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- Опубліковано 16 вер 2024
- Dave finds a 65" 4K UHD LG LCD TV in the dumpster!
Will it work?
Bonus teardown included.
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I found a 2014 vintage 55" Samsung 4K set at the recycling center about a year ago. We took it apart, found one single dry solder joint in the power supply that actually arced at some point. Once we reflowed that joint, it fired right up. It's been my main living room TV since then. Can't beat free!
Raunchy.
Jamie Richard
At my local council recycling centre, they won't even sell stuff to the people who pay the Council Tax to run it. :(
Vintage really
I have one of those to be thrown out. The screen is broken and its 5k for a replacement! If you need electreonics out of it let me know. Everything on it works minus the giant crack in the screen,
You should try and send him the main board for mailbag so he can just drop it and get it going.
Maybe Dave could send you his screen -- hahahaha
But seriously, if you do send Dave your electronics, maybe throw in the remote too :-)
$5K ?! WTF
Where are you based? Happy to pay for postage for the main PCB.
If you're going to put PCBs in a box, maybe best include all of them? It'd be a bummer if it turned out that the fault was actually on the power supply board after all!
You said 4K screen, but is it an OLED? The interface looks very similar to a 55" 2018 model I just bought, though no popup webcam or control paddle on mine.
Dave -- just in case you didn't try it -- those different HDMI inputs may be handled by different processors, so try all of them. According to the manual, HDMI-3 is the one intended for use with 4:4:4 or 4:2:2 at 50/60Hz-4K, while the others are not. (And for 4K you definitely need a cable intended for 4K). I realize you were testing it on 1080p, but regardless the different HDMI inputs may route through different chips.
Very good idea. ;)
As you say, some formats bypass some scaler chips, and are sometimes even routed to the TCON directly (due to the high data rates for 4K).
Nowadays, even the basic OSD stuff might be handled on the TCON itself, although obviously it's very doubtful here that the TCON has a fault.
The PC and Rasp Pi will be outputting 4:4:4 RGB normally, of course, but yeah, 4:2:2 from a cable box or something is worth a quick test, especially if it's 480p / 576p.
My hunch is a bad BGA joint between the HDMI input chip and some DDR RAM, or just a failed framebuffer RAM, as they can get quite toasty.
(it's just as likely all of the scaling stuff is handled on the main SoC, like a lot of 4K TVs these days, but possibly with separate RAM for the input framebuffer.)
There is some semblance of an image, though, and it's good that it does power up and detect the input format (and audio) just fine, so it definitely seems to be a scaler issue rather than the HDMI input side.
I did try all of them.
IC3200 handles all HDMI inputs. It is a Panasonic chip.
Man, you are the luckiest dude in the entire universe.
Your dumpster finds are the stuff of fantasy.
My fantasy anyway.
Your lab is like my house. I have to clean it up/out but I just love 'stuff' so much.
If I had your dumpster access I would be doomed.
That wasn't a dumpster it was a storage room Dave just stole someone's TV :)
Your not funny. Please stop trying and accept it!
@@Dust599 I found that funny please stop telling people what to do and accept it!
@@Dust599 *You're
This was funny. Maybe it was just Dave's TV that broke and now he is making episode out of fixing own TV :D
Peter Ellens this was funny ... and it explains alot 😂
Not just 4k, that's actually a 3D capable (FPR) TV; hence the 200hz on the panel. Amazing find.
Argh, 3D, back to the dumpster room it goes.
What's wrong with the 3D goodness?
@Dave: It s a feature not a must.
And yes l know you were kidding. 😘
@@ElliottVeares - Home 3D has been dead in the water for essentially a few years now, but there's still a small number of fans. Even passive 3D like this LG are underwhelming (my brother had an active 3D and it was so bad)... you're sacrificing picture quality for a novelty that isn't even as gimmicky as what theaters offer. Big picture 3D movies at the box office have also been in decline for a while, with the margins against their 2D showings dwindling. Finding an older 3D capable TV doesn't hurt anything, and you never have to use it. In fact, you can probably get your hands on a 3D Blu-ray player and used 3D movies for quite cheap, just to give it a whirl.
