally straight up and down.
@@pault6533 All will be clear in part two which is now recorded ready for tomorrow 🙂
Heya, I have good eye side but had to look twice to see it well done 👍
okay, let's continue with this repair... This type of amplifier that is mounted in the back of many brands of subwoofers,.... probably has similar techniques for diagnosing the problem, I would suspect that on average a common repair has to do with the output stages... From being overdriven but that's just speculation on me... But because this is a learning channel going through the process of diagnosing and explaining the circuitry is going to be a great learning experience and if we get the opportunity to repair all three who knows what we can learn.
Jeez Richard, I think I jumped more than you!! LOL
...same here!!
33:55 Richard goes off camera to change his undies 😂 Make that one into an ElectoBoom style short Richard
Smoke when you took it off the current limiter at 34:30 - just above the inset image of the bulb
Very interesting video Mr. Richard thanks!
29:39 - Wow! I just learned a new English term - _Preexploded_
Heya, I only saw the smoke after reading the comment and still had to look twice to see it. love to see these kinds of repair. curios how that repaired speaker is gone sound like. what time the upload will be plus/minus.
Class D amplifier repair is more important than ever!
Loving the suspense!
Nice Jump Scare...
❤
These plate amps are a pain and have floating grounds. Sometimes primary and secondary ground. Plus no discharge resistors. Also, I dont think that amp is class d. Those old style, linear power supply amps are pretty straight forward.
Looks very much like a Class D to me
Master
Can I send you my electronics to be repaired? It's a 2024 Lexus LM350H headunit.