This reminds me of the fiasco with Sony TV's underated on/off switches they issued a service bulletin and provided free new switches for all the models affected. We spent weeks replacing them, even back then the attempts to keep costs to a minimum backfired! As you have said, the backup from that era has long gone

Thank you for sharing this interesting video. How could a major manufacturer make something so bad? It's amazing this machine got past quality control when considering its design flaws!

@TheDripSpotter

5 ай бұрын

Major Manufacturer built on advertising and producing junk they You can’t get Spain parts for- I always buy Panasonic at least You can get parts for and Circuit Diagrams so that it can be repaired to Component Level.

Samsung and capacitors who would of thought! Thanks Michael very interesting 😊

VHS recorder/ players were so amazingly complicated electro -mechanical I really don't know how they actually worked. I had mine for 20 years long after they were fazed out but amazingly it just kept going and was working when I gave it away.

@michaeldranfield7140

5 ай бұрын

Most of the machines I use to fix way back then had mechanical problems, so your are correct, it's amazing how some did work, especially the Panasonic G deck.

Great video Michael..I still have my VHS from the 1980s

Hello Michael, This brought back bad memories! I repaired a number of these as well with the severe damage mentioned. As you say, a poor psu design. If only they had repositioned that capacitor somewhere cooler, the machines would have survived a lot longer!

@TheDripSpotter

5 ай бұрын

Yes and made the whole thing properly it might have worked.

That was very interesting Mike, I sold lots of those Samsung VIK machines back in the day and don't recall ever taking one apart in anger, perhaps I was just lucky that I didn't get any back.

@michaeldranfield7140

5 ай бұрын

Interesting, this was the most common problem with these and even though out of warranty Samsung supplied those kits for free, you won't get any support like that again.

i am glad to say we never got any of these in for repair as i had heard others moan about them

Spot on as always Michael. 😀😀

Hey Michael. I clean video heads literally every day (sadly!) Old U-matic tapes in particular shed like crazy, requiring multiple head cleanings. Anyway, over the years I've used those lint-free cotton squares from RS, Colclene wipes, chamois cleaning swabs, etc.etc., but these days I just use ordinary printer paper, moistened with 99% isopropyl alcohol. A single sheet thickness, so you can actually feel the head tips through the paper with the fleshy pad of your fingertip. Some might say that paper is too harsh, but I doubt that claim myself. I use this method even on HDCAM-SR head drums (about $16k for a replacement drum, lol!) It's very easy, with white paper, to see the contamination that's been removed, and know when the heads are spotless.

@michaeldranfield7140

5 ай бұрын

Yes, that's the ones I use, or use to, I keep forgetting to order more, I have never used anything else in fear of damaging the head tip, I could always try paper on an old machine that does not matter though.

@njm1971nyc

5 ай бұрын

@@michaeldranfield7140 I've been using regular printer paper for a couple of years now, like I said, even on a $100k HDCAM-SR deck. I have proper Sony head cleaning tapes for the HDCAM, for DigiBeta, for DVCAM, and so on, and they're fine for light contamination, but for a nasty clog the paper method works great, and I can't imagine it's doing any harm. Shouldn't be anything harder in paper (mohs scale wise) than the head tip itself, I shouldn't think. These decks are my own property, and I certainly wouldn't want to damage them. It works 🤷‍♂️ 😊 Give it a try!

Similar design whoopsies has happened to some top-end gear as well. I have an iiyama VisionMaster Pro 510 22" flatscreen CRT monitor monstrocity, it was about 1200 USD in 2001 (it's a rebadged Mitsubishi, but I don't know the original Mitsubishi model number). The B+ rises to 140V from 80V, and fries the RGB output IC, explodes a few capacitors, and kills the horizontal output, might even kill the flyback. The reason: a tiny capacitor, IIRC 22uF 50V, AND 85°C rated, wedged between heatsinks and power resistors. I don't remember the details, but if said capacitor goes open, it somehow defeats the feedback of the power supply. This shouldn't happen, they screwed up something with the PSU design. I bought mine basically for free in 2004, it is still under repair ever since 🙄 .

Very interesting Michael, thanks for another great video.

@michaeldranfield7140

5 ай бұрын

No problem, thanks for watching, more interesting stuff on the way soon.

Interesting video. I recall Samsung used to take a few short cuts , BHS head office in London equipt all there Pc's with Samsung monitors , intitally from new the picture looked super sharp , but we found that thay over drove the crt guns to get the quality. But in an officec enviroment thay went flat very quick. We of cource took this up with Samsung.

@denisconnolly5064

4 ай бұрын

Yes, Samsung branded CRT's did indeed have a short life. Not just in Samsung branded monitors but the other manufacturers that used them.

Excellent exsplination Michael thank you an easily understand where Samsung went wrong designed had no practical in field experience possibly straight out of university just like Sony with the dam great wire wound resistors burning a hole in the pcb

@michaeldranfield7140

5 ай бұрын

I remember the Sony with the burn up on the wirewound resistor, I'm not sure if Sony didn't supply a repair kit free of charge too.

I always clean VHS heads with a piece of paper soaked in isopropyl alcohol. Works a treat without the risk of damaging it. Were these decks decent units at least (outside of the PSU trainwreck)...?

looking forward to this, Thanks Michael

Great post Michael, fantastic autopsy, seem to remember a similar but catastrophic board burning episode with a certain model of Japanese H-tac-i 21"FST telly back in the late eighties? At the time I worked for a small independant that relied on repeat custom, difference was I seem to remember the manufacturer chose to "cock a deffun" this left us with about 20 tellies in the store room that were deemed unrepairable, with no support, my companies solution, bite the bullet and give them a Toshiba instead. I dont think my company ever bought anything from this manufacturer again, including audio etc! toshiba did well out of it though!

