How standardized a lcd panels? Could I replace the controller in a smart TV with one of these HDMI to LCD controllers?
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LCDs do tend to speak somewhat standardised languages, but there is a lot more to a modern TV than just an LCD controller.
Color and white balance calibration, image/motion processing, HDR Processing, backlight control/dimming zones, input management, audio decoding/encoding/passthrough, digitizing analogue sources, HDMI licencing, Dolby licencing, etc.
If you want a better smart TV the best thing to do is to get a hackable TV like most android based models, replace the launcher, strip out system apps and telemetry with ADB and start fresh, then either leave it offline or use filtering to only allow access to the services you approve.
I have rematched controllers to displays in the past. It’s neither simple nor easy. You’ll need to dig through spec sheets to ensure you’re sending the correct signals over the correct pinouts, at the correct frequencies and voltages. Be prepared to read some IO documentation for the sending and receiving chipsts, then verify pinouts with certainty. They are not always standard.
Here are 2 identical LCDs, with 2 very similar, nearly identical looking controllers. Note that one needed to be re-wired. It is not fun butt-connecting 2 dozen 28ga wires.
Why did you do it?
I was a poor college student and had access to engineering samples from a local manufacturer. Discarded parts gave me twin 15" LCDs for free in the mid 00’s. Also, to see if I could. It was a fun challenge. These are different revs of a controller that were outfitted in several slot machine prototypes. They gave me many years of service. I probably still have inkjet prints of the pinout and signal diagrams, somewhere.
Seems like a fun project to me too. It also seems like things have changed since the turn of the century, with regards to interoperability.
Oh, things are way better now than they were back then. I’d still confirm via documentation that the interfaces are compatible :)
I retired from embedded systems design and design-for-manufacture a decade ago. Reading datasheets was most of the job. This doesn’t look too daunting. It’s a single interface between two readymade components. I’ve identified where some issues might come up, and there are probably some that I don’t know about yet. Still this seems less like building a circuit around existing ASICs and more like hooking up stereo equipment to me.
The in-rush of endorphins when the modded LCD thing actually worked probably knocked you out?
A bit of a side story: I disassemble probably 1–5 panels in a week. (For recycling, it takes about 20-45min per panel.) The flat cables alone are so flimsy, I would say just assembling a display again from known, matched and functional parts would take days. I would triple or quadruple that to assemble a display from random parts. Considering this, that modded panel is quite amazing to me.
In standalone panels, the PSU has a chance of killing you: the main capacitors can hold multiple joules worth of nope, charged to about 400v. So, if the main caps are not allowed to discharge (if they discharge at all that is), there is a possibility of death when disassembling a panel with an integrated PSU. Waiting “5min” is bad; a PSU needs to be unplugged for a day or two at least before the charge drains out.
I think it depends on what level the smart aspect is implemented and how integrated it is. Screen technology has been getting more and more locked down by corporate privateers/thieves.
I mostly tried hacking on small displays, and finally gave up as it was over my head. There is a whole lot going on in various layers and protocols. My rule would be to only buy a product like this if I can find a functional example of someone using my exact hardware with this exact hack in question.
In my experience, prototyping or hacking around with displays is a losing game because they are not constructed for handling like this. You must go to extremes to avoid placing strain on the flex ribbon connections and must be very careful about taking the thing apart to test with it disassembled. It only takes a tiny mistake to damage something that can not be repaired. They are usually sensitive to small nonsense too. These are fast parallel circuits. I stay away from them, but maybe I’m just being soft.
In short, this is one of those questions where if you have to ask the answer is no. It may be possible but unless you have a spare TV laying around that you don’t mind breaking it’s not a good idea to try. The best advice I have for any modder is to have multiples of whatever you’re modifying on hand.
2 is 1, 1 is none.
I can think of no better use for a TV
Well you could not connect it to the internet…
I’ve always wondered this, figure this is the thread to ask it.
I’ve been using the same dumb TV since 2013 it’s great, but eventually it’s gonna die an I’m scared of what pieces of shit smart TV’s are.
Could I not just use a computer and run it through the smart TV and bypass all the smart bullshit by using it as a monitor?
I have a Hisense and a LG and I never connected them to WiFi. I have not had any issues
My experience with LG/WebOS has been fine if I don’t try to get online. It doesn’t pester me to do so.
I have a WebOS TV and I absolutely hate how slow it is. Turning on takes a long time. Selecting apps takes a long time. Flipping channels takes a long time. Did we forget how fast TVs from the 90s were??
To be fair, TVs from the 90s didn’t have apps, and I don’t actually use the apps on my LG, so it seems fine.
For older LG webos TVs, the delay between button push and action in the settings app can get as bad as 4 seconds.
The reason I bought it:
- Samsung pushed ads agressively on their TVs
- I had an HP tablet with webOS before and wondered what LG did with it after taking over the development. I was horrified.
