Learn Electronics Repair #33 - Online Resources. Where to find Schematic Diagrams & Repair Advice

[@Hellhound604]

Honestly, I miss the old days where even simple radios had their schematics glued inside the pack-panel, and those huge maintenance manuals from the like of HP, Tektronix, Sony, etc… even though they sometimes remarked common chips with their own in-house part numbers.

[@Speedracer415]

Just like appliances still do. That's right well said

[@johnh10000]

Teardown a Us expression, usually meaning to take something apart carefully, re-assemble able !! Just a thought Richard, next time you create a list of useful sites, put the links in the description.

[@clintonscholtz8182]

Worked 100% Thanks, you saved me big time on this find...

[@SlayElsair]

Auto subscribe. Another channel with quality content, no BS.

[@ashleypapper369]

Also Richard keep up up the good work👍thank you keep on smiling😃

[@tuanlongpc9376]

I am Vietnamese. this is great, thank you very much.

[@LearnElectronicsRepair]

Welcome!

[@manISnoGOD]

Richard thanks buddy 100% helpfull info

[@andrelnp]

Thansk Bro, that God blesses you 🙏

[@patkelley8293]

After watching I went an found schematics for my Commadore 64 and Plus/4's I'm going to be working on. Power supply all that Thank You Captain Obvious! 😃

[@Patrick-pl8wv]

Thank you so much for sharing this information with us!

[@jellyheed]

Hello Richard, I thought I recognised the voice. I'm met you at radio rallies in the past and I brought my first pc off you about 30 years ago. A DX2-66! I'm after repairing a blown component on a Formuler Z8 box but I do k ow what components I need and what they are. How do I go about this? I can't find schematic for it.

[@charlessmyth]

I've had good luck with finding schematics for things like Akai and Revox tape machines and MCI mixing consoles.

[@Xorat]

Thanks for the information Richard, exspecially the last paid one seems interesting. As you said, even if you can repair a single thing from that you got your money worth out from it.

[@LearnElectronicsRepair]

Yes, exactly. If you want some schematic for a repair then I find it best to join for one month and grab as much else that you can while you are at it :-)

[@esteban19h08m]

Thank you sir, this helps me from obsolete or old inverter coolers, and everything else i believe, very grateful Do you know where i can find service manuals for old boards that are not for sale or are hard to find besides google and this video? thank you so much

[@davestake44]

Thanks for the great videos they help a lot.

[@ElchicodeJalisco]

All good information but I couldn't find my schematic on any of the places suggested 😢, maybe you can point me in the right direction. I am trying to repair my garage door opener (odyssey 1000) circuit board (GENIE 38001), found a blown fuse, but would like the schematic

[@oomgmgoo8262]

Thanks a lot for your information .

[@EFazy]

Hy! Elektrotanya is a Hungarian website, but you was close ;)

[@richardvokes3562]

Hi there. I've been following your channel for some time now. I'm in a pickle at the moment. I have a MA400 Amplifier that was seriously blown and several components show no values. Would you have such a schematic in your arsenal? Thanks for all the good tips I've picked up from you 😀

[@michaellitvinov7272]

Hello. I am watching your channel and I learning from you Electronics repair. Its very like your videos. Thank you. I have a motherboard LENOVO Ideacentre a310 which has some problem. I would like to repair it but I can't find a board view file. Could you help me to find it. Thank you.

[@Jason-zh7wo]

Great, thanks for the info 😃😃👍👍

[@2diallmadi156]

Thank you sir 👍✌

[@badgerfool1980]

Excellent vid, useful resources, sadly still no schematics for the B450 AORUS ELITE (rev. 1.x) I picked up at the car boot, seems there's a short on the 12v :/

[@surajitchowdhury6013]

I'm in need for controller board schematic/ circuit diagram for Veriti 96 well thermocycler (PCR) machine by Thermo Fisher. I tried by the method you've mentioned but nothing could be found. Where/ how can I get it ??

[@Dutch_off_grid_homesteading]

Heya wen you have a schemitic it makes it a lot easier

[@שרותמאיר]

hi richard and alll friends do you know any forum about board appliance repair such as washing machines fridge and hvac?

[@cuneytackgoz7363]

Thank u richard ,maybe u can upload your arcive ?

