I was a TV engineer from '56 and retired just as flat screens were coming in. Its nice to see you repairing down to component level, as we did. Very good video 😊

@michaeldranfield7140

Жыл бұрын

You retired just at the right time then, no money to be made on TV repairs anymore, the CRT days were by far the best.

@lawrencejelsma8118

Жыл бұрын

​@@michaeldranfield7140... The problem also is repairing a CRT TV today also. Even having a working digital signal converter to analog signal box, a fixed CRT of say $50 for parts and labor (as a new HDTV of CRT screen size can be $200-$350 in the U.S.) there is risk of further breakdowns of electronic components barely getting by. Even nostalgic computer gamers saying they are spending $200+ in the U.S. on nostalgic old CRT TVs now getting 16+ years old as the beyond warranty last engineering designed day of that TV for lasting longer like a brand new TV. Having to buy a $200 nostalgic 32 inch TV max, 16+ years old, is not worth the risk as figuring out an advantage of buying a new TV of High Definition like this fix on this KZread video at hopefully less than $75 in the U.S. as a brand new 55" of this same model is only $369 brand new and with new warranties.

@nightlore000

Жыл бұрын

I used to work for Rumbelows 1974 Service engineer down to component level .. left the trade in 2003. Thanks for posting .. There's not many engineer's now, they're just fitters ..

@michaeldranfield7140

Жыл бұрын

@@nightlore000 the official take is now to just replace the whole board , there are no schematics for these boards .

@myat.oo1oo90

Жыл бұрын

Thank sir.your explain schemetic drawing is very good.

Brilliant diagnosis, explanation & repair. I’ve never watched any of your videos without learning something new. Thank you for sharing your lifetime of experience here! 🙏

@michaeldranfield7140

Жыл бұрын

Thank you for that.

Skimping on a resistor wattage that basically has no value. Thank you for the insight and circuit analysis. This is how we learn - by sharing knowledge.

@michaeldranfield7140

Жыл бұрын

Makes you wonder if it's deliberately done so the set doesn't last.

@stevejagger8602

Жыл бұрын

@@michaeldranfield7140 I think that is very likely - profit drives this disposability.

Amazing it was just a tiny resistor! Brilliant troubleshooting, as usual, a master at work😁

@michaeldranfield7140

Жыл бұрын

This set was another one of the lucky ones!.

Michael, you are the TV repair wizard! Great job and video.

@michaeldranfield7140

Жыл бұрын

Many thanks for that.

@philipmnkydusdtbreeze5024

Жыл бұрын

DPRTRD IT AARRRRRTTTT WELL DONE​@@michaeldranfield7140🤐

Thanks Mike, very informative. I had the same kind of issue on a different set, the PFC circuit. When heating up the board with a hair dryer then the pfc circuit started working. I turns out that the little electrolytic cap that smooths out the vcc supply to the pfc ic was high esr. That took me 5 hours to discover

@michaeldranfield7140

Жыл бұрын

I did look at the caps in this set as they were very small and looked like they were designed to have a short life but in the end they were all OK.

@angelosanagnostou5550

Жыл бұрын

@michaeldranfield7140 Can you perhaps advise me on a panel issue? I have a Samsung UA55NU7300K with a failed panel. You posted a video on this but there is a difference I wanted to discuss with you.

Thanks Michael for your you tube fault guide, I have a Samsung with the same clicking noise and replaced the SMD with a 10ohm Metal 1/4 watt resistor and the set works just fine, thanks ever so much for your help, parts cost 85 Australian cents.

@michaeldranfield7140

Ай бұрын

No problem at all , glad I could help .

Well explained and repaired. When you have a spare moment (ho, ho), as other have suggested, it may be worth measuring the drop across the 10R resistor to determine what current is flowing and how under-rated the previous resistor was.

@michaeldranfield7140

Жыл бұрын

Sets already gone back but I can try that next time I get one.

@alasdair4161

Жыл бұрын

From the initial diagnosis there was 15.1V on the transistors emitter, if the PFC chip is expecting 12V the three volt difference equates to 0.9W which seems strange especially as the 15.1V was not a fully unloaded reading so probably close to the correct voltage considering the transistor was also dissipating around 2.4V with the 3V difference from it's collector. Maybe the PFC chip runs higher than 12V nominally but requires it's initial start current to not pull it any lower than 12V (cap charging etc). That could explain the resistor's reason for being there.

