Відео

Don't change a thing it's great that you are willing to go into the nitti gritty and explain your process and explain how the curcit works thanks for being part of the process Big thanks.

That is why it is important to know the Ohm's law !!!!

Thanks

no one with adhd will understand this teaching method 🫣✌🏻

"I hope you enjoyed that 'short' video" . Nice. Great idea. One of my mentors told me "An engineer is someone that can solve a problem for sixpence, that any idiot can do for a pound".

1:39:36 - I’ve removed “Ty-Wraps” from the inside of equipment from as far back as the 80’s; but, I cut them at the entrance of the head instead of cutting off the top like you just did. That way, I could reuse the strap on a smaller bundle of wire.

The allen key star is called a Torx. Another great vid cheers.

1:39:36 - I’ve removed “Ty-Wraps” from equipment from as far back as the 80’s.

Love the way you are always trying to improve knowledge of technique / tools (for everyone). Thanks :-)

Lots of protein in that one computer case. ;)

The reason you had different "Diode Drop" measurements is because some of the pins to the Op-amps are shorted together on the traces (inverting to output).. I doubt those ICs are the source of this failure. I would look carefully in the areas where someone else was working (left the flux on the board). I see they used that brown glue to hold some components from moving around. At 2:07, you can see it is being used on the resistor inside the coil. The problem with that glue is after it is exposed to heat it become dark brown, brittle, conductive, and corrosive. It will eat traces, component legs, and solder connections.

How weird! I ordered that exact de-solder tool from Radio Spares yesterday and it arrived today. It obviously had the RS branding on it but other than that, it is exactly the same.

Use the Mr Solder fix technique. Take some solid copper wire and bend it to fit the legs of the device being removed. Flood it and it simply drops out. Also those super wide tips are available. I didn't have the station required but i bodged it into an old soldering iron handle and wired it up to a bench supply. Also works a treat.

I bought 3 amp chips from a seller for a repair job (1 for the job, 2 for stock). In the same package were the 3 chips, but one was different. The etching/writing was not quite the same as the other 2. It turns out this chip was fake when the other 2 were good (I compared meter readings which were different from each other); same package from the same seller. Its safe to assume that these chips are faked, so be wary.

Pulling the mb out of the “mold” …

I wish I knew what you forgot. I thought I was good at diagnosis, but you show me I know NOTHING.. Thank you.

can this device be made to output an rf signal that is finely tunable in increments of a maximum 1 microvolts and that it goes as low as 1 microvolt rf output ??? It would be ideal to align FM radios where very often you'll need to inject an RF signal of between 1 to 30 microvolts ???

@learnelectronicsrepair hey Richard. I have a load of ic’s, op amps, 555 timers, Schmidt triggers, hex fets that sort of thing I bought as a job lot. I could send you over a list of what I have and if any of them are any good to you I don’t mind saving them until your back in Blighty next and send them to you. All original new old stock so should be reliable and I won’t want a lot for them either 😊

I’m going to build a solder vacuum using various parts from solder suckers, a water cooler, etc. I have all the parts, just need to build it.

Hi Richard 🤗 Your solder skils are getting better and better 👍👍 The JRC insn't new,, there are a very old electronic company 🤣🤣. I miss your oscilloscope for this repair😭

Well done Rick. When you started writing the voltages on the schematic I was fooled to think that the lowside mosfet was somehow shorted. It seems that experience and perseverance always wins over clever newbies like me. On the other hand the owner reminds me of hundreds of other dudes of the same kind that I met year after year installing audio and lighting systems. They never change.

D35 looks iffy

Lots of valuable tips for beginners re the vacuum tool, Richard.👍👍👍 next time you should include a section about dismantling the tube/spring assembly and cleaning the whole assembly and show the dirty filters after a time… (btw, those white IKEA pads without glue, that you put under the legs of chairs works well as filters if you trim them a bit)

Have you seen solder sucker irons? e.g. YIHUA 929D-V Electric Vacuum Desoldering Iron £15

Did the welder work when this PCB returned to Ireland? As for basic MIG welder operation. The MIG torch has a trigger, once pressed this will open the circuit, turn on the gas solenoid (preferably a split second or so before) firing up the wire feed motor (I think these are normally 24V DC). MIG welding is typically adjusted on a rotary dial (modern inverter ones at least) with a voltage range of circa 13V-30V (smaller machines will top out around 24-25V) and then another dial will adjust the wire feed speed/amps (directly related). Amps will typically be, maybe as low as 50 at the minimum, never really looked, up to 300-350amps. Maybe more for a monster machine. Most smaller single phase machines top out at 150-180 amps on a 10A supply, 180-200 amps on a 15A supply. We have a couple of 250A machines at work on 15A supplies but they are never high, typically need a 25A+ supply to run flat out.

When probing the op amp pins there were differences in the input pins(32:10). There were clearly units which were visibly wired as unity gain buffers and there the inverting inputs are connected to outputs. That explains the different behaviour of the pins.

Were in the uk are you based? Also were can i get tester to test gpu?

A good way to start the day by watching LER thanks Richard

Thanks

Is it still the INFIRAY-P2-Pro you prefer to use? Does it work good after this time?

6:15 pm Wednesday night in Tasmania Australia and I'm spoilt with a LER Video to be able to sit here and eat my Steak eggs and chips, watching my favourite show! Thanks Rich!

Yes, brilliant. This is a refresher for me and a good thing.

I hope you did not pay much for this

It seems that just below the ICS chip a capacitor C5 is missing next to C33, close to where you cleaned one of the pathways. At minute 14:30 or 19:10 of the video you can see it better.

Found on the beach?

Heya, and a 3D frontpanel printing could be an option too

SIS board. You didn’t check the back

Awesome work on explaining that. I was even able to follow you, not understand everything, but at least follow. I am sure the depth you go into explaining something is annoying to some, but for someone like me it's essential and assists so much more than you imagine. Keep them coming!!

the dell board may not actually be lost yet check the psu pinout of the dell psu against yours dell had machines for a while where the psus looked like normal atx but they had a different pinout also the at style connector was 3v only on those dell psus your psu has a p4 aux which is 3v and 5v

That seems to be one green PC out of the woods.😅

That series of DELL uses the same connector for the PSU, but has a different pinout! Only the DELL PSU will work with it, or you have to modify the connector cabling of one of your test supply to be used with a DELL. I made the same mistake trying to use a DELL PSU for another normal motherboard, but luckily it just shorts out and go to failsafe mode without destroying the MB or PSU. As another one below noted, it looks like the same DDR buffer IC was used in the DELL? Brings back memories - had one of these as my work PC around year 2000🙂

Heya oh wouw that 1 is durty straid to the scrap

Washing Machine

Richard.. Do you want to breed Bugs??? Wonderful new home Bug cases🕷🪳🦂🦟🪰

you had my subscription as I heard you say that this is skill is something that wont go away! 🤍

Im sure you've heard it before but you should get a knoppix cd. That way tou can test all parts of the board even if windows is corrupt

Ddr buffer on the dell board?

"Bin.", one day…!

I think you may need to find a new source of PCs. Your guy has run out of good stuff. So it is time to move on. Maybe there's a recycle center on the island? I would definitely be looking for a new supply.

@LearnElectronicsRepair any simple way to reuse semi retired laptop batteries for alternative light powering as they would be way better but no longer have charging dock. I now have two sitting around gathering dust and I have too many LED mini lights chewing thru AAA batteries.