Easy Method to Repair a LG TV Using A Heat Gun
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- เผยแพร่เมื่อ 11 มี.ค. 2020
- Most videos suggested remove-and-bake the main board to fix the LG TV cold soldering issue. I tried to locally heating the component without removing the main board from the TV. This is so much easier and better than unplugging and plugging 6-7 cables. Besides, a few of those connectors have very limited cycle time... I have seen a spec. on a similar connector rated for 20 cycles only.
If your problem is related to HDMI switching (can't detect devices being plugged into the HDMI ports), I suggest apply heat to the HDMI switcher chip first.
I feel lucky this time and I got that to work in my first trial.
I have seen different failure modes on the same TV but I was able to fix it by baking the main board.
Each 'bake' was able to keep the TV running for 1-3 months... I am actually getting tired of doing this. I stopped buying LG products 2-3 years ago....
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Great video, very concise! This method worked for me to fix a 2011 model LG 55LV5500-UA smart TV. Like you, I left the motherboard/everything connected but I isolated the heatsink by placing 4 oven mitts around it to protect the board and focus the heat. Then 3 minutes of heating @ around 325-375 degrees while monitoring with an infrared thermometer. Thank you for showing us, and I hope others will take it into their hands to DIY more!
I appreciate your feedback, this will encourage others to try, hopefully the TV will not go to the landfill so soon. Thanks for providing the improved method to protect the board, especially he cables connected to the motherboard. They are very fragile (limited cycle time - to save $). For me, this method to fix the soldering issue will keep the TV running from a few weeks to a few months. If it fails again, I am able to fix that by reapplying heat to the chip. 😶
I can't believe that this worked! Ran a couple of tests and narrowed down the problem to the main board, borrowed a heat gun, set the heat gun to 250 celsius, waved it over the large heatsink for three minutes total and let it cool down, plugged it in and it works, thank you so much!
Really glad that it worked for you! Thanks for sharing!
Excellent video! You laid down the theory and implemented it. I used this technique on an LG 47LE5500 and it worked perfectly. Thank you.
Thanks for letting me know. I hope your TV will run for awhile. Mine finally failed after one year of use (which is relatively long this time). I will have to 'reheat' it tomorrow.
Thank you for posting this video. I haven't tried the method on my device yet but I'm sure going to do that.
I am glad to share... I have been lucky with this TV. I used 'baking in the oven' method and this is so much easier. I believe a hair dry will work also. My TV is still working after 9 months, but it may failure any time without notice. However, my LG phone wasn't that lucky. After I baked that phone and it lasted only 1 day. But LG was good then, they replaced the board for free, but I still have to pay $14 for shipping charge.
@@DIYUSA Thanks for the update. Yeah, I've given up on LG, myself. First, it was the phone which they wouldn't fix under warranty and, now, this tv which became a pain immediately after expiration of the warranty. No more LG for me.
@@Not_really Agree, I will not buying LG, not even a monitor..
It works. Picked up an infrared thermometer for $20. Already had a heat gun. Never wanted to reflow the entire main board by warping it in the oven. I knew this was a more effective way to reflow. Just could not find a resource explaining how to? Thanks for ref the flow soldering chart. I did exactly as you instructed. 46LD550 and THANK YOU for posting!
I am really happy it worked for you too. I didn't have confidence it would work for me when I filmed this video. I baked my TV's motherboard 3 times. There are very limited cycle time on the ZIP connectors hence it is always better not have to remove the motherboard. Per my past experience, I don't expect this fix will keep the system running for long... hopefully I will get a few more months of life time before it dies again. BTW, my TV is still working :-)
Is it still working?
Hi. I did this test today and it worked fine for me to. Let see for how long time 😊
Thank you very much for the video
Glad it works for you. My old TV works for over a year, now it stops working and I will 're-heat' it to fix it.
Thanks for the tip, my LG 42LW5700 is working again! Let's see for how long...!
Thanks for taking time to give me feedback. Hope your TV will last for awhile. Mine is still running :- )
Thanks for the tips
Thanks for watching and your feedback. Hope this will work for you.
this got me back up and running. i have a 86" lg and I changed out the power spply board thinking it was the problem,. I removed the main board first then used a hair dryer for 3 minutes. it did create another issue with the wifi no longer works but im fine with that since my devices wifi capabilities. but this fix is the same I did on xbox 360, it only last a short while. since the issue is the main board not power supply as troubleshooting suggest ill change once this stops.
