This is the most common fault on a dead TV!
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- Опубліковано 18 чер 2024
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Do you agree this is the most common fault on a old TV?
Yes on older TVs the caps used to fail and bulge at the top, I repair TVs and these days I never see that fault , most common issue now is led backlights
On Vestel tv PSUs (mainly the 17IPS61) the high voltage diodes on the secondary side near the transformer are the most common fault as far as I've seen (those boards are found on philips, sharp, telefunken and other off-brands tvs from the fhd era). A part from those, the rest usually are caps failures... Both easy to find and easy to fix issues.
@@matteo_z I repair TVs and sell parts there is several vestel boards where the diodes fail , the board you mentioned I sell the diodes repair kit for version 2 and 3 , I sell 6 pc diode repair kit for them, vestel boards are used In even Panasonic and it’s all junk vestel stuff, it’s also used in bush, Polaroid, toshiba , jvc , techwood, Hitachi,finlux,digihome,linsar , Luxor and so on, not all Panasonic are vestel, there more expensive TVs are not vestel , sharp and Hisense use a different manufacturer to make the boards then we got Samsung and LG who sometimes make there own or use a dedicated company to manufacture them and Sony get a company to make them aswell , me personally I stick to oled TVs now as led backlight TVs are all rubbish
Not only TVs, I fix the same fault in most power supplies, even Xboxes or PC power supplies. Not only those electrolytic bigger ones, even the SMD type as well. Just now I fix one Toshiba laptop which will be posted on this YT channel here where 1 0805 size and 10uF made a short to the ground and this laptop is dead.
@@ImranAli-rp4kd agree, I hate especially those edge backlights. Those diodes are up to 6V and are too dense there. Plus, those no frame TVs are too easy to break on top of that, or Samsung's no screw ones the same. A modern rubbish.
“…Capacitor is eating, eating all those spikes.“ That’s the best explanation I have heard for what a capacitor is doing. You’re awesome.
Capacitors eventually get fat and bulge, due to eating all those spikes.
Our Dog, Spike, is missing.
Now i know why!
ROFL
😁😅😂🤣✅
Electrolytes heat up and dry out over the years, But if manufacturers would put a cap with a higher voltage rating it would last longer.
@@samsscia And then they would sell less tv's. Also higher voltage caps are more costly.
@@samsscia Electrolytic capacitors with lower ESR (Equivalent Series Resistance) will run cooler, which is good. Also, in some older equipment the original electrolytic caps may contain a formulation of electrolyte which leaks prematurely. Reportedly the formulation was purposely sabotaged by a certain Japanese company to thwart suspected industrial espionage, but unfortunately the bad electrolyte formula got into millions of caps before the word got out.
A lot of shops will not work on old things like that. When a person asks for repair on old item, they usually have little money.
Good on you for fixing it.
When I was in 8th and 9th grade, I was taking electronics classes in Junior High School. I would bring old radios, mostly tube type, to school and fix them. I enjoyed it a lot. Often it was just the power supply filter capacitors like this, but I also replaced bad capacitors in the circuits. I would then adjust the tuning coils, and those old radios would work great! Often I could get better sound and reception than a new radio.
I took electronics in High School. We had a lot of Tube power supplies in the Lab. No calculators back then. Used a slide rule. It hung from a sheath on my belt. Looked like i had a small sword 😃 . I remember the day our instructor came in and said there is this company called Intel and they make something called a Microprocessor. The instructor went on telling how digital logic worked. I leaned over to the guy sitting next to me and said...THAT WILL NEVER TAKE ON 😆
@@meTimetraveler I was in college. Took like one semester and all the engineering students replaced their slide rulers with the HP57s
Wow same here for me! When I was 15 years old I worked in a TV repair shop on Saturday’s I was hired to help the tech pick up and deliver TVs to and from the shop! Prior to that I earned my novice ham ticket in Boy Scouts. And I had built several Heath kits. The shop started letting diagnose failures with supervision. Latter in high school I started to learn to fly airplanes while still going to the technical school for electronics. I worked in electronics for several years combining my flying skills to travel as a Field Service Engineer on medical ultrasound equipment. The company provided cars and an airplane for work. It was great for two years the company was bought out sold the airplanes that is when left. And started flying full time for a living.😁🛫
@@TheFalconJetDriver That sounds great.