@ralphj4012

Жыл бұрын

@@alasdair4161 Indeed, hence the suggestion for a little more diagnosis if another set comes in. We can determine that 900mW was being dissipated (in whatever state the PFC was in) and that is clearly way too high for the original and replacement SM resistors. I suspect (I hope) that when the PFC is running that there is very little drop across the resistor. The issue may be that the designers did not account for a pre-start or PFC failure situation (no design can accommodate every potential component issue) As an aside this in no way diminishes the work that Michael performs (which way exceeds my skills).

@AeroGraphica

Жыл бұрын

Could it be the zener that was out of specs, hence the 15v and the resistor eventually failed due to higher dissipation than planned ?

@alasdair4161

Жыл бұрын

@@AeroGraphica They can fail that way. I've even had zeners adopt a strange thermal drift characteristic that makes the fault really interesting to diagnose.

Well done that man, all understood. Inbuilt obsolescence, underated resistor and after 5 years it's time to buy another TV. Great video and thanks for the share 👍

@michaeldranfield7140

Жыл бұрын

It does make you wonder if components are underrated why they used them in the first place , could well be built in obsolescence as you say .

@danmyers7827

Жыл бұрын

@@michaeldranfield7140 Exactly. I would expect that the designers have the necessary knowledge to make the right choices for components. Then there's the CAD software they likely use; that can make the calculations too. I have heard about electrolytic capacitors in flatscreen TVs being deliberately underrated in terms of operating temperature. 85°C fitted where 105°C is needed for a decent service life. When failure occurs after 4-5 years, the TV is thrown away. More turnover for the manufacturer, more waste for the planet. To do things right would cost €1 or less per set, at mass production prices.

@andrew_koala2974

Жыл бұрын

That is how the manufacturers keep their hand in their customers' pocket One could call it the " Electronic Pickpocket "

Your workmanship is great PFC common fault repair to component level

Great video Michael. I noticed the 10ohm res had a zero ohm link in series. Maybe originally they specced two 4.7ohms resistors in series but the bean counters won!

@michaeldranfield7140

Жыл бұрын

Quite possibley and the zero ohm link resistor was much larger!

Most Excellent Michael! 👍Good to see you again in action 👍Thanks for sharing this with us all! 😎

@michaeldranfield7140

Жыл бұрын

still going but summer time is a very quite time for TV repairs , might try some vintage stuff next !

Congratulations mate!! The old skilled technicians are gone!! We have just scrap now.. Appreciate tour video. Very educational for us as young leaners

@michaeldranfield7140

6 ай бұрын

this is a skill that will be lost soon as everything is getting disposable now .

Really great, you identified this problem, your work is great👏

@michaeldranfield7140

3 ай бұрын

Many thanks for that .

Brilliant Michael, excellent walk through off the repair clear and precise thank you 😊

@michaeldranfield7140

Жыл бұрын

Many thanks for that.

Thank you for helping me. Replaced 10ohm because mine have 48ohm. (100). Tv turn on and works for a day already. No troubleshooting. You are master!

@michaeldranfield7140

6 ай бұрын

No problem , many thanks for watching .

i had a similar one few years ago and i tryed hours of hours of toubleshooting and change components,but i was not able to fix it! i was so mad about it, that i dont want to buy a replacement PSU! it was 75$, so not that big, but my frustration was so high, that i refuse to work any longer on this tv! very good job

@michaeldranfield7140

Жыл бұрын

Its not easy trying to find a fault without a schematic diagram but cheaper than a new board , especially when you have the same fault more than once .

Just come across your channel that was a great down to component level repair I have just subbed keep up the great work.👍

@michaeldranfield7140

Жыл бұрын

Believe it or not I don't do that many TV repairs these days, most people just prefer to throw them away and buy a new one .

I love your work pls continue teaching the world. Thanks

@michaeldranfield7140

Жыл бұрын

More videos coming but they wont always be LCD tv repair , I have loads of vintage stuff I need to repair soon .

@ElectronPcRepair

Жыл бұрын

@@michaeldranfield7140 sorry for my poor English, but the way you identify and clarify , resolve and teach present is clear and not forgettable. God bless you. Josey

@michaeldranfield7140

Жыл бұрын

@@ElectronPcRepair wouldn't be any fun just fitting a new board .

