Quick and simple for you and great for the viewers

@michaeldranfield7140

10 ай бұрын

and a quick money maker too !

I worked in a place that wound most of their own cores for telephone exchange equipment from small pc board sized coils to more common 5-10 pound transformers to massive 400 pound transmitter end transformes, the handling of the wire from start to finish is a factor. In one case we traced multiple bad pc sized coils to the simple fact that one of the winder ladies was hooking the tails of the enamelled wire behind a metal weight, resulted in the wires getting abraded in a location that fortuneatly the hipot test caught before it went out. Construction prints where often updated to add a layer of nomex paper in locations that proved vulnerable. Quite the eye opener as a newbie to the world of tranformer manufacturing. But even something as simple as loading a new spool of wire could cause problems if the loader is careless. Enamel is tough, but given the right circumstances a bit of abrasion, a crack can cause issues. For this coil, the first place we'd be looking at is the mechanical assembly of the coil and plastic holder, is it getting forced into that space causing a mechanical compromise of the enamel? In a hand assembled situation is an assembler or assemblers using that little plastic nub as some sort of lever point? Excessive force to get it in there? And yes, we can't discount the potting material considering the origin of these things if it fits it ships mentality allows for non-spec potting compound to be used.

@andymartin86

10 ай бұрын

Interesting insight 👍

@michaeldranfield7140

10 ай бұрын

very interesting and the fact I have seen this before in these sets would suggest as you say some sort of manufacturing problem .

@alexb.1320

10 ай бұрын

@@michaeldranfield7140 If the failure is occuring at the same location, I'd put it to a manufacturing/assembly induced fault. If its something happening at randomn locations on the coil then we can chaulk it up to barely adequate enamels that breakdown too easily, and with the nature of todays consumer electronics, build it just good enough to last through warranty doesn't help in material choices.

Yet another interesting and educational video - thank you for sharing it with us.

@michaeldranfield7140

10 ай бұрын

No problem , and thanks for watching .

Very useful information, these Vestel chassis are used in a lot of low end sets. At least the parts are available rather than having to replace the whole board. These sets are made down to a price, my guess is that the insulating varnish was too thin on the copper wire, if it is copper! Buy cheap repair many times.

@michaeldranfield7140

10 ай бұрын

spare part availability for Vestel is very good , where as some sets , UMC, dont supply any spare parts, I have always liked Vestel , even from there CRT days , designs are very basic and most of the time circuitry is just lifted straight from the chip manufactures datasheets .

@dimitrismaster

10 ай бұрын

@@michaeldranfield7140 if only they would make firmware dumps and updates available...

@interstat2222

10 ай бұрын

UMC bought the boards in from Chinese OEM board provider CVTE and often the TVs were made from kits by another Chinese OEM only brand, Shenzhen MTC, which has links to Chinese appliance company Haier. They were also based on Taiwanese MediaTek reference designs as far as I can tell. I don’t think they were too bad. Very small companies.

@Barbarapape

10 ай бұрын

From what Michael has said UMC don't supply any spares so repairing them requires you to go to component level if you can find a supplier for the faulty parts. You can quickly run up a repairr cost that the customer will refuse to pay. I have been there many times, so these days i refuse to work on them.@@interstat2222

This man is brilliant I wish he work with me in the 80s at rediffusion

@michaeldranfield7140

10 ай бұрын

I would go back to the 80 s any day when sets were built to be repaired .

Well found, have a nice day.

@michaeldranfield7140

10 ай бұрын

Many thanks .

thank you again Michael good video and great tip😊

@michaeldranfield7140

10 ай бұрын

Many thanks for that and for watching .

my new Toshiba TV is a Vestel . They must make millions of TV every day. I kept my old plasma TV as a back up, it still works

@michaeldranfield7140

10 ай бұрын

These was a documentary on the vestel mega factory I saw on the net quite a while ago and they were making something like 47,000 sets a day back then , it could well be millions now .

