Sorry for the glare. It's not an area I usually film in, and the lighting was reflecting off the metal chassis. This was also a spontaneous unplanned video.
I didn't realise how far LCD TVs had evolved since I last looked inside one. They have been stripped back to the minimum of standard modules. Mainly the power supply and signal processor.
This means that repairing them has become a board swapping exercise. They're so standardised that salvaged and new boards cost less than the time to trace faults on the PCB itself.
This TV is my neighbour's. I'll take it back to her tomorrow, but have ordered a spare power card as a precaution. I'm not sure if it was a rogue LED issue or if the power card has an intermittent problem. It resolved itself before I could trace it.
I'm not sure I want to get involved in changing the LEDs as it looks quite an irksome job removing the screen layers and avoiding dust getting in between them.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
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I didn't realise how far LCD TVs had evolved since I last looked inside one. They have been stripped back to the minimum of standard modules. Mainly the power supply and signal processor.
This means that repairing them has become a board swapping exercise. They're so standardised that salvaged and new boards cost less than the time to trace faults on the PCB itself.
This TV is my neighbour's. I'll take it back to her tomorrow, but have ordered a spare power card as a precaution. I'm not sure if it was a rogue LED issue or if the power card has an intermittent problem. It resolved itself before I could trace it.
I'm not sure I want to get involved in changing the LEDs as it looks quite an irksome job removing the screen layers and avoiding dust getting in between them.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Integrated circuits ftw!
Whatch out Clive, Woody Allen’s Back polluting My Stream: Drain Addictt: Got him safe no Problem with Lawrence Kraus Steve
Having started on TVs with 1950s era B&W sets and gradually working my way forward from there, I too arrived at this point of things. I skipped some stuff in between, like Plasma and projection sets and similar. Scrapped a few sets that weren't worth fixing (bad panel, etc.) and those power boards can be a nice source of all sorts of stuff, including in the ones I swapped many good-sized heatsinks, lots of power semiconductors, etc. Some sets will have an additonal board, called "T-con" which contains some timing stuff for the panel, some of those have all of that built in to the power board. Stuff with flourescent tubes rather than LEDs will also be the same way, sometimes a separate board but often built in to the power board as welll Depends on the maker. What make is that one you're messing with there?
I've done a few teardowns of more modern televisions/monitors but nothing is as wonderful as opening up a CRT TV! I bought a portable radio/flashlight/tv at a thrift shop recently just so I could make an oscilloscope with it.
There's a more cost effective way to make those… it's just that industry standards in the field of innovation has stagnated over the last decade.
You can visibly just see, "there's better ways, it doesn't need this many screws, it doesn't need this thick metal backing."
The costs of these tvs was related to the failure of the screens… during production and within the warranty period… including burnt out or stuck on pixels
Technology is of course amazing, but there are weak points – screen has very weak extensions connection – flex tape is glued to the edge with special machinery. These connections are tend to oxidise causing vertical black lines to appear on the screen. They can be removed only by professional service – so if you're out of guarantee – in most cases it will be cheaper to buy new TV then repair old one.
I think that mentioned above oxidation in most cases is caused by users – when they clean the screens spraying window cleaner on it. On another hand, I've never seen vertical lines on PC monitors or laptops – so they must be built better, because I don't believe that laptops and PC monitors are treated better than TVs.
Another important thing – scam.
Time to time media are debating about fake IPhones etc. In lied care of users – they fool people that with fake products users can't get proper quality and support. Maybe this is true, but Apple market is much smaller than TV market. So, why they don't talk about fake TVs – that are simply everywhere?
If I buy JVC TV I expect that TV is designed by JVC and is produced by JVC as I trusted this brand.
Nope – this is all Vestel, and JVC has nothing to deal with it. Thing is that JVC denies any support for users and Vestel also denies they are responsible for anything. So in fact – only guarantor is the shop that sold you that TV.
The only reason that media are quiet about that is that brand owner gave permission to use the brand on those products. But from customer point of view – they are all scammers and even worse – the brand owner taking a part in that scam.
Do you really think So Clive
Quite the change from the tube tvs that we repaired back in our day… They didn't even follow Ohm's Law, it was Sony's Law or Motorola's Law Etc!! Michael in Colorado.
Yes, That’s a bit like taking the TV Apart too see if there really are little people living inside it and asking them what programs are on
You might try some heat and cool tests. A hair dryer on it while it's running to simulate a hot condition. An air can turned upside down to simulate a cold condition.
That was two years ago. There's even less in the buggers now! Just two farting little PCBs!
I replaced the power board in my neighbors TV about a year ago and it looked identical to that one.
I wonder if you've got the same model TV there or if that same board is used in multiple brands/models of TV.
If your a sim racer there's lots of goodies inside. 😉
Vestel are using the same power supply board throughout. Lower power ones have a SMD switching transistor on the solder side of the board. Higher power ones have a leaded device fitted on the top of the board. If you look at the underside of the board, you will see bunches of SMD resistors in series / parallel combinations which is related to power rating of the board and size of the television. Interestingly the switching transformer does not change IE it's the same size for a small TV or a large TV. One big fault with them is the additional back light circuit you point out in the video. If the backlight LED's fail, the voltage on those electrolytics goes sky high. They have the ability to fit one, two or three rectifier diodes to the outputs depending on the power requirements of the board, but, in all the ones I have seen, they have fitted all three, even in a low power version. The control chip for the back light circuit has the ability to monitor the current in several banks of back light LED's, so if one fails it can compensate. For some reason they bypass this feature. All in all, it seems to be a universal power supply board that can be easily modified in production to suit the TV it is going to power up, by adding or removing components. It is not as good as it could be.
As an aside, it's well worth taking a look through Michael Dranfield's extensive back catalogue of videos. He must have tackled just about every fault that occurs in Vestel TVs.