Great tip Michael, that's a massive time saver.👍👍👍

@michaeldranfield7140

Жыл бұрын

It's well worth remembering, I have had this same fault quite a few times now on different models.

Great job, Michael.....thanks for the show.

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

@michaeldranfield7140 I used to perform component-level repairs on electronic equipment during the 1970s, and it's wonderful to see that there are still a few people capable of doing this today. Excellent video, thank you for sharing!

@michaeldranfield7140

2 ай бұрын

a good understanding of how these systems operate is useful but the problem with new sets is there are no schematic diagrams so most of the time its more good luck than knowing what your doing, the official thing to do is just replace the whole board but usually this cost more that most sets are worth .

@manclt704

2 ай бұрын

@@michaeldranfield7140 Yes, you are right. Back in those days, detailed schematic diagrams were available for almost all TV models. This meant you didn't have to rely on reverse engineering or guesswork; instead, you could scientifically troubleshoot and fix the issue. Thanks

@michaeldranfield7140

2 ай бұрын

@@manclt704 its very sad the makers wont release any schematics, they must have them from when they design the set on a drawing board .

Amazing repair, I imagine if 100 TV had that fault 99 of them would have been scrapped

@pizzablender

Жыл бұрын

I remember these CDs and web sites with repair instructions. "Sony TV chassis xxx turning on slowly with green line at top of screen, remove screw of lip holing PCB at the front, break way plastic lip, re-solder the voltage regulator". That's literally how I remember that. And indeed that fixed it, turned a 3 hour search into a 10 minute repair.

@michaeldranfield7140

Жыл бұрын

A new board would have fixed the problem but that's no fun, first time I had this fault it took hours to fix with no service manual.

another masterpiece of deduction .

@michaeldranfield7140

Жыл бұрын

and all with no service manual !

This was absolutely brilliant! I´ve learned so much from your video! Thank you.

@michaeldranfield7140

Жыл бұрын

it might just save you from buying a new board .

Must be one of the few left that can do such work. Well done and a great video to watch. Nige,

@michaeldranfield7140

Жыл бұрын

I'm sure everyone could do this if there was a service manual available , most manufactures only supply new boards so they no longer publish any schematic diagrams , you have to rely on datasheets from the chip manufactures to give some clue to how something works , its all well and good but very time consuming .

This was a great learning experience for me thanks for sharing the knowledge.

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching .

Excellent repair video. Thanks

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching .

Good job and well explained troubleshooting.

@michaeldranfield7140

Жыл бұрын

No problem, many thanks for watching .

9:38 that was clever I never thought of that using the iPhone as a microscope I was already contemplating on buying a dedicated one, thanks for that wonderful idea 👍

@michaeldranfield7140

Жыл бұрын

im amazed how good the phone is , far better than the Chinese microscope I bought which is absolute crap .

@oscarmarfori613

Жыл бұрын

@@michaeldranfield7140 Because of your Brilliant Idea, I will just have to purchase a “phone holder arm” that I can just clamp the iPhone into saves me more money for not buying the electronic microscope, it’s a win Mate 👍🏻 thanks again for sharing your brilliant ideas

Hi my friend. I have a ue55d7000 and the same problem... Super to know where to look new. Thank you master😊😊.

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching .

You are genius, i learn new things today. I am so happy 😊 Appreciate

The culprit is not really the 10R but Samsung for not using a component of high enough rating.

@michaeldranfield7140

Жыл бұрын

And given that there was space to fit a much larger resistor it does make you wonder why this was done in the first place.

@waynewayne3709

Жыл бұрын

To save money and get away with it, oh and then sell us a new tv .I stopped repairs on tvs in 2004..on wide-screen sets.. I've done a few over the years but don't have the time anymore.

@michaeldranfield7140

Жыл бұрын

@@waynewayne3709 technically speaking repairing TV s should be very easy now , just fit a brand new board and away you go , the problem is boards are so expensive no one wants to pay , so where ever possible I always look for the fault first , new board is last resort.

@FrankJCarver

6 ай бұрын

I think we have a bit of 'planned obsolescence' going on here. Google planned obsolescence, if you don't know what it means.

Samsung uses underrated capacitors in their power supplies. I have see this problem in 19 inch PC monitors to big TV sets. Since back in 2005 when I purchased my first 19 inch flat pc monitor.

