Yes another incredibly useful TV fault finding tip .

In this video I demonstrate how what appears to be a complex fault to find turns out to be quite simple if you just remember the golden rule of electronics. it also demonstrates how important a workshop service manual is , and without the service manual this set would have been scrapped.

[@robtitheridge9708]

life was so much easier when you could get service info.Thanks for another great video

[@michaeldranfield7140]

So right, if this wasn't an old set and I didn't have the service manual it would have been a scrapper.

[@whitesapphire5865]

Brilliant bit of deduction there! If that had been me, I almost certainly would have said, "At 1.1v (almost), that's close enough. The fault must be elsewhere". This just shows how modern electronics run to such close tolerances! If it had been a 1957 Murphy, 20volts low on HT, it would have been perfectly fine! It's a pity you're so far away - You could have had a look at my 2012 Samsung Series Five which gave up on me last week!⚡🤦💨

[@michaeldranfield7140]

I know what you mean , I repair valve radios and its common to find the old carbon resistors nearly doubled in value and the radio still works fine . Im in Derbyshire .

[@paulc9139]

The tolerances are tight these days , near enough is not good enough anymore, in some cases.

[@andygozzo72]

@@paulc9139 yep, solid state circuitry can be very picky of voltages, especially lower you go, i had a lot of troubles with a 1970s bush t22a chassis tv, couldnt get the colour decoder to work correctly, it turned out the 12v was slightly off, small adjustment and it then worked perfectly, its possible a component could have gone bad and touchy, but voltage adjustment seemed to fix it ok

[@andygozzo72]

valve stuff very 'unpicky' , even running a radio designed for 200ish ht volts on 100 ish usually works no problem , tried it , except slight loss in gain and max audio power output (as long as heater voltages are kept correct) unfortunately doesnt work as well with tvs 😉 , as for resistors, many obsess too much about replacing out of tolerance resistors, in many cases doesnt make jot of difference, except if its a potential divider for bias or screen voltage

[@twotone3070]

Interesting to note that just that small discrepancy in voltage is enough to create the fault. I don't have enough experience to know that was the fault, but thanks to you I know now.

[@michaeldranfield7140]

Wouldn't have been able to find this without the service manual .

[@paulc9139]

Michael , you have reminded me of an engineer in the shop I worked at, he could over complicate making a pot of tea, no one cared how deep in he would go into the faults, all the boss wanted was the TV to go out of the door as quickly as possible. he could drone on for hours, he was nick named the professor 😂.

[@michaeldranfield7140]

I know someone else who did the same, spent ages looking for a fault on a dead set, he asked me to have a look, I just changed a fuse and the set came on.

[@paulc9139]

@@michaeldranfield7140 Hahahaha their a breed all f their own.

[@matambale]

Thanks for getting the tripod, Michael! (And of course, for another really useful fault-finding tip)

[@michaeldranfield7140]

Got another tripod now as well £1.00 in the charity shop !

[@video99couk]

Quite on the edge that voltage. I might have replaced the regulator but would have expected it not to have got the set running again. Nice fix.

[@michaeldranfield7140]

Less than 300 mv out if I didn't have a service manual I would have thought the 1 volt was correct and this would have ended up a scrapper.

[@PoppiTrails]

Thanks Michael for the fault finding tip. Keeping it simple is a good reminder as well.

[@michaeldranfield7140]

Many thanks for watching .

[@glenmartin2437]

Thank you. A good reminder. Really helps to have a manual. Had to do repairs without schematics and a manual. That was tough.

[@michaeldranfield7140]

Yes, it's not easy, I usually start by looking up datasheets for the chips.

[@e1woqf]

Checking the voltages always comes first. This was true 30 years ago and still is.

[@michaeldranfield7140]

same rule today, unfortunately though with there been no service manuals for newer sets a lot of sets that may only have this simple fault get scrapped.

[@felixokeefe]

Thou shalt measure voltages!

[@andygozzo72]

@@felixokeefe yep, some ICs completely shut down if voltage too low,

[@TradieTrev]

Cheers for that Michael, I find the 10 year old sets are quite popular with people who are into retro gaming, they are worth fixing IMO. All the newer sets only have hdmi inputs.

[@michaeldranfield7140]

True , scart and AV inputs are a thing of the past , a lot of newer sets don't even have analogue built in anymore .

[@jasonlarnach6770]

Love your vids mate. Laughed hard when you set up the tripod, then put your hand in front of it. 😁

[@michaeldranfield7140]

I'm only filming with a camera so I can't see what the camera is recording, I am quite aware of the fact that a lot of people on KZbin are professional video makers, unfortunately I'm not one of them.

[@jasonlarnach6770]

@@michaeldranfield7140 practise makes perfect.