The hardware is not much better. There’s constantly something wrong. But the LCD panel is pretty decent, so I just patch it up every time, rather than throwing it out.
In Spanish “WebOS” sounds exactly as if you were saying “huebos” which is slang for testicles.
Just a tidbit for your day to go just that much faster.
Some smart TVs require you to connect them to the Internet before you can even use them with HDMI. It’s a changing world. This post has a lot of interesting comments.
Provide the citation please because the last one you mentioned to me was about a return that you heard about while standing in line at Wal-Mart about a rok/tcl tv, which btw which you don’t need to do any of that to use it.
https://support.tcl.com/ca-gtv-setup-configuration/how-to-bypass-tcl-account-creation
oh and
This makes me want to look at TCL TVs more closely. Thanks.
I would immediately return that crap to the store.
Where I first caught wind of this was in the return line at Walmart where a guy was returning a smart TV because he wanted to hook up to his Dish receiver and couldn’t without creating an account.
Every one I have encountered only requires that for use of the smart TV features. And if you have one that requires Internet just to use HDMI to connect to a device, your TV is 100% spying on you and you should return it.
I don’t buy TVs but I quized the guy pretty heavily thinking that was an option. He seemed to know what he was talking about about. This was an Onn Roku TV.
BestBuy brand Insignia offers non-smart TVs.
I’ve got a crappy Samsung knockoff with its own shit version of android that constantly switches inputs on its own and tries to load the home screen all the time. When the Xbox or PS5 is plugged in it will do that, when it’s HDMI into the laptop it doesn’t so YMMV but you should be ok.
Apropos of your first sentence, I have an odd question for anyone. The tv updated itself and now will try to turn off every hour or so due to some android power save, while I’m playing a game. I have to use the actual tv remote instead of the receiver which runs the inputs and volume. Can’t figure out how to turn that off, help!
Also, fuckin fantastic name Mr President. You and my cousin should hang out
Just don’t connect it to your wifi. Any TV that has cell service antenna, like most cars now, just don’t buy those.
No.
Smart TV’s run automatic content detection on all their inputs. You will also be nagged to put the device online relentlessly, and some models will not let you skip internet connectivity.
Which manufacturers specifically will do this? Other comments seem to think LG is ok. Genuinely curious if anyone has experience.
Someone should make a wall of shame for the worst offenders.
I wish I knew, but the ad industry LOVES this tech: https://duckduckgo.com/?q=smart+tv+ACR&t=ffab&ia=web Every other result is “How ACR is going to be awesome for advertisers/marketers”. the ones in between are “How to shut off ACR” :-/
I’ve been using a Visio smart tv and a Fire smart tv, well smart for it’s time at least, and I’ve never had any issues with it since it’s never been connected to a network.
Why go through all of that when you can just block network access, or not even connect it at all? Hell, just get a Blocklist that includes the bad URLs for your TV you don’t want it using, and run it on AdGuard or Pihole. Lots of easier ways to work around this.
Unfortunately some TVs pester you when they can’t get internet access, or will even attempt to connect to any open WiFi networks in range.
Some have offline ads or can’t boot straight to an input, too.
Then there’s Amazon trialing having Amazon-powered TVs automatically connecting to any Alexa devices and using them to gain internet access.
I’m not saying OPs suggestion is the best one, for most TVs, what you suggest works very well. But it’s good to have more options, particularly as the market continues to get more and more locked-down.
Even aside from all that, if you could replace the controller board, that would open up other possibilities - potentially adding DisplayPort to a TV, for example. Or retrofitting FreeSync if the panel supports it. Or even just plain TV repair without having to pay through the nose for a part you can only get from Samsung/LG/Sony/etc.
Just not feasible though. Smart TVs have everything in an integrated line, from the screen controller, down to the external ports. It’s like saying “Hey, I just want to take the North Bridge out of my motherboard because I don’t use the features”. Not gonna happen.
Now, in an alternate universe, if somebody went down this route and made replacement parts to remove all the cruft, you’d essentially be buying an entire new TV. There is no cost savings there. Buy a monitor, and hook up whatever smart shit you want at that point.
I would be interested in trying this but could I just lock everything except Netflix & Disney? Or have it one way and Keep my streaming but not have anything go from my tv back out?
AdGuard has click-to-block service blacklists. Super easy. Just block everything you don’t want, and keep what you do. Should get you 95% coverage.
Why go through all of that when you can just connect the board to the panel.
Why go through all that when you can just build a time machine and go back in time to be in the boardroom when someone presents the concept for a smart TV and then hide under the podium and tickle their genitals to distract them during the presentation and then spend the next 20 years in prison for sexual assault where none of the televisions have smart features?
Then once you get out you can just buy a “commercial display” and not have to go through all that because there’s no smort features to begin with.