Dang, that must have cost a pretty penny when new. Especially in 2014!
Bad solder joints on the main scaler chip (BGA of course). A bit of flux and reflow and she'll be all right again :) Broken BGA-joints on flatscreen TV's are totally "normal" when they fail.
Datz was enough to kick it and it works.
@eevblog try a repair!
It's all about Balls !
@RavetcoFX it's not a flip chip. It's not the high lead bumps at fail here, it's the actual solder balls under the chip
can you reflow solder balls? I thought it needs a full reballing
One man's trash is a David Jones EEVblog video....
Rather than do your 'follow the voltage' routine it may be time to step back from the electrical level. Many modern displays are ARM processor based and have a user accessible boot monitor. If so, the board will have a set of 3 or 4 pads (or a connector, maybe labelled Tx, Rx and GND and VCC) to which you can attach an FTDI based UART to USB adapter (with a scope you can work out the baud rate, most likely 115200). Via a terminal emulator you can interrupt the TV boot process by hitting ctrl-C. Once in the monitor typing a ? will give you the available commands (sometimes there are test commands for isolating problems). The peripheral chips will most likely be I2C based and the boot monitor I2C sub-commands will let you talk to them. Anyway, it's an opportunity to demonstrate fault finding from a different angle.
yeah we're sick of this voltage crap we're not 12 anymore
i'd reflow the hdmi chip, hell the board is free.
Does Dave have a reflow heat gun?
The serial commands (not the low levels ones though) are in the manual, I was going to give that a try. Voltage checks are basic and take seconds to do.
@@EEVblog
I cannot fault the efficacy of your initial analysis. I'm just suggesting that now you've verified the SoC system is running, let's leverage the power of the CPU to our advantage.
LOL! It's absolutely amazing what people throw out in that building!!!! I am guessing bad BGA connection on one of those chips covered, but maybe the chip that connects straight to the HDMI ports took an ESD zap or something. I do know that connecting HDMI cables up whilst powered can kill chips on occasion - happens a lot in PS4s and XB1s. I hope you get time to look at this at some point!
And this is why I sigh when I see certain products with no ESD protection on the HDMI ports at all.
Obviously those newer consoles do have ESD clamp diodes (either in the HDMI chip or external), but it shows that even those still get zapped quite often.
I'm talking more about specific boards that hook up an HDMI port directly to FPGA pins etc., and those definitely don't have full ESD protection beyond the usual IO clamps.
And it's often not "static" itself that's zapping the chips, but that voltage difference you get between two SMPS-based devices, or say an Earthed PC and a monitor.
Without the requisite extra ESD clamp diodes, some of those devices are just waiting to be zapped. And, as you said, it happens sometimes even *with* the diodes, so best to power down the console before connecting cables.
#ESDrant lol
But yeah, I agree that the fault on this TV might be a cracked BGA joint, or some bad RAM maybe. Could still be a bad core supply or something, of course.
It looks as though it's at least trying to write the pixel data to the DDR RAMs, and obviously the scaler chip is detecting the input format (and even the PCM audio), so I reckon the problem could be the signal path between the scaler chip and RAMs, a bad RAM chip, or dodgy supply there.
The OSD is probably handled directly by the "Smart TV" SoC, and uses its main RAM for the OSD buffer.
It might even be the connection between the HDMI input chip and the ARM SoC itself, or noise or an LVDS / TMDS link maybe?
I still can't believe people throw out stuff like that. I don't even have a 4K display yet. I only just got a 1080p TV and monitor about two years ago. lol
paid 150$ for pickup to trash yard. but cost 3000$ for fixing from service center. no brainer, just make it another world's trash pile and get another New TV
$0 to toss in the dumpster room.
Killed a pi by plugging HDMI in while powered on, I suspect it's the tv I used as it does like to float quite high above gnd
He should get the broken screen one and take the board from it :)
I continue to be amazed at the items you find in your dumpster. That chair is in better nick than the one I'm currently using when I'm at my computer. It would be worth trying to check out the USB inputs and also see if the network connection works or not. I'm looking forward to the more detailed repair video once you have settled in to the new lab.