[@twotone3070]

@@michaeldranfield7140 Everything takes 3 times as long and it's so difficult to work round a camera. I built a small jib for my DSLR so at least I don't need to work round tripod legs and if I have it set up right I can move the camera to a new angle reasonably smoothly.

[@walker55able]

Thanks so much Michael this might help my 4 blink error LCD Sony problem your detail is so much more than i have had to date thank you

[@michaeldranfield7140]

if its an old set where a service manual is available you will need this first to see what error the code is .

[@michaelsimpson6603]

Super information, just really like you approach.

[@michaeldranfield7140]

Many thanks for that.

[@rscelectrical7091]

Excellent video Michael.

[@michaeldranfield7140]

Many thanks for that.

[@wisher21uk]

Nice fix thanks MD

[@michaeldranfield7140]

Many thanks for watching

[@xyredmax]

Hello MD Glad to see you live by the KISS principle If I had the money, I would put you in my museum as a live exhibit :)

[@michaeldranfield7140]

Thanks for watching.

[@ChrisHalden007]

Great video. Thanks Well done with the tripod. I am sure next time you will even find out how to not get your hand in the middle 🤣

[@michaeldranfield7140]

Found a different tripod now in the charity shop , its the same as the one I broke .!

[@JK-we1dr]

Nice video, thanks for sharing.. very clear and informative

[@michaeldranfield7140]

Many thanks for that .

[@ExtremeBogom]

Another great repair tip Michael, thanks.

[@michaeldranfield7140]

Many thanks for watching .

[@SecondHandDIY]

really enjoyed your fult finding

[@michaeldranfield7140]

Many thanks for watching.

[@1967deek]

Thanks for another great video

[@michaeldranfield7140]

Thankyou for watching .

[@allthegearnoidea6752]

Really interesting video enjoying watching thanks. Good service data is also really nice to have available once you checked the basics. Liked seeing you changing the chip.

[@michaeldranfield7140]

Without a service manual this would have been a scrapper unfortunately. Imagine trying to find a fault like this with no voltages to go on, this is what it's like with new sets where there is no service manual.

[@davidc6459]

Great video and great fix

[@michaeldranfield7140]

Thank you.

[@matthewgriffin4761]

Another quality video. Great fix.

[@michaeldranfield7140]

Many thanks for that.

[@Barbarapape]

Excellent piece of fault finding, with such low supply voltages, a few hundred millivolts makes all the difference. I have seen guys rebuild a circuit ony to find the power rails to be the cause of a fault. With surface mounted components, you only want to be changing the faulty ones.

[@michaeldranfield7140]

Imagine trying to find this without a workshop service manual, this set would have been scrapped.

[@Barbarapape]

@@michaeldranfield7140 I come from an era when the faults and circuits were almost the same on all brands. But today, without a service manual and a bench full of gear you have no chance. And they call this progress! They used to put warning labels saying that there were "no user replaceable parts inside" now they just want us to scrap them.

[@DannyWilliamH]

Sir, I like your channel but it should be stated that Kapton tape is not a heat shield in any way. So if removing a component with hot air near those types of capacitors, they should be shielded with some foil or aluminum tape above a layer of Kapton. It seems to have been ok here but those caps can easily explode with too much heat (it often happens during GPU repair in similar instances). I'm sure I'm not sharing anything you don't already know but viewers should know to use more than Kapton tape over sensitive areas. Keep making good videos, sir!

[@michaeldranfield7140]

No you are absolutely right I should have used tin foil as I have in the past but didn't have any at the time .

[@zs1dfr]

We were taught in our institute: "Common things occur commonly"! Don't go looking for dragons, when you should be looking for field mice!

[@michaeldranfield7140]

very good advice .

[@jackgarrison8497]

@@michaeldranfield7140 Mice are adorable

[@RetroClaire]

Good advice 🙂

[@michaeldranfield7140]

Many thanks for that.

[@walker55able]

Micheal would be really helpful for me if you could cover a 4 blink LCD issue. I was trying to read your notes for a blink issue☺

[@armunro]

Still alot of work up front getting the manual, determining the fault code, testing caps, etc. I can understand why alot of repairs are uneconomical. I still love electronics but i switched careers to IT 30 years ago just to keep a good income coming in.

[@michaeldranfield7140]

This is so true, especially where service manuals are placed on line, I would much rather go back to the old days of paper service manuals.

[@andygozzo72]

@@michaeldranfield7140 many service data impossible to get, been looking for even a partial circuit, regulator circuits, for a dead sony laptop, but data for this sort of thing rare as honest politicians 😉 i DID amazingly get a full factory manual for my early 2000s mitac one i got dirt cheap from a car boot sale, though, 😁, also could do with one for a mid 90s IBM thinkpad, and Toshiba T6400 but so far, nope 😢

[@davidbrewer7937]

Sometimes a condemned component is easier to remove if you amputate the legs before hitting it with heat... then it is easy to clean up the limbs.