Thanks for the feedback. My TV finally died after 1 year. It lasted longer than I have expected. I have to 'heat' it and see if it works again. Cheers!
42LV5400 fix applied. Result successful. Thanks for posting, especially the info re: re-flow temps. NICE!
Excellent. I am happy for you.. I hate to see a TV go to the land fill because the manufacturer not trying to improve their flow soldering process.. I am in this computer industry for > 35 years and I don't understand why LG not tightening their process. May be the motivation is greed! Want us keep on buying a new TV.
@waldguy is it still working after 4 months?
@@geraltofrivia688 Unfortunately no. The next try, the screen went goofy. May have overheated the processor. I think it takes a more serious solder reflow job.
@@waldguy From what I've understood, using flux is key to having it last longer than a few months as it removes the oxidation and makes a better joint.
@@DIYUSA You got it, my friend but this is not just a problem with LG, Samsung, Sony, Vizio, Sharp, and the list goes on and on, it's brand after brand same problem, is it greed? absolutely yes and it is a manufacturer motivation of greed, hoping that we are too stupid to know what they are doing, it's been going on for years so it's time that the consumers wake up and do their homework before buying their TVs even their vehicles, trusting these companies is our downfall. grab your phones and look up just 1 word and you will understand what and why you have these problems with the things you buy! { PLANNED OBSOLESCENCE }
Nice video
Thanks for your feedback and support! Cheers!
Yep. I ve shot my heatpistol randomly at the board for like a minute, and it worked! The downside is that after an hour or so, the set got stuck again.
Yes, a fix very often is temporary. However, I have fixed mine 4th time (prior to that the fixes worked for 1 month - 3 months) and it is still working. It has been over a year now. I would suggest apply heat to a specific chip one at a time. I will start with the bigger chip since the soldering surface is larger (than other chips on the PCB/motherboard) and more likely where the problem is. Apply heat for the duration as I have indicated in this video. Good lucky!
@@DIYUSA next time i will try and aim the chips that are the usual suspects.!
@@nikosatsaves3141 take the heat sync off and target the chip beneath. Squirt some liquid flux in between as well as it’s probably a dry solder. Check out videos on reworking a chip on TH-cam.much better than hit and miss technique
@@xray364 thank you for your response but frying the darn thing has worked so far
I have a Nexus 5x phone which is made by LG. It also failed due to cold soldering issue. I took it apart one time, heated the motherboard with a heat gun and it worked for about 2 weeks before failing again...too much trouble (and risk breaking the screen, etc.) to open and try it again.
Thanks for watching and your input. I didn't know Nexus is made by LG. Now I have another brand to avoid. I have been in this high tech business for > 30 years and I am surprised LG couldn't fix this manufacturing issue (or they don't care since the warranty is only one year). TV is a relative 'low-tech' product (in terms of manufacturing when compared with highly complex phones) yet they still not fixing the cold solder joint issues...I hate to see many products which can be used for more years but because the manufacturers want us to buy the new products and the old ones failed and go into dumpsters.
The heatsink is resting on top of the chip, not the solder so I wonder WHAT you are heating as this 320F would have to penetrate the chip and make its way to the solder points. Very risky to burn out the IC this way. REAL surprised it works.
It is nice to hear another success story from you. You asked a very good question. The max. operating temperature of a CPU is around 100C . But at a static state (not powered), the chip can handle much higher temperature. I have to look up the datasheet to tell you what that is. My memory is around 200C, which is close to the flow soldering temperature. I was shooting a slightly higher temperature to the chip with my heat gun. In wave flow soldering process, the PCB, with the chips mounted on it has to go thru pre-heat to prevent the thermal shock, then the assembly will run thru the hot solder for a very short time (seconds). We don't have that level of control with a heat gun. Yes, there is a chance to damage the chip. Since the TV was not working and I didn't want to spend hundreds of the dollars to replace the main board (probably no spare parts available for this old model). In my case, I have nothing to lose :-) Glad it works for you. Cheers!
my lg 42lb670 is stuck on the logo screen after the lighting event...the led in the power section flashes 3 times.. what the reason could be?
Thanks for asking. I have similar problem, the TV stuck on booting. It worth to give that a try (applying heat to the big chip-in my case, the one that has the heat sink). You have nothing to lose since it is not working in the first place. Good luck.
@@DIYUSA thanks
@@ageanageanic280 You are welcome. I appreciate if you can update me if it works for you or not. Thanks!