@michaeldranfield7140

Жыл бұрын

you don't see anything now with good quality capacitors like you use to in the 70 s and 80 s .

Good vid Micheal! Why on earth didn’t they fit the higher rated resistor in the first place - SMD resistors aren’t exactly expensive and the difference between the 2 sizes must be tenths of a penny…

@manolisgledsodakis873

Жыл бұрын

I've worked in industry so I can tell you the possibilities: 1. one million TVs manufactured and a saving of one tenth of a penny per set adds up to 100,000 pennies or £1000 pounds. It's not a huge amount but if you can do that with several components it adds up. 2. A TV only has to last the warranty period so, if you make it fail after the warranty expires, that's a new TV sale. 3. the specified component was out of stock so someone used the next nearest "equivalent". 4. the original designer didn't bother to do the maths or made a mistake. 5. the resistor was from a bad batch. 6. glue or other contaminant caused the resistor to corrode (not in this case but a common problem).

@austingraves3425

Жыл бұрын

Then we wouldn't have this video😊

@michaeldranfield7140

Жыл бұрын

Given that these was space on the pcb to fit a bigger one this could have been a deliberate act to make sure the set didn't last too long but someone has also given a whole list of reasons it could be.

@stevebabiak6997

Жыл бұрын

@@manolisgledsodakis873 - although I do agree with all of your possible explanations, there is one that might make more sense: the zener diode at the base of the pass transistor is no longer operating properly, and is at a voltage higher than it’s original nominal rating. Thus the voltage at the emitter of the pass transistor is too high, pushing more current flow to the load. A measurement of that zener voltage compared to its nominal voltage should answer whether this is the case or not. If not, then maybe that 10 ohm resistor was improperly specified in the design.

Wonderful and educational, thank you

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Great job MD! 🙌

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Btw you've got yourself a new sub! 😊 Great diagnosis and explanation and good to see another fellow tech/electronics enthusiast here in the UK! 😊 You sound as though you're from Leicester or further north, Yorkshire perhaps? I'm down south in Surrey 😊

@michaeldranfield7140

Жыл бұрын

No Im from Buxton in Derbyshire , I have always been in the TV repair business but repairs are getting few now everything is so cheap brand new .

Great job again keep up the good work

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Thanks for this, worth knowing as i have a Samsung tv here as a monitor on my pc.

What a clever guy great watching you

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

wow amazing repair!

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

super amazing skills sir michael new sub here. I hope to learn more from your videos..thumbs up to you

@michaeldranfield7140

9 ай бұрын

Don't get too excited, there is no service manuals for most sets now so a lot of fault finding is just down to good luck , unless you just replace the whole board like the manufactures want you to do .

Nice to see this Video,,,i ve same Problem , n fixed them,,,but i need longer time,,,,thx for learning,,Mike

Really well explained thank you!

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Samsung makes to easy to Diagnose their TVs,If you disconnect Main board and it Turns on its your Main board Replace or fix if you know how if it still doesn't turn on its your Power board .Theyre the only ones that do this in the industry Cheers :)

@michaeldranfield7140

Жыл бұрын

That's the only good thing about Samsung but you still don't want to jump to conclusions, in this set with the main board disconnected the backlights were flickering which might lead you to think the backlights were faulty when infact it was the PFC not running .

Very good indeed Mike😊

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Cracking video again ,ive got a sharp tv and its starting to have little glitches whenits warmed up,i think ill let it develop lol before I operate 👍

@michaeldranfield7140

Жыл бұрын

With anything intermittent its best left to develop, you might even find it will throw up another clue where to look if the fault gets worse.

Great fault finding Michael

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching .

Great job, another one saved from the tip!

@michaeldranfield7140

Жыл бұрын

Many thanks for watching .

Great work!

❤ Great job brother 🙏

Interesting stuff, thank you. I’m currently trying to diagnose a Samsung N87 from 2007. Replaced the caps (well the starter round black ones), no joy. Checked standby voltage and it’s clicking 1.8 to 13v.. standby should be 5.3

@hooperwille

4 ай бұрын

I have very similar situation, did you find the problem?

I love your surface mount resistors box. Where did you get it, please?