[@michaeldranfield7140]

I do have a pair of £200 lindstrom cutters that would have cut between the pins as you say but then the old chip would only be fit for the bin, desoldering this way I could still re use the chip if it wasn't faulty.

[@davidbrewer7937]

@@michaeldranfield7140 I fond it useful... I would seldom consider a component which had been desoldered a wise "good" item. It has been heated up once to install, then again to remove, then again to clean pins, then again to reinstall...

[@f.k.burnham8491]

Great repair. Where did you find the jig to hold the set? I have needed one of those for many years.

[@michaeldranfield7140]

the company I bought this from closed down about 5 years ago.

[@paulc9139]

@@michaeldranfield7140 That's a nice jig, it must save you back, must be good for the large flat screens, I've seen flat panel screen been damaged because of miss handling.

[@michaeldranfield7140]

If I can get some space in here I am planning to make one myself, got a mig and couple of doors down from me it a welding shop that would sell me some steel.

[@walker55able]

This detail is what i need in order to investigate my 4 blinks. My service manual has not the same detail for Sony kdl32v4000 it suggests board replacemwnt which is not helpful. Can i ask your service manual source please thanks Michael

[@Brian-yt8fu]

I think i read that supply voltages for the micropressor are critical.

[@michaeldranfield7140]

Yes , correct .

[@robertmjr7996]

Love your videos. I have a question for you though. Where can I find service manuals for older sets? I have spent time trying to find a legitimate source online, every time I think I have one my anti virus flags it. I've been hanging onto a 10+ year old 50" toshiba in hopes of fixing it one day. Thank you for sharing your knowledge with us.

[@michaeldranfield7140]

Now that paper manuals are no longer produced the only source is the internet but there is no service manuals for the later sets,

[@joeyjennings9548]

what do you feel the chip failure was from? old age? poor quality? loss / degradation of heat sink?

[@walker55able]

Was that for 2 blinks Michael please advise

[@richarddavey9547]

After watching many of your videos I decided to dig out my Ferguson Video star FV14 (from 1987ish ) Nicam/HiFi stereo etc from the loft, any I switched it on and loaded a tape , all seemed well than it just slowly died. I had a look and discovered that CP 1 was oc so after replacing it worked again accept there is no display and the power led is dim , it all seems to work other than the display (HiFi stereo sounds great) I have all the service manuals for this machine but not necessarily the skills to understand what I'm looking for. Can you help or advice , I'm fine with a soldering iron and multimeter just need some pointers. Thanks Richard

[@michaeldranfield7140]

If you have a vaccum fluorescent display it is very common for the capacitors that generate the - 30 volt and fillement supply to dry out with heat and age causing the display to go dim, unfortunately if left in this condition for too long the VFD can go low emission and be damaged beyond repair, so replacing the caps on these two rails is an essential starting place.

[@richarddavey9547]

@@michaeldranfield7140 thanks 👍 I will take another look at the weekend , l will keep you informed.

[@jeffearle8959]

Hi Michael I have a Sharp/Hisense LC-50n4007u, it boots up to sharp logo, then shuts down. any ideas? I cant find any info on the set. Manufactured in 2020.

[@michaeldranfield7140]

Sorry I cant help as there are no service manuals for later sets the EEPROM would be a good starting point .

[@jeffearle8959]

@@michaeldranfield7140 Thanks anyways

[@andygozzo72]

very early tv 10 years old ?! blimey , all mine are 'ancient' in those terms, then 😉

[@michaeldranfield7140]

you wont get a modern tv lasting 10 years before it goes wrong .

[@andygozzo72]

@@michaeldranfield7140 my kitchen tv dates from about 2010, has had to have 2 new caps in, both same brand, popped their tops, the built in dvd player in the side failed just outside of guarantee,, i also bought several second hand ones of the same or almost same models as spares, as 'small' screen sets about 16 inch dont seem to be made anymore, two of these had internal dvd players, all dud! havent checked the caps in detail in them yet but all working, i think 2 are led backlight, others ccfl , the 'main' front room tv not sure of age, but was given to me as a dud and i was able to repair it easily, burnt dry joint on mains input connector, pcb mount iec plug! caps so far in good state

[@michaeldranfield7140]

@@andygozzo72 Sadley this is all to common these days , nothing is made with quality parts , all crap from China .

[@andygozzo72]

@@michaeldranfield7140 thing is pretty much everything is made in china, difficult to avoid it , not ALL crap though, although most certainly is,

[@Roland_Tr909_Swing]

Sets up trippd then proceeds to block the view.

[@michaeldranfield7140]

when I'm in front of the camera I cant see what its recording .