[@davidmaruska1641]

Thanks for the information, I have bookmarked a couple of the sites. But they did not have what I was/am looking form I any places for strictly audio. I have a bass Euro B1800D-Pro. Thanks for the great information again, I'm just getting back into doing some repair after 30 years. Have you posted the current voltage box with light in line? So don't quite remember the name/term for it.

[@LearnElectronicsRepair]

Ask on badcaps.net forum in the audio repair section. Also try here, I believe they have something very similar to the one youwant music-electronics-forum.com/forum/schematic-requests

[@boblevey]

Do you still have educational videos on another format?

[@chol5808]

Is there a boarview program that will run on an android tablet?

[@simonszabo4013]

Elektrotanya, (13:45), this is a Hungarian website

[@smartips1036]

Hi Richard, thanks for another video. I have learned a lot thanks to you in these few weeks. I have an unrelated question about short circuit detection. I understand that sometimes you apply power to see which component is shorted and gets hot. I have a broken phone and I think there is a short circuit but I don't know where. On my power supply, I set up the voltage to 4.2 volts and current to 2 amps (to make this adjustment I have to connect both leads from the power supply). I connect the wires to the phone as if the battery was plugged but as soon as I do it, the amps go to 2 however the voltage drops to 0. I am not sure if the electrons actually flow. Will the shorted component get hot when the voltage is 0?

[@LearnElectronicsRepair]

Hi Pawel - nice question! OK, we need to consider ohms law to work out why the short circuit component sometimes gets hot, and will it get hot in your case. So in your case when you apply 2A from your constant current power supply, the voltage goes to 0.1V. So ohms law tells us that the resistance of the short circuit R=V/I. For ohms law calculations, R is in ohms, V is in Volts and I is in Amps On your phone V is 0.1V and I (current) is 2A. Therefore the resistance of your short is : 0.1 / 2 = 0.05 ohms Now lets consider the wattage (heat) dissipated by the shorted component. W = V x I so in your case 0.1 x 2 = 0.2Watts. Which is not a lot. For a very small capacitor which is short circuit, this may be enough to get the component warm, but due to the fact is it soldered to the board which acts as a heatsink, the chances are you will not be able to feel anything warming up. The problem with finding shorts by using current to get the faulty component hot, is that it does not work if the faulty component is actually zero ohms. If that was the case the 0.05 ohms would be the resistance of the circuit board tracks, which means they would get a bit warm, not the faulty part! It's also not so good for finding shorts on large components as they would have to dissipate quiet a few watts to warm up at all. The method of using a bench PSU to inject current works much better when the 'short' actually reads a few ohms. For example, if you set your PSU to 2A, and the voltage was dropping to 4V, then the 'short' resistance would be R=V/I so R=4/2 = 2 ohms. Now the Wattage W=VxI = 4x2 = 8Watts! In this case something is going to get very hot indeed. Also the resistance of the circuit board tracks is now much less than the 'short' so almost all the heat is dissipated by the faulty component, and almost none by the circuit track. Check out this video on short circuit finding. kzbin.info/www/bejne/oXiwXo2jp9dpqsU This explains why on the 8800GT graphics card I could not find the short by injecting current. In my case I could not get enough current (only approx 0.5A) to flow at the correct supply voltage (approx 1.2V) to heat anything up. Once again, W=V/I, I so I had 1.2/0.5 = 0.6 Watts. Not enough. There are three ways around this, that I can think of. Increase the current to the maximum your PSU can deliver - 5A, 10A? This could help but could also burn out thin circuit board tracks if you really use too much current. I would certainly go up to 5A and consider that safe enough. This would also cause your PSU to give more voltage, so the formula W=VxI means the wattage would go up rapidly as you increase current. This still would not work if the short circuit component is actually zero ohms, as no voltage would be dropped across the component therefore watts = 0 x Current which of course = zero, no matter how much current is flowing. instead the wattage (heat) would all be dissipated by your test leads and circuit board tracks as they have more resistance than the faulty part.. On low voltage power rails like my GPU (1.2V) you could also try to increase the supply voltage to get more amps to flow into the short, once you have connected to the faulty device - this would work by increasing the current and therefore the wattage, but it is somewhat dangerous to the device because if the short circuit suddenly burns out / goes open circuit your PSU would jump up to the full voltage you set - which is too much for that power rail and would damage other components You could also try the method I used in the video, with a multi-meter on milli-volts or even micro-volts range. This would also work better with higher current. The only other way I can think of is to buy a meter that can measure resistances extremely accurately - say to a resolution of 0.000001 ohm - then try to trace the short with the device powered off. I hope that slightly lengthy reply helps you trace your fault. Richard.