@michaeldranfield7140

Жыл бұрын

you wont get one of these now unless you are very lucky , it was made by Phillips back in the 1990s to aid repair of the new Phillips G90/ G110 sets that had just started using surface mounted components , there is also a transistor and diode box which I also have .

@chuxxsss

Жыл бұрын

@michaeldranfield7140 Phillips always made good products. They had a calibration lab in Sydney, which we went to very well set up and clean.

Keep the content coming Michael

@michaeldranfield7140

Жыл бұрын

more coming but might be something vintage next time !

Best teacher ❤️

@michaeldranfield7140

3 ай бұрын

Many thanks .

Un televisor mas con una segunda oportunidad gracias a esta excelente reparación 🧐

@manolisgledsodakis873

Жыл бұрын

"One more TV with a second opportunity thanks to this excellent repair"

@michaeldranfield7140

Жыл бұрын

Just another of the lucky ones.

Awesome, thanks for the info 👍

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching .

Thanks a lot for the tip, take care.

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching .

Thank you very much! Subscribed

I have two samsung tv of the same model. One of it the display panel is spoilt but the speakers are still working. Can I add the speakers into the other TV and in total have four speakers?

For those wondering why a "100" marking is 10 Ohms. ABC -> AB . 10^C (so C is the number of 0 you have to add to the first 2 digits) 100 -> 10 . 10^0 = 10 . 1 = 10 102 -> 10 . 10^2 = 10 . 100 = 1000 = 1k 476 -> 10 . 10^6 = 47 . 1000000 = 47000000 = 47M

@michaeldranfield7140

Жыл бұрын

I always assumed 100 was 10 plus another zero same as capacitor marking but thankyou for the explanation .

Nice catch!

@michaeldranfield7140

Жыл бұрын

Many thanks.

Good work thanks for the tip

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Quite enjoyed that video.👍👍👍

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Great Job !

A 1/16 watt resistor would be interesting to find out the switch on and running current in that little circuit a design error there !

@michaeldranfield7140

Жыл бұрын

could be built in obsolescence, a trick to ensure the set does not last too long .

@pauldavies6037

Жыл бұрын

@@michaeldranfield7140 Yes any SMD IC or transistor or resistors current ratings are too low will fail

I have a tv I changed my main board due to it wasn’t reading the controller commands when I swapped it out it was doing the commands on the remote for little while and boom it stopped working could it be the power supply?

Who knows how many TVs were thrown out just because of this faulty little resistor. I also noticed that the voltage over the 450V caps was very fluctating, is that normal ?

@michaeldranfield7140

Жыл бұрын

it should be reasonable stable , it could well be me holding the probes as well at the camera .

I have a 55 inch Samsung UN55RU8000FXZA and it has a similar failure. 1) The standby light flashes momentarily when I try to turn on the TV but there is no picture/ sound/ or backlight. 2) The 3 electrolytic caps on The Power Supply Board at the top left ( near the o/p to the main Board) have 'domed' tops. 3) When I unplug the Main Board from the Power Supply Board the Backlight turns on. 4) The Main Board does make a sound at turn on like a 'Flyback Transformer' (but only for a moment). My first thought was that the Main Board has a short that is drawing down the Power Supply & keeping the Backlight from turning on. But the other possibility is that the Power Supply Board can't source the current to the Main Board. 5) Additionally, I disconnected the 3 output cables from the Main Board & the backlight is still not lit. Have you any suggestions?

@rayfiore7779

8 ай бұрын

Bad Caps on the power supply output 470 microfarad 25Vdc

I did one of these recently with a faulty opto- coupler. Im guessing when you soldered those wires onto the resistor , it partially rectified a defect inside the resistor hence the 30 ohm reading ..iv seen heat from desoldering components temporarily "fix" internal open circuits in components before , must be the thermal expansion of the metal inside causing breaks to become bridged back together

@5pr1nk57

Жыл бұрын

Hi, can I ask if it was the same PSU as here that you found the faulty optocoupler? I currently have one of these PSUs I'm trying to repair and have no V on rails or backlights. The resister that's the culprit here reads ok and I have 15-17V from the Aux winding on the SB transformer so was beginning to suspect the optocoupler? 🤔

@reacey

Жыл бұрын

@@5pr1nk57 it was very similar to this psu. Ive done 2 the same board recently , one had a dry joint and one had a bad opto-coupler, it was reading about 300 ohm on one side of it with the probes either way round which is why i suspected it , the other optocouplers all gave similar readings in ohm mode and diode mode . Id just change them all and then you can rule it out .