Found a 42" LED set junked on the street this week. Mains cable had been cut off and it was soaking wet, but the screen appeared intact, so I thought I'd take a closer look. After I'd let it dry out for a couple of days I bodged a mains lead onto it and powered it up, surprise surprise, stuck in standby. Opening it up revealed the standard Vestel boards, and the equally standard bulging capacitor. A few pence worth of parts, and I have a rather nice big telly in my living room now. :)
If you let them dry out, there really isn't anything water can damage. Most mainboards/ electronics boards after flow soldering or whatever they are put in giant industrial washing machines to wash off all the leftover solder paste/flux and whatever
How do you work it without a remote?
@@hermanhale9258 It's a Vestel board mate, I have a box full of old telly remotes that are close enough to work with it. ;)
Sorin "You can see fault from airplane"....I'm stealing that one! 🤣🤣🤣
Then he says "maybe you can't see it, let me tilt it for you". What a pillock
Great and knowledgable videos. Don't need to watch item being unscrewed for about 3 minutes plus. Thx
Great job! This is truly a common problem and I have repaired my Samsung ($$$) by replacing the two capacitors shown for under $2 when repair quote was $400. One point, though, capacitors have polarity and need to be replaced respecting the polarity or new capacitors can fail immediately. I suggest pointing out a bit more clearly how to determine the polarity of a capacitor and then how to know the polarity marking on the circuit board. This is best done before removing the old capacitors. Good job right to the point.
Not all caps are polarized. The ones that are usually have a large stripe designating the negative leg. Unpolarized caps are definitely more uncommon and are usually used in power supply overage protection.
Only Electrolytic capacitor are polarized.
I take a lot of pics of stuff I work on first
All but the cheapest TVs have the polarity marked on the PCB, but if not look at the strips and mark the board where the stripe with (+) is.
Nice Fix!😉
I also miss fixing TVs , its just not worth it nowadays......😑
Used to fix a lot of them and also PC Monitors had the same problem.
I stared my apprenticeship repairing CRT-TV's which mostly had cold solder joints and dead line-driver Transistors
Then LCD-TV which had a lot of problems aside form those caps...(dead CCFL inverter or LVDS TCON board/cable)
Hi Sorin
From my following your vedios. I was abled to repair my Air conditioner board.
It was on but outside compressor not starting.
I tested the outside unit by bypassing the AC and it worked . So the problem is whether from the relay or something else.
I tested the relay and is us good when I checked the voltage on the main board traces I found less than 12 volts.
As I learned from you I focused on the capacitor after rectifier and changed it even there is no signs on it that is blown.
The Air conditioner is working properly.
Thank you so much Sorin for your valuable lessons.
I love it, just discovered your channel while trying to 'learn' to repair an 24v inverter (solar inverter) and after watching you repair things and some of your teachings, it's really starting to sink in. Thank you for sharing your content. Just realised you're in the UK too :). Watching a lot of your electronic lessons as well, watching you repair stuff is great though. I'm working my way through your TV repair playlist...
It's really interesting when someone can share and explain their knowledge to you ... I really appreciate you doing this!
The only issue I have, is while looking up parts for my inverter, I have to buy from China and they take forever to buy... I think my new capacitor is going to arrive in a months time! :) It must be hard to build up a stock of repair electronics.
Thanks!
Bravo. I really liked your approach to making the caps better by upping their voltage rating. Bravo. I salute you.
I am now subscribed. Thank you for sharing your knowledge and skills with us.
The main man,just love learning from this guy and a good video once again thank you
I am happy when you say job done . Thank you Sorin
👍Thanks for another great instructional video!👏💡
Capacitors are no longer the most common fault. I'd say back lights and mainboards at the top two issues with the newer TVs.