Right? I would be pretty happy just to find the chair let alone a 4K TV
First thing to do is get a *price on the main board.* No point fiddling with it (except for a YT video) if it isn't too expensive just to replace the whole board. Also search ebay as parts are often listed there if someone breaks the screen but the board would still be OK.
That's no fun
@@cyb3rk3v - perhaps not but knowing its value can determine your effort to not screw up the repair too!
@@ElmerFuddGun, Dave is doing this to produce fun UA-cam videos for us, not to save money.
It's LG crap. Send it to the dump where it belongs.
Perhaps try playing some movie files from a USB drive?
Probably works if it isn’t integrated to the HDMI stuff.
rkan2 Only one way to find out. Come on, Dave!
And I bet it has networking capabilities as well
he doesn't have the remote to do it with, and this being a high end LG it probably has the weird arse magic remote that doesn't play nice
A USB drive might show up as input once it's plugged in.
I got an excellent salvage just before Christmas. One of the sales guys here, his mom's TV kaffed. It was still under warranty so when the tech couldn't get it going, they sent him a replacement. It's a 50" 4K Hisense Model 50H7709 Smart TV that would power up, the logo would display, then power off again. He was about to toss it in our dumpster and I asked if I could have it instead. He said yes and sure enough, I found some bulging caps in the power supply section. Ordered replacements, waited, installed and WOOHOOO!!! It worked! I had to order a replacement remote but it works beautifully. I gave it to my daughter for Christmas. A $300 tv for $8 in parts & shipping and a $12 remote.
Try an USB stick with some pictures, mp4, mp3s, etc.....
You probably need a remote to access the photos.
Probably any LG remote would work. Our even use a harmony of you have one.
Or use your phone. Oh, wait... thanks "lets make new smartphones cool by removing features" trend.
+awesomeferret An app that uses Wifi like this one may work:
play.google.com/store/apps/details?id=com.lge.tv.remoteapps&hl=en
I would try poking the logic board with a insulated poking stick while feeding the HDMI input. Then while poking around look for changes in the image quality and probably find the culprit.
If you get it working it would make one helll of a screen to display stuff in future videos in the new lab
You mean with his new microscope? :D
Can't wait for part 2!!
Hope there is a big dumpster room in the new office.
It's the same dumpster... The new office is in the same office complex.
@@fredygump5578 :o that's great news.
lol. How did you know he was moving if you didn't know it was the same business complex? Did you just read the titles of his past few videos?
Download a ir-remote app for your phone, if it's got an IR transmitter, (or if lg has remote app that goes over network) so you can explore menus a bit more and try turning off pic enhancment etc and try other sources, it probably have both wireless display and something smart-tv like youtube etc. Because it could actually be the picture processing chip instead maybe? Atleast since it seem to recognize correct hdmi resolution etc (although I know DDC is on a i2c line, I guess the same chip take both picture and data).
kruppin that’s all well and good but he needs a remote to get the WiFi connected..!! Doh..!
@@MrOrangeman18 but I said he should use the ir remote if possible. Many new phones have ir transmitters just for this very reason. And no, he could use a ethernet cable in the TV, no settings required, so... Doh on yourself. ;)
Lg does have a remote app, LG TV Plus. But, you have to do the connection first.
No ethernet port on the back? Never seen a tv without it from the last few years
@@kruppin "many new smartphones have ir transmitters" ... name one. My Samsung Note 3 from years ago had one, not anything I've got/seen recently.
I'd scan Ebay for a working replacement mainboard if poss. Had a few good results with TVs doing that. Normally sub £60 too, even for larger screen TVs. Newer 4k ones maybe more though.
I watched 2 minutes. Will come back. Was tv tech for 35 years, likin your ways
5:35 that's where you may be wrong. I had an LG TV very similar to that one, and after a few months it developed an issue where the backlight would just turn off in the middle of using it. You have to turn off the TV, wait like 20 minutes and then it would work again for no more than an hour.