@reacey

Жыл бұрын

@@5pr1nk57 after looking at this video again im sure its the same psu. I first thought the fault was the 7 pin chip on the primary because it was getting warm but nothing else was and there was no output on the secondary . Its a pwm/mosfet ic, i bought one from italy and changed it and it did the same thing which is why i started looking at the surrounding standby circuitry and optocouplers etc

@5pr1nk57

Жыл бұрын

@@reacey I've actually since found the fault! There was a small 2A ceremic fuse hidden under some gunk that was open and it revealed a short on the latter part of the primary side which was 2 Smd Mosfets on the reverse of the board so just have to pick some up now as no stock/donors here :)

@michaeldranfield7140

Жыл бұрын

It could very well be , I have found in the past many a diode that reads faulty in circuit then works perfectly after its been desoldered.

HI Michael i have samsung ue40f7000st with bn44-00632a psu board, it as low pfc 355v where shoulld i be looking for this fault, many thanks

Sometimes ,especially on some older samsung or lg sets,just resoldering the st by and main chopper transformers solves this issue.Cold solder joints can be the issue of relay clicking and no power on.

@michaeldranfield7140

Жыл бұрын

Dry joints seem to be much more common on equipment using leaded solder than it is now but yes I have had loads of Samsung in the past with dry joints on heats inked components.

Hi Michael i have a tv with the same power board. it turnes on just fine. But after i turn it off and then on again it starts clicking and wont turn on. Then you have to unplug it and wait for a day to make it turn on again. do you know what might cause this?

Great video and troubleshooting masterpiece, Michael. Thank you for sharing. Can I ask , how much time does it usually take for you to get into the right place like for example in this case?

@michaeldranfield7140

Жыл бұрын

The first time you do it it can be hours, or sometimes I look and cant find the problem and put it to one side and comeback another day , all this could be avoided if there was a service manual with schematic diagrams like there use to be years ago, now you have to look for datasheets on the internet for specific chips to set an idea of how a chip operates.

@adalbertus777

Жыл бұрын

@@michaeldranfield7140 Thank you. Priceless your are so keen to share your findings with rest of world.

hmm if 12 v at the pfc chip, and output of the transistor is 15v, that means 3v across that resistor, meaning 0.3amp through it, 0.9w dissipation , ?! no wonder it fried! did you measure the actual working voltages at the pfc chip?

@michaeldranfield7140

Жыл бұрын

I didn't measure the voltage at the chip which was a mistake but some chips have an internal zener diode on the Vcc so this may account for current draw .

nice work

@michaeldranfield7140

Жыл бұрын

Many thanks for that

I have the clicking on my samsung, the on/off light flashes 2x 5 times with a longer pause. I'm gonna follow this troubleshooting and see if I have the same issue.

A classic example of fitting underated components that sooner or later will fail. We were trained to fault find to component level, today it is just to board level which is very wasteful. What will happen when our generation has gone?

@sw6188

Жыл бұрын

Like you I was trained to component level. If we had even suggested the possibility of replacing an entire board the service manager would have fired us on the spot! These days as you say it's all about being a board jockey. Even I have had to resort to doing that, in a situation where an electrolytic capacitor had leaked onto the PCB causing the high voltage present on that cap to track over the board then start arcing then burned a large hole in the board. It was beyond repair as it was a multi-layer board, so I contacted the company and the solution - "replace the entire board". They sent me a complete replacement. I don't know what the future of electronics will be when we are gone. Very likely there won't be any servicing, people will just toss their broken appliances and buy a new one because they will be so cheap - much like how it is now, except we still have people repairing some things today.

@Barbarapape

Жыл бұрын

@@sw6188 This is the way the world of electronics has gone, and consumer electronics has been steadily turning into a throw away situation since the 80's. I can remember asking for a service manual for a Philips radio cassette to be told that there wasn't one or any parts stocked to repair it, if they failed under warranty they just replaced it. One option is to make the items self repairing, once the last of the good circuits have blown , then it item is scrapped. I first came across this technology working on the Euro Fighter, they had three backup circuits for the critical controls when i pilot reported a fault we just ran some diagnostics and replaced the faulty module, but not the faulty component. This is all paving the way for everything going AI, then no one will be needed!

