I could see more dodgy solder joints in the video, and the lose resistor don´t seem on completely in the end so I would had scraped the legs before soldering it back first. I wish you would had taken a closer look at the two other power resistors you see have burned the pcb around them since they very likely have bad solder too but I could not get a good view of them. I think the PSU was dead because something is still lose in it and tapping it temporarily fixed it
🥳🥳🥳 Yeahh back to the eighties 🥳🥳🥳 Thx Richard 👍👍👍 . Old AT power supplies are indestructible✨️✨️. If you can fix the old hardrive a dream and wonder come true 🤩🤩🤩🤩
Thank you for that nice video! Sure it's worth to try to get the mfm hdd running! 😊 My opinion is that the entire machine is worth something. There are some people who can use that pc with DOS or even unix. There are some nerds outside who appreciate this old robust technics. Some years ago I made my own custom router from an old pentium1, with 6 LAN cards, programmed under Linux. It ran for years day and night without any problems, till I met my wife and my life changed. This is good old stuff worth to keep it alive. I'm very sad that I don't have my first pc anymore. A fire destroyed the storage place. But I still have my first 486, and I will take it out soon to reactivate it again. It's just a matter of time, with a family with two kids. But I'm sure I can give my sons lessons with that. Of course with DOS. No one needs Windows. I remember I was the only one in my class who knew DOS, and everyone went to me asking me for help when Windows didn't work... 🤣🤣🤣
Coincidentally, I was at a friend's house this afternoon checking the contents of some old IDE drives. The last one was from an old 286, one of the early WD IDE drives. It would spin up but wasn't recognised. As for the old Tulip pc itself, the PSU was dead. It is going for salvage with any profits going to charity so I didn't bother investigating further.
Thanks for this video I have a few old power supplies I need to fix. Can you tell me what Band/Model camera you use for over the bench. I like that it zooms in so clearly. Thank you
I would have cleaned the leads of that power resistor before resoldering it. There appeared to be some corrosion or other substance on one of the leads that stopped it from taking the solder.
There's only three rules to soldering, clean, clean, clean! It seems like just one rule but you have to clean a few different things. The tip of your soldering iron, your solder and the stuff you're soldering all has to be clean. Contamination is the leading cause of solder failure.
I'd tap the HDD with a rubber handled screwdriver on the side while plugged in, or another thing I used to do was spin it in your hand like trying to open a door handle quickly, sometimes stops the "stiction" not that I can spell it lol and I've tapped them with my palm on one side corner... had a few RLL drives (one a massive 8Mb full height 5.1/4) get stuck as well as MFM's and then some ticked like a clock with a metallic springing back - bad reads NBG after doing it too much haha
Or maybe the solder joint at the resistor is still a little bit dodgy and you moving the PSU around caused it to make contact again? That aside: You may want to take a quick peek into the metal can at the mains input connector. There's probably a filter in there and that *may* have a RIFA cap, which are infamous for spontaneously releasing magic smoke of a particularly foul smelling variety.
The interesting part is that a vintage PSU has still good enough caps to run. You take a newer PSU and is already dead with dry caps ;). We all "love" modern electronics :D when they fail so easily. But, hey, Sony keeps up really well I'd say.
some times the stepper motor can get stuck, if you can get to the stepper motor bearring a couple of drops of sewing machine oil in to the bearing could free it, did'nt hear the hard drive spin up try giving a tap when booting up.
Good fix on that classic Delta supply. Delta is the big mamma jamma in PSUs. You think you're buying this, that or the other PSU but you're really buying a Delta half the time. Their house brand stuff is solid too. You should get all that old glue out of that PSU. It looks like it's gone funny to me. Not funny ha ha either. Old glue going conductive is a common failure.
IMHO it's always worth try to fix old AT power suppliesI had to fix some. Also a SONY PSU for a very old Sun non Sparc box. But have had to refurbish & repair some tools first. Really need a modern multimeter. Will try to win the one here 😊
Interesting to see you using solder braid rather than a desoldering tool like a solder sucker - is this a personal preference or is it better on older boards to use the braid over a solder sucker for example?
@@Nebbia_affaraccimiei pad ripping is more down to the board than what you're doing to it. Although rough handling can make things go bad. Some pads on boards just lift no matter what you do. Either the glue they used sucked or they didn't make the ring big enough in the mask. But that's all repairable especially on them old single sided boards. Delta makes great boards though. That board is a tank. I would like to see what made that one scorch mark on it.
Just the easiest thing to grab to be honest. I thought it was good enough for the job, which it was, and quicker than waiting for my vacuum desoldering gun to warm up.
@@LearnElectronicsRepair Single sided boards it doesn't get any easier. When I worked at a board house we didn't have any solder suckers. We had braid. We'd also just slap boards to make the solder fly out of them. To slap a board you'd heat the joint with the iron with the solder side away from you. Then once it was molten real quick take the iron away and give it a sharp rap on the edge of your workbench. The molten solder just flies out. It's a pro technique.
if in the past it was possible to make a power suply as simple as this, why did we have to complicate ourselves? how much primitive is this source and where does the PWM IC driving performance start?
I could see more dodgy solder joints in the video, and the lose resistor don´t seem on completely in the end so I would had scraped the legs before soldering it back first. I wish you would had taken a closer look at the two other power resistors you see have burned the pcb around them since they very likely have bad solder too but I could not get a good view of them. I think the PSU was dead because something is still lose in it and tapping it temporarily fixed it
🥳🥳🥳 Yeahh back to the eighties 🥳🥳🥳
Thx Richard 👍👍👍 . Old AT power supplies are indestructible✨️✨️.
If you can fix the old hardrive a dream and wonder come true 🤩🤩🤩🤩
Heya, nice repair love to see these old AT psu. yes would love to see you try to repair the HDD
Happy days I worked in a school we just swoped this out to get them working. Think they were sent away to be repair individual parts.