[@smartips1036]

Thank you, Richard, I appreciate your explanation, I think I understand this better. When I saw the voltage dropping to 0 when injecting the power I thought that this is some kind of safety mechanism on the power supply in case of a short circuit. But yes, when I increased the amperage the voltage increased as well. I basically try to fix an old iPhone and hence the question. It was water damaged and I think there is a short somewhere. I have checked it with a multimeter in diode mode and it read zero. I cleaned the logic board in IPA and for some reason, the short (when checking with the multimeter) disappeared. In diode mode, now it shows a 0.5 V voltage drop. I'm not sure if I'm right but I think that when the phone is switched off and I inject the power, it should not take it and the amps should be 0. But it takes 2 amps so I presume there is still a short circuit even though the multimeter shows there is not. Also, I think that a working iPhone takes normally around 1amp. Does it all make sense Richard?

[@LearnElectronicsRepair]

@@smartips1036 Quote 'When I saw the voltage dropping to 0 when injecting the power I thought that this is some kind of safety mechanism on the power supply in case of a short circuit. But yes, when I increased the amperage the voltage increased as well' - Yes Pawel that is Ohms law at work in real life! You are getting there my friend :) I = V/R. As R (resistance) of the short stays the same then if you increase I, then V must also increase to make the equation remain true. Also W = V x I If you double I then you also double V (which ohms law says must happen when R stays the same).... so W (heat) increases by 4 times. I said I was not going to teach electronics mathematics because it is not needed when repairing a circuit - but ohms law is crucial and you must understand this one equation (or at least appreciate it's effects in real life repairs) which is why I will continue to explain it every time it is needed to understand a fault. Get ohms law into your understanding and a great deal more becomes clear.,

[@MrEgypticon]

Thank you so much

[@ahsamahi4385]

The only schematics available online are for laptops or mobile phones or ipads or motherboards which is not enough

[@ashleypapper369]

Hi Richard I'm in the process of registering at badcaps forum and it's asking what username referred me to the forum so can you let me know what username to put in pleases

[@nikeal1856]

Hi mate Do you know any good web for Car’s and buses 🚌 🚗 electrical schematics and ??

[@boy230710]

hello and thankyou for the top video i was wondering if you possible have the schematics or boardviews for asus maximus viii hero and also msi meg z390 ace motherboards thankyou.

[@LearnElectronicsRepair]

Have a look on LER Discord server Learn Electronics Repair is now on Discord! Come and join the fun, it's free. discord.gg/vam6YC8vwU

[@DarrenHughes-Hybrid]

I used to know everything, but I forgot most of it! LOL

[@blemwila1064]

hi, do Xbox 360 consoles have board view files ?as I only find schematics

[@hassanismail5659]

Thanks for you.. Can you help me to find schematics to solar inverter 3kva mppt.. Please?? M c

[@nezloklaszlo3447]

Elektrotanya is a hungarian website. I know because its my home language.

[@muhammadakramtahir9914]

I need service manual for Sharp GX 250 stereo component system. Pleaae help some one.

[@Speedracer415]

Google does not bring me their. Always looping me down rabbit holes or fake or un reliable sites

[@Swenser]

How do all the apple schematics get leaked? They can protect iCloud until the cows come home but the lady with the key to the schematics cabinet must be on acid.

[@101markharris]

boardview ?

[@justinbenmuampa4562]

How to get gerber files for motherboard ? Siteweb freee

[@jasondoesthings919]

Fantastic channel and will be recommending you in the future

[@LearnElectronicsRepair]

Hi Jason, thanks for the commendation. I also subscribed your channel and will check it out.

[@jasondoesthings919]

@@LearnElectronicsRepair wow thank you. You happened to pop up in my feed and I was like where has this channel been. KZbin is harsh to smaller channels. There are so many useful channels like yours that nobody sees, it is a disservice to people who want to learn how things are properly done. Thank you for sharing your knowledge.

[@LearnElectronicsRepair]

@@jasondoesthings919 Yeah, this channel is just over four months old so I guess it takes a while to get noticed. Only thing to do is keep trying :)

[@ch.wey.4406]

Badcaps don´t accept new members for a while. I tried it with 3 different emails ... no chance