@5pr1nk57

Жыл бұрын

I'm in my early 30's and like to fualt find at component level rather than just replace boards. Learning all the time! :)

@sw6188

Жыл бұрын

@@5pr1nk57 Good way to go, it will stand you well in the long term.

@Barbarapape

Жыл бұрын

@@5pr1nk57 A skill well worth having, spare boards are not always available, but components are easier to find.

Hi Michael, comments are off for the fiat 500 cluster video. Which i wanted tk say was really helpful for me. Could you please let me know what part numbers you used for equivalent replacements for the broken Surface mount LEDs. I also have a probkem with the LCD display not showing anything. If you have any info on that too would be great. 😢

@michaeldranfield7140

Жыл бұрын

I turned the comments off because I could not find the exact part number of the LED s , I got some replacement ones from RS components but they were not as high as the old ones . I had the LCD display go off on one of my fiat puntos and through youtube found a supplier in Lithuania I think it was .

Thank you for sharing this interesting and educational video with us. Please may I ask what makes the resistor increase in resistance?

@rpsmith

Жыл бұрын

Normally overheating but in this case, probably just poorly made part.

@dimitrismaster

Жыл бұрын

Many resistors fail to open circuit,but many fail to very high resistance.

On the fiat 500 led leak failure, Fiat motorhomes, same issue. Had a few in for repair, 80 quid a pop, pointer off jobs, no problem.

@CriticalThinker84

Жыл бұрын

Where in the country are you? Would be interested if you could fix a 500 cluster.

@proluxelectronics7419

Жыл бұрын

@@CriticalThinker84 North-east.

Thanks 🙏

@michaeldranfield7140

Жыл бұрын

No problem , many thanks for watching.

Thanks Michael for your videos. I have two Samsung 70 " tvs same model. Both have the same fault, main board. I usually buy parts for what I need, but unfortunately I couldn't find the matching one. My question is, are you able to fix these boards? If so is there a better way for communication? Thanks

@michaeldranfield7140

Жыл бұрын

there is no schematic diagrams for most LCD sets now so most fault finding is just a matter of luck , ideally you will need a working board to take comparisons from .

I have Samsung 85 inch tv model un85au8000 same problem ..relay on off continuously …if i remove main board then it stand on 3-5 sec then again continuous on off ..some time stand long time please give me solution

Excellent video Michael as per usual what would you say causes these resistors to fail would you say heat has a part to play?

@michaeldranfield7140

Жыл бұрын

I think the resistor fitted was far too small and there was space to fit a bigger one, I wonder if it was designed to fail in the first place.

@paulsanderson8804

Жыл бұрын

@@michaeldranfield7140 I think manufacturers should not be allowed to do these tricks shame on them

Hi Michael, Nice methodical way of finding the fault. Can you make videos on oled tv?

@michaeldranfield7140

Жыл бұрын

I have only ever had two OLED TV s in for repair and neither customer had them done due to the very high cost of new boards .

I'm a year older than you and remember reading Everyday Electronics and ETI as a great read! I have a Samsung UE32T4307AK (so a single pcb, newer gen.). I was interested if you had had one to look over yet? This one doesn't power up, but the front telltale LED is on for about 5 seconds, goes off fleetingly, then straight back on, over and over. The PFC route sounds interesting! There is 331v across the main cap. There isn't an S3050 PFC chip that I can see, but there is a 4801A chip, which does have 13v going to it. There are loads of similar, working spare boards on eBay. I think there is a lot of demand! Maybe the panels die early and these TVs get broken for spares? A briefly-borrowed pcb from an identical neighbour's TV fixes it completely. Do you know if this is a 'standard' problem, hopefully with a 'standard' easy, fix! TIA Great videos, BTW!

Just shows, experience counts! Michael, where can I buy that smd resistor selection box, and is there a capacitor version?

@michaeldranfield7140

Жыл бұрын

Yes there is a capacitor selection box also, I very much doubt you will buy one of these now though, these were produced by Phillips for repairing the G90 and G110 sets of the 1990s.

@turboslag

Жыл бұрын

@@michaeldranfield7140 That's a shame, ah well, thanks anyway Michael. Really interesting to see component level repair like this, and good that the set was saved from a premature end👍

@michaeldranfield7140

Жыл бұрын

Keep an eye on e bay with so many shops closing down you may come across one .