That's what happened to my telly.
I was hoping this would be "how to fix a backlight on a LG" hehehe
Couldn't happen a worse time.
I was beginning to think it had an expiry date. Haha... Mission Impossible style!
The funny thing was, I rang 3 repair TV adverts...... they were all the same guy!!? Lol.
He told me to bin it. 3 times. lol.
Is he right? It's not what I want to hear, hehe,... with the World Cup coming.
Thanks Sorin! Amazing video, I like your energy :) always makes me smile :D
Yes a tv repair! I like this always easygoing.
Thanks for the update
Thank you for your video. I learned from you today👍
I was so proud when I opened up my dead Vizeo monitor, and found a burnt ceramic capacitor. I got a replacement on eBay for peanuts, and a Walmart soldering iron, and I was back in business!
Great job! 👍
Love your videos.
I had an old 32" Westinghouse LCD tv a few years back that was dead (but the audio still worked) and the power supply PCB had a few bulging caps that I replaced and brought it back to life. Saved about 300 bucks
thank you for sharing this with us!!!
I love how you explain why the part went bad.
Used to fix TVs for a living myself, back when I was very much younger. He's right about the power supplies being the fault, quite often. Often, in those earlier TVs, the part of the power supplies, it was the part of the fly back capacitors. A 10 microfarad cap was dead or sorted out, and then the video part would be displayed as a horizontal line or maybe no video at all. The audio would be okay though. The value of the display cap? 10 micros at about 150 volts.
Thank you very much for the information
Thanks for great videos
gotta love that quick fix.
I had a 42" TV that had a bad Power Board. It was an older TV, and the replacement board was a few dollars cheaper than buying a new TV with a warranty. I suspected the capacitors were blown, but saw no visual indication of that, but almost 100% that was the problem.
It's the heat that "Jiffy Popped" those capacitors. A higher working temperature would help, higher working voltage wouldn't hurt either. Good quick repair Mr. Sorin.
I fixed my own DAC headphone amp by replacing two bulging capacitors, I was so happy because that thing cost me $650
Nice quick repair
Good job mate 👍
I just got a not working LCD from my neighbours CCTV system that he wants me to have a look at while he is using my spare one. This video couldn't come at better time as I know nothing about TVs :D Cheers, Sorin!
Need any help give me a shout
@@wisher21uk
You could give me a bit of advice, please Mr Man. Hehehe. No joke intended.
The BACKLIGHT has gone on our 47'' LG TV..
Is it for the bin ?..... As someone told me.
@@MrBollocks10 no it’s fixable what’s the model number it’s on the back 47lbxxxxx
Power supply smoothing caps, are always the first thing to look for , after checking for power input and the rectifier.
Nice video demonstration...
Tip: A 470uF/25v can be replaced 470uF/35v if there's no 25v...
You can also use an ESR meter to detect a dried up electrolytic capacitor...
Years ago I randomly try to fix a flat TV faild like this video thanks 😊
Thank you for the clear and simple explanation with a few good tips. I’d have burned two fingers opening that blocked solder joint before inserting the new cap. 😂
Your idea of an old TV is a little different than mine. No tubes (valves) in that one.
My exact thought :D
I thought the same thing. But I also thought too, WAIT... THERE'S NO CRT! LOL That's not "old!"
Give me an old RCA "55" chassis (hybrid) and I'll show you "old."
😁😅
But if ya look its got scart and s vid inputs.
Remember those tube type televisions where a technition would come out to your house take the back off the tv and start resoldering those big circuit boards and changing capacitors etc. I believe a lot of tubes were made at Mullards in Belmont Durham.
Factory sadly gone now
I agree that caps is the most common fault, but sometimes the power regulator will fault. That component is use to ensure a steady voltage through all operational conditions. Regulates voltage during power fluctuations and variations in loads.