Hi, I fixed my tv used the oven method twice. The first time is working for 3 months. The 2nd time...7 months. 3rd time, failed using the oven method.
Thanks for sharing. I used oven 3-4 times also and finally using this much simpler method. On my third trial, initial it didn't work. Then I re-insert all the wires and it worked again. This could be your case too. The 'zip' connectors sometimes is difficult to align correctly.
You should remove the heat sink and use flux but yes this does work.
Thanks for your input. You are absolutely correct, the heat sink will ‘sink’ a lot of heat and it is best to remove it first.
Before I retired, the lab at work had equipment to replace the large BGA chips. Now, I don’t have access to the tools anymore. The heat sink on the BGA is not held down by metal clips, and it is not easy to remove it at my home without the right tool.
Now, I want to build and repair stuff with some very basic tools. That means I have to cut corners or come up with some new ideas to fix or build stuff. Hopefully it will be as good as if I have the right tools.
In the past I baked the whole motherboard, and I don’t have to remove the heat sink. Though I am very experienced in designing, soldering, assembling computers, I still made mistakes when I re-inserted the low-quality flex cables onto the motherboard (the cables have very limited cycle time - low cost). Therefore, In this video, I attempted to repair the TV without removing the motherboard. Glad it worked.
thank you very much. my tv is only a year old and I really didn't want to throw it in the garbage. I will let you know how it worked.
Thanks for your feedback. Hope this will work for you too. It will be sad to see poorly manufactured products going into land fill. Those manufacturers keep on saying saving the planet, but their actions telling the dirty truth.
So, did it work? Any suggestions?
This freaking worked
Thanks for sharing the good news. My TV is still working since I published this video. I am the luck one. Unfortunately, others may have their TV last for a few months to a few days. I hope yours's will last for a long time! Cheers!
Hi DIY, can I use your method to fix my LG TV Standby Light On But Won't Turn On? Will your method work? Thank you.
Worth a try, but it could be other simple problem. Once I baked my TV main board, and it didn't work. The problem was the alignment of the flat ribbon/Zip cables, one of which was off. The TV indicator was on, but nothing happen. I re-seated all the cables and it worked. You mentioned you have baked your board and it didn't fix the problem. This could be similar to my case. I have at least 4 failures with my TV, and each failure were different. Early on it didn't detect a HDMI plug in video connector. Later the TV was hung on boot. I baked it and fixed that. Then it failed again and hung somewhere else during boot. I baked at least 3-4 times. Finally I used heat gun and I didn't have to deal with removing the main board and all the cables... which could introduce another failure. SO far, it is almost 1 year now and it is still working.
@VIP Pham What did you do to get it working?
Hi DIY, it your tv still working using the heat gun? It have been 9 months. Thank.
Thanks for checking back. I am lucky this time. It is still working. My last three-four times putting the main board into the oven and bake it and the TV lasted 6 weeks to two-three months only. The best part (so far) is it works every time. The main concern for me is if I remove the main board (for baking), I have to handle many Zip connectors. Some of those connectors' cycle time are between 20-40 cycles (cost reduction for consumer products), that means I cannot keep on removing and reinserting the cables and this will become another point of failure which cannot be fixed by baking :-)
Sir, what was your tv problem?
Please see the details in my other reply related to the mode of failures...
How long did it work?
It really depends. Some people have the system last for two weeks. For my TV it is still working (over a year now). I did try to bake the motherboard before and that lasted for a few months.
He's it still working now?
Yes. Luck is on my side, it is still working. Not sure how much longer it will last ☺️
Waooo that's great mehn like a year now? Mehn
Great
I just wanted to try it here
@@revdoisrael Yes, this has been awhile. But have to plan it may die any time. I do have a 32" backup TV just in case.
Is your tv still working?
Yes, it is still working. I am lucky.
I want to try your method but I don’t have a heat gun and infrared thermometer.
You may use a more powerful hair dryer. However, without a thermal sensor, it would be difficult because you need to know if the solder reaches the correct/melting temperature.
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Hope you find this useful!
Just got my LG 43NANO75UPA.BUSYLJM working again with this. 320° on low air flow with a hot air rework station and she's come back to life again. Thanks!
Thanks for your feedback. Glad to hear another success story. The first few times (I used the oven to baked the board) didn't last very long, from a few weeks to 2-3 months, However, I am lucky with my last repair using the heat gun and the TV is still working. It has been over a year now.
@@DIYUSA Awesome! Glad it's still working now!
@@JustInvertedFpv Excellent news, one less item going into the landfill!