Hi Michael, do you think the resistor was sized for a fusible link? more than likely it was selected to shorten the life of the TV ( engineered obsolesce) Rich

@michaeldranfield7140

Жыл бұрын

Could well be built in obsolescence and deliberately designed to fail , not easy to find the first time I had this fault as there is no schematics for most sets now .

Hello Michael, I like to know you have Philip chip R storage bin (container) in video. I like to know where I can get those organized Chip Plastic Bin. Please let me know. Thank you.

@michaeldranfield7140

Жыл бұрын

Someone else asked the same question , this kit was made by Philips to aid repair of the new G90 and G110 sets of the 1990s which were one of the first sets to used SMD components , so its getting up for 30 years old now , the only place you are likely to get one of these is on the internet where someone has closed a shop and selling all the old kit off ., I also have the transistor and capacitor Philips kit .

@stevekim3922

Жыл бұрын

@@michaeldranfield7140 Wow! 30yrs Old Product. You has been keeping and clean used it. Thank you.

Cool bananas. Can u recommend a video that explains well the pfc circuit in a tv

@michaeldranfield7140

Жыл бұрын

Have a look round the internet for { Power Factor Correction } this should tell you what you need to know .

I have a Samsung that the Power Supply Control IC SPC7011F is burning Hot and something is short to ground cause i got a shock when i touched the transister aluminium cooler, damn it

I have a question about this pfc .SInce a rectified voltage is Ac X Sqr2, in our case its 230 X 1.414= 324 V dc.What boosts further the dc voltage to almost 400V DC ?

@michaeldranfield7140

Жыл бұрын

It's the power factor correction circuit that boosts up the rectified mains.

@dimitrismaster

Жыл бұрын

@michaeldranfield7140 there must be a coil for a boost converter that I did not notice.Or a winding on the main chopper?

@michaeldranfield7140

Жыл бұрын

@@dimitrismaster correct , there is an inductor .

I have a 55 inch Samsung that kept rebooting. If you disconnect the cable to the screen, it stays on. Further investigation found that on the circuit board attached to the bottom of the screen there is a 10 pin chip marked with the letter "D" on the board. I assume it's a diode pack. The chip is marked as 4268H but can't find any information on it. I removed the chip and the TV works fine without it. I'm still looking for a replacement chip as it was put there for a reason. Perhaps some kind of back EMF protection as it appears to be installed reverse polarity. Without schematics, it's difficult to be sure and I don't want to waste hours trying to reverse engineer it. If anyone knows about this chip, I would love to hear from you.

@michaeldranfield7140

Жыл бұрын

at a guess I would think its some sort of transient suppressor diode array but I think the only place you will find one is on a scrap LCD panel .

@paparoysworkshop

Жыл бұрын

@@michaeldranfield7140 You are probably right. I have salvaged other Samsung 55 inch TVs looking for it but they were different model numbers and used different components with different pin counts. 6 pin seems common but I need one with 10 pins. I'm sure they do this on purpose just to make it difficult for DYI people to make repairs. So I most likely need to find the same model number. The TV works fine without this chip, but will some stray voltage destroy something else one day if I don't replace it? Who knows!

tanx u papa

@michaeldranfield7140

Жыл бұрын

Many thanks .

Hi, Excellent video. I have Exactly the same behaviour on my Samsung TV UA55D6400UJ but when I disconnect its Main board from the Power supply board it stops clicking... So I assume The problem could be at the Motherboard?

This video is ALL the information i need for a 60 inch Samsung... but the video is blurry.. you didn't show where these components were on the other side of the board, and where that lil resistor was even located, in what area..

@michaeldranfield7140

11 ай бұрын

you have to download the datasheet for the pfc chip and then you can trace it back from there .

NICE!

@michaeldranfield7140

Жыл бұрын

Many thanks for that .

Hello I have a question i need a help from you my question is how to test logic gates on board like OR gates , and so on ?

@michaeldranfield7140

Жыл бұрын

you need a logic pulser and logic probe .

@wadib3eed7

Жыл бұрын

@@michaeldranfield7140 But it can be tested onboard without connecting the board to suppply voltage? I meen using those instruments to test like i test resistor