Screen is in mint condition so certainly worth repair, what a find! Keep an eye on ebay for spare boards.
I think Santa Claus is visiting that dumpster regularly....
So Dave's been a very good boy this year
I miss phones with IR transmitters so you always had a remote with you.
so do I, I had a galaxy s4 and a galaxy s6. both had ir remote function.. then I got my s7.. Samsung removed the ir blaster for s7 upwards. glad I still got my old s4 and s6, as I never sell anything. but won't be buying another Samsung phone for that reason.. I hate my s7..
Most xiaomi phones have them
Yep, I'm still rockin' my LG G5 with no plans to downgrade to a newer phone ;)
@@09danstart note 4 has one and note 8 if the tv is web connected via wireless or ethernet enable virtual remote in tv settings and select control via network on the app to control it
Still rocking my LG V20. I'm basically sold on the Razr Phone 2, but I don't plan to purchase one for at least two more years, and the V20 will stay well used for many many years to come.
That's an epic find Dave, that TV cost A$4,599.00 in Australian currency when it was new and still sold in stores.
... and *cost* AU$ 199.99 to make AND ship to Australia.
*Modern* consumer gear is total rubbish.
I really hope there's going to be a follow up, in the new lab, with it repaired. :)
I love those kinds of videos where there's no obvious sign of the culprit and you have to dig around to find it.
I am green with ENVY... Well done Dave.
Its usual problem on UB and UF series lg tv with ursa chip (top left close to panel interface , used for improve PQ and mux osd with video)it has 2 channel vbyone interface to main soc ( mpeg decoder , hdmii mux and other video stuff ) one channel to osd graphics (work ok in this tv ) and second channel to live video data from all sources (broken on this tv ) , download service manual and you see it on block diagram , solution reball or change soc or ursa chip or replace mainboard
Do you have a link to the service manual?
@@EEVblog mega.nz/#!i2wTxSwS!4KGOtF40-AmOsmdX1i9MDVkCBCv28vQN8QeCCrCIwnA
on page 65
Makes sense, also explains why theres a missing heatsink right there 😉
It still blows me away was passes for garbage in some people's minds...
Perhaps a reheat of the hdmi processor might help.
Its typical modern technology, a pain to repair :-(
zx8401ztv You just need the right tools.
Hene193, i'm sure you are right, i was a bit pissed off yesterday as my washing machine went bang!! and it was beyond repair.
Just when things seem to be going fine, life kicks you up the bum lol :-D.
Washing machine beyond repair? Did your wife amputate both her arms? LOL
Try plugging in a USB flash drive/HDD with media and check if it plays the contents/Videos. .. Just a thought to further isolate the problem to HDMI processor.
He can't without the remote.
@@andycristea use LG remote app from play market or usb pc mouse
@@Full-master good idea with the mouse!
@@andycristea all he needs is a phone an app and one of these or make one from scrap parts.www.ebay.com.au/itm/Universal-Phone-Smart-Infrared-IR-Remote-Control-Emitter-TV-STB-DVD-Control-SW/113248686630?hash=item1a5e25d226:m:mgACMq3ygRIzngq-fwOR_Dw:rk:4:pf:0
Catch you n... * sudden LG 4K tv ad * ...ext time!
Get a heat gun and slightly flow it over the board while the unit is on. You may find when you pass over a chip or circuit it will snap back the picture temporarily. That might at least tell you the area of the board the issue is in.
Please, please, please do a follow up repair vid Dave. Would be great to see this beast working again!
Thermal camera Dave
Use the force Dave ;)
No thermal camera left in the old lab...
EEVblog hey maybe once you get this 4K TV working and all you can hook it up to the output of the microscope and then we can really see everything ;)
Use cold spray on the larger chip and see if that works, it works for many things like bad joints on a PS3 BGA chip. Cold brings things to life by using contraction to briefly pull everything tight.
Even if the mainboard is broken it's still worth to fix/sell it... the most expensive part on a flatscreen is the lcd/led panel!
