This Is How I Learned Electronics Repair

I think the best way to learn electronics repair is by fixing things. A great way to start, and the way that I did it, was by building electronic projects I found in books and magazines and fixing them when they didn't work. Usually because i had done something wrong! A good thing about this learing method is that you have schematics and often a description of the circuit operation. The fact is, if you cant' repair with schematics you ain't gonna learn to repair without them. Even now I love to play around with projects and still find problems that challenge me. Here is a good ecample - could you fix this one?

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I work in collaboration with:
The Electronics Channel (with Carlos and Detlef)

Gran Canaria Uncovered

Equipment used in my videos.
TEST METERS
Aneng AN8009
VC480C+
MESR-100 ESR METER
XC6013L CAPACITOR METER
FNB58 USB ANALYZER
PCI POST ANALYZER
TL460S Plus PCI_E ANALYZER
OSCILLOSCOPES
FNIRSI 1014D
FNIRSI DSO-TC3
FNIRSI DPOX180H
BENCH PSU
NPS3010W
SOLDERING
T12 Station with M8 9501 Handle
M8 9501 HANDLE
T12-BC3 Tip
SUGON T26D
QUICK 861DW
PROS'KIT SS-331H
SS-331H Spare Parts
THERMAL CAMERA
Infiray P2 Pro

EEPROM Programming
TL866 II+
CH341A
1.8V ADAPTER
CONSUMABLES
NC-559-ASM FLUX
DESOLDER BRAID (I use size 8045)
MECHANIC HX-T100 Solder 63:37 (I use 0.6mm)
ESD-11 TWEEZERS

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Thank you
Richard

[LearnElectronicsRepair]

*Keep the suggestions coming guys and we can try them all on a followup next week* 🙂

[kdog]

I too built electronic projects as a kid. I've recently been getting back into it by slowly accumulating my 'bench' gear and I've bought an Arduino kit to start messing about building stuff while dusting off my (very!) dusty coding skills.

[scroopynooperz]

Thank you for your efforts, sir Richard.

[Dutch-linux]

I learned electronics bij building Velleman kits and just by trying to repair things I did make the complete mixer they had in those days was a fun project

[samcgill]

Good to see someone else with a half melted breadboard!

[Manticore]

I've just built the LED flasher on breadboard & working as it should. My IC's are CD4047BD made by HLF. I did a diode check (with black lead on pin7). Like you, I got a reading (1.8v) on pin 10, BUT I also got the same reading on pin 11. So my working chips are showing a difference with your non-working ones.

[USA-GreedyMenOfNoIntegrity]

Let us newbs know whether to steer clear of AliX. Thanks for great information and training.

[Keepitreal]

You need more videos like this and use the scope to see what and how things

[choppergirl]

Surface mounted digital electronics soldered directly onto the PCB by robots turn most of us off.

I found I could skip the PCB manufacture by stabbing thumb tacks into box corrugated cardboard or soft wood, and then use the tops of the metal thumbtacks to solder point to point wiring too like the old school vacuum radio manufacturers did. Wild, and it works.

[tiggydorset]

I bought 3 amplifier Ic's in one hit from a seller on Aliexpress just recently. 2 chps had the numbers etched, and one had painted nubers (raised eyebrow). The painted chip was found to be a fake amongst the 2 good chips aftter comparing meter readings with a known good chip.

[mikecro]

Looks like you need to adjust and calibrate the trimmer capacitor in your scope probe to get that square wave flattened 😁

[Peter-rttu]

Without having looked into the datasheet of this chip: is it correct to have both ASTABLE and -ASTABLE pulled up to Vpp?

[Pixelwaster]

You could try the circuit at 3 or 5 volts. CMOS works from 3 ro 15 while TTL is 5 V. It might work on a lower voltage. The chips are late stage kitchen remodels -- counter fitted 😅😅 Juat look at the TI logo.

[aurthorthing]

I don't have an anti static mat bc I juat never got one and now I'm really poor.

[SW-ljso]

Try pulling out one of the mosfets, maybe the gate on’s are overlapping so both mosfets are on at the same time.

[tim]

I learned electronics as a kid in the way must people probably did in those days, by mucking around with stuff! There were also hobby magazines and one could find old radios and TV’s on the dump back then. My mum realised that electronics was probably going to be the future and bought me an electronics set for my 9th Birthday( Denshi block. Who remembers them!) and 4 decades later I’m still mucking about! (

[henkw]

Hello Richard it looks like the chips are fake or faulty. Ik presume that you tested alle of your available chips? An ic-tester could be an option, if you have one. Any scrapboards with a cd4047 on board? Testing without the LED's to check the wavevorm? Maybe the drawn current gives a clue. I am out of options. I will be watching for the solution. Best regards, Henk

[Foobar_The_Fat_Penguin]

You could try rubbing the chips with IPA or acetone. If they're repainted (which has been known to happen), the paint might come off. If nothing happens, you won't know if the chips are good. But if the paint comes off, you'll know that they're fake. And it's relatively easy to test.

[muddy]

Is that a polyester capacitor ? Higher losses than the ceramic in the example.

[jjqformerlyjailbreak]

Also pin rows 18-21 look rough. If those guys could talk they may say replace me. I think once a new batch come in everything will check out. Even on that screaming breadboard. Lol. Great video title.