@leetucker9938

10 ай бұрын

@@michaeldranfield7140 NatGeo Megafactories VESTEL ENG . its the size of a small city , wow

@interstat2222

10 ай бұрын

Vestel is UK’s market leader and has been for some time. They have Toshiba license for a few years still. Also make small appliances and many white goods for the in store brands mostly. White goods quality equal to Beko.

It’s a vestel anything can happen 😁 I’ve had to fully recap a couple of these units, failed primary’s and outputs

@michaeldranfield7140

10 ай бұрын

Too right , literally anything .

@dimitrismaster

10 ай бұрын

Why recap?Did you measure the caps with an esr meter or did the osciloscope showed extensive ripple?Most Vestels use "Elite" caps,a decent brand.not Japanese,but not the crappy quality most manufacturers like lg or Samsung use

@interstat2222

10 ай бұрын

Elite is a good Taiwanese brand and used by Dell but Vestel have had to cut costs due to Turkish economy and switched to a Chinese brand, Koshin. I don’t know if they’re any good (maybe they are) but never seen them in electronics before and only Vestel uses them. Even Panasonic is using Chinese OEM power boards now. Sony is still using Japanese caps.

You called out the adhesive as causing damage sometimes. I thought the coils were slathered in epoxy to prevent the turns from rubbing against each other as the line current tried to make the coil buzz.

@michaeldranfield7140

10 ай бұрын

There was a set quite a few years ago, can't remember the model but it was a 15 inch with built in dvd player where the mains filter choke was faulty in every set you got in for repair and the reason was during manifacture the choke would be covered in hydroscopic glue which eventually eats away at the enamel of the copper wire causing shorted turns, visual inspection would reveal the copper wire had gone green due to moisture, but in the vestel no glue products are on the copper wire so it's quite bizarre why this has failed in this way.

@tactileslut

10 ай бұрын

@@michaeldranfield7140 Fun with chemistry and unintended consequences. Thank you.

So easy when you know how, isn't it Michael? I reckon I'd still be searching for the fault long after Countdown finished.. :-)

@michaeldranfield7140

10 ай бұрын

had this same fault a few times now .

Great video Michael I was thinking did the choke fail before the back-lights on that tv ..

@michaeldranfield7140

10 ай бұрын

This is an edge lit set and for some reason , maybe its because the LED s are mounted on a thick aluminium heatsink , I find the backlight are far more reliable and well outlast back lit LED displays .

yep a ac mains spark would cause the fuse to blow bad insulation in the choke heat maybe power surged (inductance killed the fuse)?

Last week I repaired an ultrasonic bath with a blown line filter choke. I just desoldered it and since I didn't had a replacement I just put in two pieces of wire instead. Besides the lack of the filtering function without the choke, could there arise any problems (besides EMI)?

@michaeldranfield7140

10 ай бұрын

Dont think it would create any problems apart from noise from switching transients in the chopper power supply appearing on the mains supply.

@dimitrismaster

10 ай бұрын

Well chokes are placed to filter input line noise,and output neutral noise.If there are 2 chokes, one for input one for output,at least leave the one in place .

Hi Michael Thank you for the Video. I just found it since my power board was killed yesterday. As it seems my fuse is still fine as well as the LF2, which you replaced. Do you know if the LF1 is the same part? In my case the LF1 has a very high Resistance, while it doesn't smell or look bad. (At least from the top view) Do you have any suggestion for me? Thank you very much in advance. Best, Matt

@mattse2209

6 ай бұрын

I got my TV working again. I shorted the LF1, which I know is not a good idea. The problem is just that in Germany those spareparts are not available. If I want to change it, I would have to order a whole PCB or order it from abroad. Thus it was the easiest way for me to see and test if it still works.😅 I won't keep it shorted, its just a "hotfix" to check if that was really the fault, why my TV was dead!

Great upload. May I ask where you got the schematic for this board and other please?