Old school skills! Impressive!😃
The DC voltage rating of the cap, has absolutely nothing to do with the ripple current rating. The higher the capacitence, the higher the ripple current rating
Thanks for the video, I have fixed a Samsung Monitor the same way, Bad capacitors just like that TV's. Is that a Weller solder iron? I'm using my vintage Weller WTCPN
great video.. would the same thing happen to a pc monitor ?
hello sir ,excel video as usual . i have couple of questions regarding what you said about higher capacitor . a) higher voltage makes sense , is it also okay to use higher capacitance ? b) is it same formula for SMT capacitors on laptops . c) i am working more on car diagnostics tools /boards . there are RELAYS which play very important rules . now my question is can i use higher vol relays ? for example there are plenty of 5volt relays , can i use 12 volt ? nd is it ok to have mixed 5v and 12v ? many thanks i really hope sometimes you make videos about car computers / ECU and diagnostic tools .
Depends on what you mean, if you're talking about 5 volt or 12 volts coil voltage, the answer is no you cannot interchange them. Even if they work, they will be inefficient.
nice an simple great video my friend
Most common fault. Few days ago I fixed 3 old monitors with this issue. Eazy peazy
you nearly burnt my nose with that soldering iron!
Eating all those spikes. Jesus. I love that statement sir. Good Work sir
On monitors too,i am also checking with esr meter..
have you ever heard of an incorrect HDR setting causing picture loss, not picture signal loss but just making the screen go black? I have been using my 55 inch 4K RCA TV as a computer monitor for years. Throughout the years I have had a constant problem of the TV picture randomly going black but still having audio. This will happen when I'm watching videos or sometimes looking at a photo slideshow. I will have to change the input in the menu to a different source, then change it back to get the picture back. The really weird thing is if I went to the exact point in the video where I lost picture the TV would lose picture again. I just recently turned off HDR on my TV and I haven't had the problem since.
Watching from philippines
I miss the old days of in home component level repair of Crt rear projections and direct view, Especially the Mitsubishi 40 inch, Lots of fun. I went through a lot of capacitors and convergence i/c's.
GASP! HOW DARE YOU use the "C" word! ROFL 😁😅😂🤣✅ _(convergence)_
I remember those Mitsubishi 3-crt projectors. OMG they had a gorgeous picture and the color rendition was perfect. Unlike some other brands where the picture was good, bright 'n all, but the color was poor.
Back in my day of TV Repair, having to perform convergence on the old CRT TVs could be painful. Especially when components on the convergence board were not up to par.
This is one reason I just love our current technology. No convergence required.
I'm also glad that I'm retired and don't have to repair anything anymore. Well... except for our own stuff here at home. LOL
Yup. Same problem with 90% of the failed LCD monitors. 15 minute fix, minimum charge + parts. Usually around $50. I could them all day long.
Thanks!
Thank you!
I usually hope for blown caps when I'm opening the set up but more often than not it's backlights, diodes or a main board issue.
I know, that's why we are taking only dead TV's, otherwise we are losing too much time
Newer TVs the led backlight is a common issue and boards fail aswell
So my Visio main board is bad ... does that mean TV death? Everyone seems to be down on replacing them.
In SMPS the frequency is very high, so the capacitance becomes relatively unimportant. What is important is the internal resistance and parasitic inductance of the capacitor. The two 470uF were put in parallel not so much to build the capacitance to 1000uF, but to reduce resistance and inductance.
Whether you made up 220uF or 2200uF likely would make no difference to the circuit. Consider having a stock of polymer capacitors which feature long life and low ESR.
Why don't you explain smps and ESR for the audience my assumption small module power supply? ESR? Something like Electro ..... Resistance?
Bob Parker blue esr meter is an absolute must . Not all caps are swollen.
So you have to remove all caps, measure, and re-solder all the good ones?
Not sure. I don’t trust the Internet. Maybe it was the caps, maybe not. I'm sure your fans enjoyed the show. That's what brings in the cash. you're awesome. Like to see you fix a USB-C power input on an LG Oled tv. That would be interesting. Good Luck. 👍🏼
Swollen caps are def broken, used to be caused by faulty construction, was a very big thing around 2004. Replacing them fixed many serious problems, so..if it works after replacing swollen caps that most likely was the cause. I think nowadays they don't tend to swell that often. Still good to check. And they can be broken without haven swollen unfortunately.