@michaeldranfield7140

5 ай бұрын

I remember a Sony set suffering from a dry joint on a wirewound resistor burning a hole through the pcb and I'm not sure if Sony didn't supply a repair kit for free which contained a new bit of pcb that you stood off the board on a couple of plastic pillars.

Oh my Samsung! great video many thanks.

thank you Mr. Michael

And people buy Samsmug- they have to be mugs.

To be fair VHS itself was a catastrophic failure. the machines were a mechanical nightmare. soon as dvd came along i threw my vhs in the bin.

@michaelturner4457

5 ай бұрын

As soon as movie downloads and streaming came along, I threw my DVD in the bin 😂 VHS was around and very popular for over three decades.

@Synthematix

5 ай бұрын

Nah i still prefer physical formats, the internet has no stability and can go away at any time.@@michaelturner4457

@interstat2222

5 ай бұрын

I've still got my VCR from the 2000s in use and Blu-ray players. Not going anywhere here.

Power supply used to blow up due to bad caps, always change first when we got them in before power up

C110 is a timer capacitor, 13 months and your time is up! 😇

many years ago when i was a child I watched a TV repair man identify a faulty component using a hair dryer and a tin of compressed air .

similar problems happened with a lot of cheapo portable tvs in the 90s, cap would dry up or a resistor go high and psu output would rocket causing chain reaction blow up, i've done several jvc branded ones with the problem, the psu mosfet shorts and blows a fusible resistor, never blows the mains fuse! still got a few sets of parts to do them 😁

@michaeldranfield7140

5 ай бұрын

Think I know the set it was a Onwa and the protection circuit failed to kick in due to a wrong calculated resistor causing a transistor not to fully saturate and switch off the line drive.

@andygozzo72

5 ай бұрын

@@michaeldranfield7140 pretty sure thats it, Onwa chassis, probably still got the TV magazine issue about them 😉, similar problems happen with many switch mode psus, the cap feeding the base drive dries up causing insufficient drive, making the transistor overdissipate and fail ,

You're right these were a real pain lol

My old boss would say if you're lucky then only the power supply blows up and doesn't take out everything else with it

its a nice looking machine, that dosent mean its reliable tho. . i have a matsui machine from early 90s thats never been repaird yet, alltho its had little use

I'm quite surprised Samsung even survived such a disaster given this was still in the days when they were considered inferior to the big Japanese manufacturers. More recently Onkyo were more or less finished off as a company after their debacle with overheating and deballing HDMI ICs - a problem they did fix and replaced the entire affected board with an upgraded one up to six years old. This caused such a backlash in the States that their sales dried up there - yet Samsung were making videos that basically blew up and took half the electronics out, and are now the largest electronics company on the planet.

@interstat2222

5 ай бұрын

Samsung ended up as OEM for Sony and Toshiba VCRs and combos in the last days of VHS. Seem to have been reliable enough although VHS was probably getting less of a hammering in those years. I thought the VCRs were alright (better than Funai) but not Panasonic, JVC or Sharp quality.

That one escaped me, never encountered that model, sounds like they economised on a cheap opto and paid a heavy price, did i see you had drawn the missing items onto the circuit diagram?, had you experimented a modification.

Lol I forget how many 320 PSU's I've repaired! They were utter junk

so supply 3 would stay at 22 v , 6 volts over , slowly cooking everything down the line . wow

Early Samsung Equipment was of poor quality even Components fitted in correctly , HV Diodes fitted in reverse on Microwave Ovens from Factory etc

How long did these Samsung videos last before the power supply failed usually ?

@michaeldranfield7140

5 ай бұрын

I can't remember for sure but seem to think it was about 28 months to 2 years.

@michaelwaite6725

5 ай бұрын

@@michaeldranfield7140 in the early days of video repair we were told to clean video heads with old newspaper the ink off the print was useful then we went posh and used isopropyl with those colclene wipes .It looked more professional but newspaper ink still worked if you were careful

naughty samsung! that 22v zener ought to have been an 18v 5w type.... and putting critical caps near hot parts, very bad..

@michaeldranfield7140

5 ай бұрын

Yes, 18 volts would have been far more appropriate.

hmm, think i read something about this in 'television' magazine.....

@michaeldranfield7140

5 ай бұрын

I may have wrote it.

dont think a rubber jacket would reduce the heat, maybe fibreglass tubing....?

@njm1971nyc

5 ай бұрын

I know, right? Dull black rubber would absorb heat from the surroundings! A cosy little "hot water tank jacket" for the poor little capacitor 😂 Try shiny silver next time, Samsung! 😄

@michaeldranfield7140

5 ай бұрын

I guess it's all down to what the material is.

@Knaeckebrotsaege

5 ай бұрын

I've seen this in FSP/Fortron-Source PC power supplies as well, except they just used thick heatshrink tubing (sometimes even 2 layers of it) to "isolate" the cap from the heatsink nearby. not quite sure what the point of that is 🤷‍♂

@andygozzo72

5 ай бұрын

@@njm1971nyc or fibreglass tubing, i've seen that used in some cases....

What a terrible design, makes you wonder what they were thinking relying an an electrolytic capacitor and an open loop with no feedback.

I've repaired these I hated them