Car Boot Flea Market PC Finds 9th April 2023
ฝัง
- เผยแพร่เมื่อ 12 เม.ย. 2023
- Two Computers and a motherboard this week
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TEST METERS
Aneng AN8009
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BENCH PSU
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SOLDERING
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SS-331H Spare Parts
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THERMAL CAMERA
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EEPROM Programming
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CONSUMABLES
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DESOLDER BRAID (I use size 8045)
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Thank you
Richard
How do you find the power rails and know the voltage without a schematic? Is it labeled on the board but too small to see on camera?
The incoming voltages are easy to find and know what they should be (on something like an ATX motherboard at least). If you are not sure just google for 'ATX connector pinout'. The other derived voltage rails are more a matter of familiarity and knowing what voltages should be expected.
For example with a motherboard we would reasonably expect to at least have Vcore (voltage to the CPU) and Vram (voltage to the RAM). These voltages are normally generated by buck regulator circuits, often several phases in parallel which is called a VRM or voltage regulator module.
I spot these by looking for inductor coils and MOSFETs. The design of a VRM is basically always the same. I made several videos explaining these circuits but I never made a specific one about them so I'll add that to the list.
On other sorts of devices again it is down to a bit of detective work. Some experience helps, for example knowing the common voltages found in power amplifiers and audio circuits. Sometimes the voltages will be marked on the PCB, especially near to connectors, and other times you can work out what is a voltage rail and the expected voltage on it by the ratings on the electrolytic capacitors connected to it.
Another factor is that a lot of electronic devices use common voltage rails, and we should know what to expect, such as
380V - 420V (PFC circuit on 220V mains devices)
~100V to 140V (LED backlighting for TV)
+/- 90V (high power audio amplifiers from about 1KW upwards)
+/- 45V (power audio amps up to about 500W)
24V
19V (laptops)
15V (particularly audio mixers use +/- 15V)
12V
9V
5V, 3.3V, 1.8V (logic circuits - can work out correct voltage from component datasheets)
1.5V, 1.35V, 1.2V (RAM)
1.1V, 1.0V 0.9V CPU/GPU/PCH etc
So there is a no definitive answer to your question but keep on fixing stuff and with time you will find you become rather good at it.
Richard, You are the best. Im addicted to your videos, They are just what I needed. I got an AA in electrical years ago and I had the theory for most of this and repaired what I could on my own. I wasnt bad but not good either. This channel is just like sitting with an expert as he goes through repairs explaining what he is doing. Brilliant.
Just wanted to jump in and say keep saying "yaaa" as much as you want, I watched one of your videos where you got some comments about your filler words and sounds.
You are providing invaluable knowledge in a format that is helpful, at least you can do is have your freedom of expression on YOUR channel.
Never change gramps !
Thanks Richard for this video i have enjoyed it
love these boot sale videos :) with retro P.C's :)
Yeah I do like the retro PC - but sometimes I find other stuff worth buying too 🙂
At 2:09 I think is an ATX motherboard with dual power connectors that can accommodate AT or ATX style power supplies! They were popular when ATX launched but I am not sure how they still made them in the CDROM era. Thank you for the video Richard!
i've more than once moved an xp drive to another machine and it worked perfectly. windos 8 less so
Never discard "obsolete" motherboards, their value appreciates with time!
23:15 And it bleeps whoohoo 2 out of 2 🤣
These are starting to feel like the electronic’s equivalent to the ‘Antiques Roadshow’…
Haha and how popular is that 😅
Heya, yes love the car boot sale, "opening present's" see whats inside and testing mobo, replacing capacitor's/ram slot's etc etc just love it. got myself 2 pc's today from a second hand shop a keybord and some kabels the shop owner told me there is no HDD inside and for the rest I don't know is they work ?? that's gone be a lot of fun for me and the 1st pc's I'm gone film and upload to youtube
Time stamp 6:40 yeahhhhhhhhhhh it bleeps woohooooo I am happy now 😂
No ewaste recycling gig there on the island, Richard? Stash all the random boards and sell them to the recyclers, perhaps? Anything to avoid stuff going to landfill.