A lot of people want to repair their TV. Not everyone wants to go buy a new tv when it breaks. But not a lot of people repair tv’s anymore and it’s sad.
This is why we need to move to home DC ASAP!
When I think old I think back to the big black&white CRT TV I saw the moon landing on in 1969 It had a Bakelite case and dad called it the black box. I used to go to Sears with him to use the tube-tester and buy tubes.
This is not old to me.
U right, i changed the title, thank you
Thank you for your video :^)
GENIUS
3.5 mins to open it! - but video APPRECIATED - old git, UK
Spare parts problems are common to technicians around the world. .Especially the parts that are older than 10 years and the datasheet is difficult to find. Where do you have a reliable source to find it . Thank you very much ..
So, correct me if I'm wrong, but are these caps the ones that are in circuit on the output lines of the rectifier, before a DC regulating circuit, the ones that filter out AC ripple? Is the fact that the caps were abused to be blamed on fluctuating input ACV outside the V input limitations of the rectifier?
You are correct about the position of the caps, low voltage DC side smoothing it all out. I think it's more likely they were old and cheap, rather than abused. Electrolytics all have a shelf life, some better than others. As for his choice of values, no problem with a higher voltage rated cap, and in this case he got away with a higher rated capacitance. But to be honest I'm not happy that this video suggests it's that simple. There are many other cases where you need the right sort of cap, never mind the values. I think the guy in the video knows that too but was just sharing how to quickly fix obvious output smoothing cap failure.
Old is a relative term. Old TVs had tubes. The most common fault was a tube going bad, or possibly an overheated capacitor.
Classic bulging capacitors, I`ve fixed a power board today also. Same fault
Nice volg 👍👍
Back in the day it was horizontal output transistor bridge rectufier diodes and cold solder joints
EVERY older TV that dies on me has been a recap job. I replace them all but probably could get away with just replacing the Power supply caps. Usually if not a power issue it will blink a code that points the way.
An LCD screen (46"), about 11 years old, regular household daily use develops horizontal bands of snow that flash. Broadcast image still there to, sound is fine.
Could this be a cap issue?
(Toshiba 46G300U)
Thanks for sharing your repair. I have a dangerous amount of electronic knowledge and skill. Looking forward to using it, and your work inspires.
No that would not be a cap issue
What about the Farad rating of the capcitor, should it match the same as the faulty or higher
electrolytic caps can and do go bad. You can tell the bad ones for they bulge on the top. only electrolytic caps are polarity sensitive
Thank you for an informative video. We have a Samsung TV model UA43NU7 100S, it recently puts out a dark screen, no picture on about one third of the screen, on the right side. The rest of the left side is fine, what can be the cause of this? Your help will be much appreciated, thanks.
Great video thanks! But that guy with the parcel tape needs to bugger off!!
Last time I fixed a TV it had a bad 33GY7A vacuum tube!
I was working as a bench tech 20years ago repairing desktops and Laptops for a company. About the puffed-up capacitors. What i found out it was from industrial espionage. Someone broke into a large capacitor manufacture's computer system, could have been Nichicon not sure. They stole what they thought was the formula for the capacitor electrolyte, but it wasn't. The company kept the formula in 2 parts and the thieves only took half of the formula and with that they made counterfeit capacitors from all the major companies. Around 2001-2003 we received a lot of motherboards and power supplies with puffed up capacitors. Nothing else wrong just the puffed-up caps. A few years later I got a Job working "IT" for a very large company and they had Dell...we had a flurry of Dell's with puffed up caps. Then after the caps we had all the Dell laptops with bad GPU's, seems if you did not clean the cooling fans and they got clogged the GPU chip would get hot enough to de-solder themselves😃. I heard of people putting their mainboards in the oven to reflow the solder. Never tried that b/c Dell extended the warranty and took them back. One time they sent me 20 new laptop mainboards it was so bad.
how is the fuse good if it doesn't make any sound when you touch the terminals ? or maybe I'm missing something. Love your channel... all the way back home:))
Bad capacitors are the #1 cause of failures in HVAC systems. They are much larger, and cost about $10. I keep one for my AC, next to the one that will probably fail one of these days.