I've just learnt my TV has the same joystick - I assumed it had no physical controls 🤣
I think this is worth a follow up episode once you are settled in the new lab!
You might also try a universal remote and see if you can get the smart tv features going, just to see if those are messed up as well, or if they're clear.
Simplest solution would be to do a quick dumpster teardown of the one with a broken screen. Put the screen in the bin and take the PSU/input/driver boards.
freediving things are awsome. Cool.
Wow what another good find well done that man
The screen itself looks fine. Im in the USA and you can order individual boards to fix things like this for about 20 to 60 usa dollars depending. Thats a very good find if you can fix it for the price of a refurbished board. And for the TV controls check if LG has a TV remote APP.
As it seems to be webOS based on those screens, hook up the Ethernet and use the LG TV Plus app on your phone as a full remote. That will get you into the menus. You should also install the developer tools app from the LG store and log in with a (free) LG developer account, which will let you turn on side loading of apps ahead of the day when they turn off the app store servers.
Just remembered when you poped the camera up... The camera IS the controller... It is a gesture controlled tv...
Also you should tripple check your HDMI cable... that issue with the screen can also be a dodgy cable.
Nice find! Would love to see more on troubleshooting and repairing this when you have the time.
Dave the HDMI inputs are particularly susceptible to ESD. I’ve picked up a couple of these corporate throwaways and have repaired them by replacing that mainboard for around $120.
I once found a $5000 samsung 65 inch behind a Joyce mayne. I took it home plugged it in and it would turn off after about 30 secs of use. I opened it up and all the problem was? 2 x $1 caps that had gone. found 2 that were the rated slightly higher. It ended up lasting another 18 months. It truly is amazing what ppl throw out
that's like, fuck the planet. I'll buy another planet.
@@springrollwang4441 Amazingly (or not so), near-on 90%+ of the creatures currently thrashing said plane(t) would ask "where do I put my card?".
probably worth giving each of the chips a prod while it's turned on see if there is a bad connection somewhere.
Sad it only lasted 4 years before crapping out though, I've been using my 1080p Toshiba TV for 11 years as a PC monitor.
you could try to use the USB port with a movie on it. maybe it work for play movies stored : )
if it has WebTV os you could always use a wireless protocol, or use a build in app
When i was a heroinist i used to find the most insane things in the dumpster.Here in Norway,ppl throw away everything!And i pick it up...
Good for y,man!
There is one of the thing you can buy it is a conversion kit for Raspberry Pi to TV screen.
That's most likely the entire main board, might be cheap and worth swapping out for such a nice tv
I have a sixty inch LG from 2011 that has lost sound but my receiver for sat service has sound ports so I get from there. A great look inside even mine may differ had a great look! Thanks! I worked on test equipment and aircraft fun seeing the display insides!
I think that is one of the best dumpsters in the world if you can get a working $300,000 oscilloscope out if it thanks to type of people or throwers working in the building. It is keeping us entertained. We need more people like that in the building to throw good working things out so Dave gets them and tears them down and fixes them.
He found one in his past episodes.
Some LG models can apparently have issues with solder. Haven't watched the whole video yet but maybe a reflow job?
Interesting that the HDMI connection negotiation seems to work to some extent. Would suggest that it's not necessarily at the input itself rather some intermediate connection. It's going to be an interesting project to trace that problem out though!
That was my thinking, particularly as only one source was used.
you can do a reflow and fix it 50-60% of the time, but even a full board swap is still usually only 50-100$(USD) on that tv maybe 100-150$ still worth fixing
This will be a great repair video Dave. Thanks.
Such a good find! Really want to see a repair video on this.
I think it would be a fun project/video to try to fix it...
This isn't dumpster diving. This is treasure diving!!
When my 2011 55-inch LG TV started boot-looping, I applied the 196C/10min "Zedic" bake recipe to the main board, and 2.5 years later, the TV is still going strong.
nice find, put circuit boards in the oven for 5 mins at 180c
You made new space, time to fill it up again!