@michaeldranfield7140

9 ай бұрын

I got it from ASWO my component supplier , the vestel website has never had any new service manuals uploaded for years now

@brianjames6890

9 ай бұрын

@@michaeldranfield7140 Thanks for your reply., Michael.

after my tv had no power at all i did try to find issue with my Vestel 17IPS71 board but i couldnt seem to find it, after replacing the board i then had power but upon pressing the power button the led on the front flashed slowly from red to green as normal power on cycle but then began flashing rapidly from red to green and nothing on the display, do you have any ideas?

@michaeldranfield7140

2 ай бұрын

The fault you describe use to be very common on some Toshiba sets and it was caused by bad software in the SPI chip on the main board , however if your board is not a brand new one it would be a good idea to check all the output voltages are correct and that you have fitted the exact version of the 17IPS 71 as there are hundreds of them , you need to order the board using the part numbers on the board and not just by 17ips71 .

@DJMills

2 ай бұрын

@@michaeldranfield7140 yeh I think I bought the wrong one my bad, thanks

@michaeldranfield7140

2 ай бұрын

@@DJMills have a look on the board for a big number , this is the one you need to match up .

Hi Michael, is there any way I can contact you to ask for some advice please?

@michaeldranfield7140

10 ай бұрын

e mail me on md@digifixltd.co.uk, but I seem to be having delayed mail at the moment.

@allen5976

10 ай бұрын

Brilliant, thank you

@michaeldranfield7140

10 ай бұрын

@@allen5976 I have tried to email you twice but my e mail keeps bouncing back and it says it cant be delivered ??

Think Vestel is the biggest tv manufacturer in the world ? Certainly all the brands we used to know in Uk as japanese Toshiba, Jvc, Hitachi ,Panasonic are now turkish delights . Will be looking at the next vestel power supply i see now .👍

@dimitrismaster

10 ай бұрын

Philips is also vestel.There are a few expensive panasonics that aren't vestel,made by the real panasonic.

@jasejj

10 ай бұрын

​​@@dimitrismasterPhilips is not Vestel. The brand is owned by TPV, a company part-owned by the Chinese state. I'd far rather have a Vestel! JVC isn't really Vestel anymore either. The brand is licenced to Currys who use a number of OEMs, commonly Konka these days who are also a Chinese special (and again inferior to Vestel).

@interstat2222

10 ай бұрын

Biggest in UK or Europe. Philips at one time had a few low end Vestels (about a decade ago) but not anymore as Philips TV/electronics division handed over to a Hong Kong/Taiwan company (TPV) with 50+ years experience in 2012. They took on Philips staff.

@interstat2222

10 ай бұрын

Not every Panasonic. Just the lower models. But they obviously meet Panasonics standards. Lots of white goods from Vestel in UK too.

Can't be common, never seen that happen and have seen 100s of Vestel PSUs. I'm quite sceptical, line filter can blow a fuse only when there's a path between coil sides.

@michaeldranfield7140

10 ай бұрын

Its quite bizarre I know but I have had this exact same fault a few times now .

@interstat2222

10 ай бұрын

Could it be due to user conditions. Eg sun beating down on it in a window or above a fireplace?

common mode inductor bad copper

@michaeldranfield7140

10 ай бұрын

no doubt Chinese copper.

That does not make any sense - that's just a CM noise suppression choke, to stop the switching noise back-feeding into the mains. As far as the 50hz is concerned is just a piece of wire ! Shorted turns on that would not blow a fuse.

@michaeldranfield7140

10 ай бұрын

it is quite bizzare I agree but its a fault I have had a few times now .

@dimitrismaster

10 ай бұрын

Maybe the way it's damaged,it creates sparks,that's why fuse died like the hero it is.

@Tegelane5

10 ай бұрын

Short between turns is not the case ofcourse but I think it shorted through ferrite core. At one side isolation failed and ferrite core became live, and then isolation completely failed at otherside as well, creating conductive path between live and neutral. 1:04 it seams that left side of upper coil is discoloured and under side coil of course is clearly seen blown.

Countdown? Is that still going?

@michaeldranfield7140

10 ай бұрын

Yes , I only made this video last week .