I've repaired a bunch of tvs over a period of 6 years. I've never had one where The capacitors were blown. You youtube guys amaze me when you come on with this problem. Makes a easy presentation, doesn't it? You guys are too funny! This is not a common problem with tv repair.
Oh.
And make sure you use quality brand caps rated for power supply's (Brands: Rubycon, Chemi-con, Panasonic, Matshushita, Nichicon, Sanyo, Hitachi, Samxon (except their GF series) with 105'c+ rating) otherwise they'll pop again soon.
Some of the crap brands: G-Luxon, Su'scon, Lelon, Ltec, Jun Fu, Fuhjyyu, Evercon.
Good job............
"old dead TV".... i was looking forward to see an analog one :o
I ve got a hot tub, and the motor was playing up, when the engineir turned up to check the motor, we noticed the capacitor was "buging" £600 for a new motor! i asked him how much for a capacitor, £20 he replied, so it was a £20 fix!
Hi everyone. The secret rule on nearly every plasma, tabs etc is vol dn + pwr on.
Those capacitors (electolytic) were almost certainly manufactured in China. They ended up in HP, Dell and other PCs.
Ended up in top line servers at the time like HP ML350 G5s. Our company got saddled with repair costs. And all because of scammers in China using inferior materials.
I has 10 year generic PC I try to turn on recently and over 20 caps were swollen.
Pregnant capacitors are the most common SMPS fault I see. Problem with many of those style of device is the PSU is on 24/7, the cap is subjected to 70khz HALF wave pulses for years at a time. Often takes longer to open the device than to replace the caps. I will always change the small bootstrap electro in the primary circuit whenever I change the secondary caps.
Bulging caps are common on lots of electronics.
If you have a computer that's acting up, whether it be a laptop or full PC, always check caps on the motherboard after the PSU is confirmed working. You'll probably find a bunch and not always in the PSU that's at fault.
I decommissioned my old Lab computer a couple of years ago. It was very old.
When I took the motherboard out, most of its electrolytics where about to give birth. LOL
I find that caps, over the last 20-30 years have really degraded in quality from the factory. Just cheap crap.
@@BlondieSL Not to mention a lot of electrolytic caps are rated at 85°C which in my experience, is unsuitable for any power supply where components with heat-sinks are in close proximity to them. I usually replace the suspect ones with 105°C high tolerance / low leakage / good quality types (ESR tested prior to installing - I never do this blind). Typically LG, Panasonic, TEAC and some Samsung DVD / VHS combos made between 2006-2009 had this very problem.
The manufacturers choose poor quality electrolytic capacitors in order to assure that electronics will fail soon enough for planned obsolescence.
relaxing 12 min!
You need a desoldering tool. Quick and easy to prevent over heating the trace.
Outstanding!
Is it worth replacing led backlighting strips in an LG 47lm76 tv? I'm not sure of the cost to repair vs new tv.
Ihave a lg 47 with bad backlights. I bought new backlights waste time.
@@cutterbacon it's a 3D tv. Not made anymore.
In recent years I have repaired many satellite receivers.
ALWAYS blown electrolytic capacitors.
I replace them with the same ones that can withstand higher temperatures.
then those receivers are good forever.
Its working man!!
Any caps that need replacing should always be replaced with higher voltage caps, not just the same.
wish I could find a video on fixing an LCD backlight issue that's not the actual LED strips that are damaged.
You should at least check the defective part with rlc multimeter to make sure its the defective one. I repair my plasma TV 50" when it went out with a big pop, really loud. I open it I could smell some burn something. So I look at the board it was a capacitor, remove it measure it no value. Replace with the same value it Works again.