Thank you for that nice video! Sure it's worth to try to get the mfm hdd running! 😊 My opinion is that the entire machine is worth something. There are some people who can use that pc with DOS or even unix. There are some nerds outside who appreciate this old robust technics. Some years ago I made my own custom router from an old pentium1, with 6 LAN cards, programmed under Linux. It ran for years day and night without any problems, till I met my wife and my life changed.
This is good old stuff worth to keep it alive. I'm very sad that I don't have my first pc anymore. A fire destroyed the storage place. But I still have my first 486, and I will take it out soon to reactivate it again. It's just a matter of time, with a family with two kids. But I'm sure I can give my sons lessons with that. Of course with DOS. No one needs Windows.
I remember I was the only one in my class who knew DOS, and everyone went to me asking me for help when Windows didn't work... 🤣🤣🤣
Coincidentally, I was at a friend's house this afternoon checking the contents of some old IDE drives. The last one was from an old 286, one of the early WD IDE drives. It would spin up but wasn't recognised. As for the old Tulip pc itself, the PSU was dead. It is going for salvage with any profits going to charity so I didn't bother investigating further.
Thanks for this video I have a few old power supplies I need to fix.
Can you tell me what Band/Model camera you use for over the bench. I like that it zooms in so clearly. Thank you
I would have cleaned the leads of that power resistor before resoldering it. There appeared to be some corrosion or other substance on one of the leads that stopped it from taking the solder.
There's only three rules to soldering, clean, clean, clean! It seems like just one rule but you have to clean a few different things. The tip of your soldering iron, your solder and the stuff you're soldering all has to be clean. Contamination is the leading cause of solder failure.
I had a bit of trouble soldering it but a good dollop of flux did the job. Otherwide yeah I would have had to clean them with something abrasive.
I love that error message, keyboard error press F1 to continue.
classic PC paradox
Very useful information. Thank you.
Very cool! Thank you for sharing AND for your guidance! Take care!!
I'd tap the HDD with a rubber handled screwdriver on the side while plugged in, or another thing I used to do was spin it in your hand like trying to open a door handle quickly, sometimes stops the "stiction" not that I can spell it lol and I've tapped them with my palm on one side corner... had a few RLL drives (one a massive 8Mb full height 5.1/4) get stuck as well as MFM's and then some ticked like a clock with a metallic springing back - bad reads NBG after doing it too much haha
Or maybe the solder joint at the resistor is still a little bit dodgy and you moving the PSU around caused it to make contact again?
That aside: You may want to take a quick peek into the metal can at the mains input connector. There's probably a filter in there and that *may* have a RIFA cap, which are infamous for spontaneously releasing magic smoke of a particularly foul smelling variety.
Smoking the RIFA
@@1pcfred PMSL
delta is absolutely still in business
their current product line doesnt look much that tho lol
The interesting part is that a vintage PSU has still good enough caps to run. You take a newer PSU and is already dead with dry caps ;). We all "love" modern electronics :D when they fail so easily.
But, hey, Sony keeps up really well I'd say.
There may be a loose connection in the power supply because the fan first started spinning when you tapped the case at 26:56
What an aswesome find! I'd love to get my hands on one of these things one day.
thanks for your lessons!!
some times the stepper motor can get stuck, if you can get to the stepper motor bearring a couple of drops of sewing machine oil in to the bearing could free it, did'nt hear the hard drive spin up try giving a tap when booting up.
Good fix on that classic Delta supply. Delta is the big mamma jamma in PSUs. You think you're buying this, that or the other PSU but you're really buying a Delta half the time. Their house brand stuff is solid too. You should get all that old glue out of that PSU. It looks like it's gone funny to me. Not funny ha ha either. Old glue going conductive is a common failure.
Should have scoped the rails for noise, there could be some iffy capacitors
Won't Araldite soften when that 18 Ohm resistor gets upto temp? It has a chunky heatsink for a reason.
Araldite is quite heat resistant to be honest
Worth a try on the hard drive , will make interesting content whether it works or not.
IMHO it's always worth try to fix old AT power suppliesI had to fix some. Also a SONY PSU for a very old Sun non Sparc box.
But have had to refurbish & repair some tools first. Really need a modern multimeter. Will try to win the one here 😊
Thanks
134.1w PSU according to the PCB
Interesting to see you using solder braid rather than a desoldering tool like a solder sucker - is this a personal preference or is it better on older boards to use the braid over a solder sucker for example?
I saw some solder sucker rip the pad up, probably the braid + flux is a much more gentle approach
@@Nebbia_affaraccimiei pad ripping is more down to the board than what you're doing to it. Although rough handling can make things go bad. Some pads on boards just lift no matter what you do. Either the glue they used sucked or they didn't make the ring big enough in the mask. But that's all repairable especially on them old single sided boards. Delta makes great boards though. That board is a tank. I would like to see what made that one scorch mark on it.
Just the easiest thing to grab to be honest. I thought it was good enough for the job, which it was, and quicker than waiting for my vacuum desoldering gun to warm up.
@@LearnElectronicsRepair Single sided boards it doesn't get any easier. When I worked at a board house we didn't have any solder suckers. We had braid. We'd also just slap boards to make the solder fly out of them. To slap a board you'd heat the joint with the iron with the solder side away from you. Then once it was molten real quick take the iron away and give it a sharp rap on the edge of your workbench. The molten solder just flies out. It's a pro technique.
if in the past it was possible to make a power suply as simple as this, why did we have to complicate ourselves? how much primitive is this source and where does the PWM IC driving performance start?
lol i still have some new 5.5 floppy disc
Why does everybody on YT use so much freaking flux? Your solder has flux IN IT.