You may recall that Z77 was the flagship chipset of that generation. I'm still using one of those Gigabytes daily and it's working perfectly so no regrets there. I wouldn't worry too much about the RAM latch if you're keeping it. I think it's primarily for ejecting the module as there's lots of friction for retaining it.
Tip: When you encounter the 0x0000007b blue screen when booting off a drive with Windows installed from another computer it is the AHCI\IDE setting in the BIOS. A drive installed with the IDE setting will not work in a BIOS set to ACHI. Set to IDE and it should boot (and vice versa). There are still some chipsets\drivers that just don't transfer over to other computers but there are tools out there to remove driver information from an installed OS drive so when it is next installed it builds driver info from scratch and stops blue screens
estarts. This is more for xp onwards as earlier machines will not have the BIOS option.
for the booting issue,
it depends on the disk drive controller that are present on booting system. If the motherboards are similar (similar chipset) it will boot. It is also worth a try on older motherboard to put ide in the option in the bios under disk sata.
There are also ultilities, like paragon hard disk manager, that let's you inject the missing driver in an non booting os.
Thanks for the info 🙂
If the broken RAM retention clip is the only thing wrong with the Gigabyte Z77 board, that's actually a good deal. Ones with substantial problems will sell for almost as much!
I got it to boot windows 10. OK I didn't check everything but it looks good so far
Pre-Congrats on passing 100K subs so quickly! :) Looks like you'll be having a party on or just past the next video! 👍
Did I really ? it says 92.7K on my stats. I think 100K will be a little while yet
@@LearnElectronicsRepair Maybe I pushed the party a bit. Social-blade shows +1K every 10 days, so July you'll get your silver wall plaque. Stay humble and down to earth, they project > quarter million this time next year! 🤗
27:31 Yeah the new mouse driven ones are terrible for finding anything. The old ones were much easier, though figuring out what any setting meant was often interesting when it wasn't explained well in the text.
With XP you can just boot into safe mode and run sysprep and then the installation will boot fine
With Linux you can just boot and the system will run fine.
Hello Richard, I enjoy your videos enormously! I would like to ask you about some other project. Is that possible here?
with XP it depends on the chipset of the board if it will run or not when it has not been installed on that machine as it loads the chipset drivers first and if it are the wrong drivers it will crash so kinda a hit or miss kinda thing with XP
Bomba … Pump
My guess for the dual vga is going to be a mga g450.
Meh. Should've said g400. I have owned this one exact one from back in the day. I should've known better.
Dual-head, SGRAM G400, pretty much one level down from the range topping G400max. So pretty good for an agp retro machine of the year 2000. Even the 3d was just about competitive back in the day. This was the height of the matrox 3d game, and they gave up with their next generation.
Time stamp 16:45 .... will we get a 10 euro worth of bleep ?
@ time stamp 1:00 will it bleep ?? 😂 lets see if it will
Would Help Caps Lose Heat..!!
And gain inductance.
That "other" connector on the graphics card is bound to be matrox millenium.
Wrong! It's a mystique 220 ;)
And those 20+GBP cards have the rainbow runner daughterboard. The plain mystique is just a 10er.
@@luc_libv_verhaegen Thanks for the info
What is that test beeper, that kept indicating that there was something missing?
Richard does a vga to hdmi adapter not work ? they are pretty cheap
They are pretty cheap and I bought three but I have yet to find one (converter box not adapter cable) that works - at least with my HDMI capture card
Why do you sometimes put multiple RAM sticks in when testing a board? To me it seems like that makes the problem more complicated in a way, that all the RAM sticks have to be seated properly and working to boot up. Or am I missing something?
Nahh I'm just a bit masochistic on occasion 😉
Pentium 75
Ahhh, was i wrong by 25MHz?? Oh well. 386, 486 and then Pentium, those were my first computers. Played around with a 286 as well, trying to learn Fortran.
Aren't all PC's used for some sort of application LOL
Pentium 2
Yep