Whats the status of the TV ? Eagerly waiting for your updates even after 3 months. lol
You need a universal remote. The LG TV usually comes with a WebOS and you can just use it as a smartTV with a Ethernet cable or wifi it if has one.
Netflix, UA-cam, etc all might work - or a lab project to display stuff over the web. Right now it's likely in the input mode for HDMI etc not the system OS.
The channels usually need to be "scanned" in the menu to even get listed.
It may be worth giving the main board a reflow cycle in an oven at 210 deg C for 10 minutes to fix any eventual dry joint, especially in the BGA chips.
210 degrees in an oven is "rehotting"; nothing flows at that temperature, except maybe some plastic parts. Real reflowing can be done with suitable equipment.
@@mjouwbuis depends on the solder type, and I mentioned degrees Celsius.
Dave, you should plug in the HDMI and then press strongly on all the ICs, maybe if it is a BGA you can guess which IC is having issues
I'd have started by baking the input board in an oven for a few minutes. That's enough to reflow solder on the BGA chips, and possibly fix the problem.
I wonder if those white heat sinks(?) are ceramic heat sinks. Samyoung is actually one of the largest capacitor manufacturer in Korea and make an OK quality capacitors as far as I know. Not the best, but certainly better than many Chinese off brand capacitors.
just try to find a similar main board from any LG service center!
i worked as a TV technician in LG and problems like that can’t be solved!
it’s a main board failure!
I would see if you can get the mainboard. As they can not be so expensive depending on the TV.
$300 for a board on ebay at the moment, but I see someone here has you covered. Would like to see you try the old backyard heat gun reflow for fun though before you swap the board out.
There's a missing heatsink near the big LG chip, check the glue blobs.
I wonder if the new digs have a golden dumpster room.
Dave, I hope you go through troubleshooting that mainboard even if you get a working one from somebody. Hey this is EEVBLOG right ;)
I got a scrap LCD tv couple weeks back, was told it didnt work, but powered up and the screen seemed fine - used pc input no probs. But 'no signal' when I tried HDMI, found issue was bad caps in power board giving low output on a 3.3V rail, which was used solely for the HDMI processing circuits. Two caps swapped and its all up and running again!
louis rossman would figure it out in a jiffy
that's a serious hobby you have dave ;)
So you can use it as an aditional intelligent soldering table )
You need something like "Coming soon to a dumpster near you". Of course, why can't it be near me!
maybe just the video in connector soldering?
It'd make a nice screen to connect an oscilloscope to.
Seeing as it's a problem with the HDMI you could see if the composite input will still produce a picture from the raspberry pi, it might help narrow down the search.
I haven't tried it yet (some youtubers have), but many chinese websites advertise "universal controllers" for any flat panel. You give them the model number and specific version and they'll program the board for you, send it in a few weeks .... for about 100 USD total...
I should come live in that basement!
Some one got evicted, and they left the TV. What a firggin score man!!! I bet you could even get away with a board level replacement would be cost effective.
Use a thermal cam like FLIR or FLUKE
The stuff you find is amazing
Simply heaven
What's up with the dumpster channel with Ben Heck?
Didn't you see Ben hiding behind the dumpster when Dave went to get the TV? ;)
Ben doesn't even do his own show any more.
that was a april fools ;)
You guys don't seem to get jokes very well ;)
@@UntrackedEndorphins because they are not funny! therefor they are not jokes.
Hey there. If you dont want to replace the board right now... if the unit has RGB inputs you could probably use those instead in the mean time. On LG tvs The HDMI signals are converted back to analog RGB before they go to the Tcon board so if the problem is not in the chip itself it should work like a charm. Enjoy your vids. Keep up the good work. Thumbs up! Also to anyone who is listening, HDMI ports are NOT plug and play. If you unplug or plug in cables while the tv is on you run the risk of this happening to you :o
Just order a new mainboard for it off of eBay or only use the smart functions. A remote can be found on eBay as well
OMFG !!!! 70 inch 4k monitor in the dumpster ?
Sweet find, good luck.