So, “yes”, but also no. You’ll lose the calibration panel for your display, and the result will probably be unwatchable.
You’re much better off buying a display which is un-smart to start with. These are often called “commercial displays”. Or of course you could just buy a monitor.
Or I could just accept my place and watch the ads and go along with all the caveats like a good consumer. I don’t see that happening.
My Vizio smart TV’s smart features won’t work if you don’t accept the terms of use. HDMI inputs worked though, and probably TV tuner… didnt try it. I eventually accepted of course, but that might be an option for you.
huh i wonder, if the answer is “yes” or “somewhat yes” is it a valid alternative to replacing the power supply in my tv?
i got one for free with a busted psu, but the power supply board is extremely rare (i only ever saw two listings of it, one on AliExpress and one on ebay, both just one piece left and for higher price than a new used tv; similar boards are like 5 times cheaper)
basically, unless i could find an alternative solution like that, I’m throwing it awayWhy not disassemble it and sell all the working parts, if they are rare and expensive?
This comment reminds me of an episode of Pawn Stars when the son bought a very rare and expensive bike to fix up. The dad gave him hell saying if the bike is so rare and expensive, where are they going to get parts!?
I think you will need a power supply for your panel in addition to a driver board like this. This only provides the signals needed to switch the pixels but not the power to drive them. Some of these include backlight drivers but even then I think you would probably need more current for a TV than these provide.
reminds me of this video that shows how they reverse engineered the macbook touchbar display and made their own driver. I bet a tv is harder, but I’ve wondered the same thing, and would be interested to see someone try.
Great info. I think the screen is easier. Thanks for this.
So if anyone is interested I found the answer to my question. There seems to be two standards for LCD panels and there are these cheap converters for both of them.
There are some amazing projectors available these days and they don’t seem to be crippled by smartification. There are some cool homebuilt projectors that are made of bright light sources and old cell phone screens to, if you want to learn.
Alternatively, you could also get a 40+” monitor. Avoid Samsung, because nowadays they are really pushing their spyware everywhere, including displays. Some other brands should be fine though.
Haven’t taken any TVs apart yet, but this lookes like it could totally work on a laptop lcd panel
They are made for laptops, and I am sure they work there. There was a post here about 15days ago asking about unsmarting TVs but it has been deleted. That got me thinking about this solution.
Those boards you find on ebay are for driving laptop and tablet displays, not TVs. I doubt there is going to be an eDP or DSI connector in a TV.
The best options are to just never connect a TV to the internet, use a large computer monitor, or buy a commercial display if you don’t care about picture quality.
I don’t think this is edp or dsi out. Seems to be parallel 50 pin
Parallel RGB is typically only used on low resolution displays. It’s not practical to run a parallel TTL level interface at the speeds needed for HD.
Yeah, I am definitely going to open up my $400 tv and replace the LCD controller with this sketchy piece of hardware instead of, checks notes, just not activating any of the smart features and not connecting the TV to the internet at all.
Until you get a Roku where you literally can’t use the TV without accepting an arbitration clause.
Here’s an idea for you, don’t buy a Roku TV. Visio is pretty much the exact same price and you can just not use the smart features and just connect HDMI.
Yeah but what if you already had one. Or bought one without knowing it’d pull a fast one on you.
“Here’s an idea for you; how about being aware of every single company you might interact with and all the shitty ways they try to screw you over.”
That’s a little crass, but I hope you understand my sentiment.
Also how can such arbitration clauses be both legal and binding, I don’t understand it.
Did you know: you can look up a review of any piece of hardware out there that you wish to buy and gather info on it before making a purchase.
I love looking up reviews for every little thing I purchase, and even when I do ads nor microtransactions ever get patched in at a later date! Same goes for those service agreements which aren’t ever updated!
Oh, wait, no. That’s exactly what happens.
Nor do I want people who aren’t as tech savvy/in the know to get preyed upon/swindled.If you are incapable of sussing out the mindless morons who write reviews from the people who actually know what they’re doing that’s more of a you problem than anything else.
And buying a TV is not a little purchase unless you’re incredibly rich in which case why would you even fucking care. But hey, if you like rolling the dice on your hard-earned money to buy something that’s not going to work the way you want it to and then break it trying to “fix” it with some sketchy hardware from some rando online who thinks they’re “in the know” be…my…guest.
This is such a stupid argument. Not everyone is tech-literate. Ideally people wouldn’t have to look out for this because the practice wouldn’t exist. “Just don’t get robbed/swindled lol, you should’ve known better”.
And no, I’m not trying to advocate for whatever sketchy device is linked above. What I am saying is that I understand the sentiment, because that manufacturers are increasingly encroaching on our ability to own what we buy with parts pairing and always online requirements.
You are an Eloi not a Morlock.
It depends on the TV.
