LG Monitor won't turn on - LG 34UM95 / 31MU97 FIX
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- Опубликовано: 11 сен 2024
- A common issue that these LG monitor boards face is power outage management. The board in the video has suffered a sudden loss of power, such as a power outage or being unplugged without being turned off first, and refuses to spring on again.
The culprit to this problem is the IC205 EEPROM. It's stuck in a bad state and needs some help from us to reset itself in order to allow power back onto the board.
In this video I will outline how you can reset the EEPROM with just a multi-meter and fix your LG motherboard (LG 34um95p, 31MU97) in under 30 minutes and for less than $30.
This video is based on a thread by Integer13 and all credits go to his tutorial and the contributors in the comments below the post. This video aims to bring more awareness to the issue and make it easier for people to find a solution.
Link to thread in the pinned comment.
Hope this helps. Liking and commenting will help people who are also facing this issue find this solution, so please consider doing so! Thank you.
#LG34UM95 #FIX #31MU97 #LG
thanks, brought life back into this old monitor that had been sitting on the attic for the last 4 years. it took me a while to get it working. i think a total of 2 hours. spent 90 minutes 1 night without succes, left everything lay there and went to bed. next day i decided to give it a few more tries before cleaning it up. was on my last try then led lighted up for 2 seconds so gave it 2 more tries after that and now its working again. the P900 - SCLK was the 1 that worked. Thanks Again!
For nearly two years, my LG UM95-P sat unused, and online all I could find was information suggesting that in such cases, it's best to replace the mainboard. Until today, when I finally stumbled upon your video, and now I can enjoy my monitor again. The first method worked for me. Thank you so much for sharing your knowledge.
This worked perfectly for me! I really appreciate the video, as it is much easier to follow than the written blog post, even for someone with no experience in electronics. Thank you very much!
Thanks a lot. The instructions worked perfectly for my LG31MU97. The ship was located on the back side of the board.
Hi. Another one here (Spain) who just fixed one of them. It's from a friend. Thanks a million.
After checking your video i was able to save €320 repair costs. Even if both of your variants did not 100% work in my case i found the following solution:
carefully running over both sides of the ic205 pins with the multimeters pins did the trick. I am not quite sure how high the risk is, to kill the chip, but in my case it worked.
OMG, you're a life saver! The most complicated part was to get the cover opened from the monitor :D And my 31MU97-B had a little different board setup meaning the IC205 was on the flip side. And I did not find the P900, but method 2 worked with the first attempt when I already heard the beep :) What a relief! My first time doing something like this based on YT and with multi-meter. I'm surprised I made it :)
Thanks for sharing this info Tom! This brought my LG 34UM95C back from the brink after an extremely nasty series of power fluctuations from a failing UPS. The 3rd option is what kicked it back to life. I immediately performed a factory reset, tested repeatedly, put the back cover on and then mounted it back on the desk arm. Working GREAT! 👍👍
Just AMAZING!!! I just fixed my 10 years old 34UM95-P with the first method (Black on P900 and Red on CS# and SCLK couple of times) and BING!! Thank you Million!!! 🤩
It works for me.
- Multimeter setting: 60kOhm(mine doesn't have 20kOhm).
- Using #2 and #3. It will turn on after few times.
However, unplugging when it's on will make it happen again.
Thank you so much! It worked on my LG 34UC87M-B! My board has completely different layout and I actually found IC205 EEPROM on the other side of the board. One of the methods #2 worked (can't tell which, I tried both). Initially after a couple of tries it started once, but then it wouldn't turn on again. I tried a couple of times over two hours, but it wouldn't work. I was just about to give up and order a new empty chip and a programmer (I found dumps on some forums), but I though to give it another try. Not only this worked, but this time the monitor turned on with white screen showing service information (serial number, board etc.) it wasn't there when it started the first time. Did a factory reset, turned it off unplugged it from a power supply, turned it on again after a while. I've repeated it a couple of times. It started each time. I was confident enough to assemble it together. It's works great since then and looks permanent (I hope so). That said I may order a new chip just in case. It's dirt cheap. I just need to polish my SMD soldering skills.
Outstanding find! LG 34UC97 working.
The first attempt, we flipped the power switch and recreated the problem.
Subsequently resorted to only powering off safely through the menu.
Might have to replace the IC205.
Thank you!
Perfect! I was looking for a comprehensive tutorial for ages.
Thank you 👍
LG 34UC97 Just did this and it worked for me. Especially the step where the cs and sclk are bridged. writing this from that monitor i just fixxed ;D
Happy I could help!
Finally it worked for me with p900 and clk. But I had to put the positive (red) of the amperemeter to p900 and the negative (black) side to clk, not like you’ve shown in the video
Dude, thank you so much. This brought my monitor back to life and I’m so thankful.
The third option lit up my monitor. Thanks so much Tom. Appreciated for sharing the knowledge. A lot easier than other options like flashing the EEPROM.
Amazing tutorial. My board was different so thank you for sharing so many different methods. On the 31MU97Z - B you can’t really do method 1, so I opted for 2 and 3. I also realised that I was looking at the chip upside down. You need to look for the dot in the corner to find CS. Also listen to the sound of the chip. If it’s pulsing it isn’t fixed if it the tone becomes steady you should be good. Method 2 worked for me I believe (the 2nd one shown) as the third is also labelled 2 in the video. Thanks for helping me fix this monitor!
Amazing! Worked after a few seconds. Most work was getting the rear cover off the thing. Thank you so much! (34UM95-P)
Thanks a lot. The instructions in the video worked perfectly.
Great Video Tom, thank you very much!! Do more of this stuff. You saved me today ;) My 34UM95 is alive again.
Thanks You very much for this guide . I save lot of money with repairing my LG 31MU97 ( SCLK & CS method version )
3rd option worked great for a lg 34uc97-s. Much appreciated!
What was the issue? I might buy not working and try to fix
@@biutti1224 The EEPROM (Kinda like the OS in the monitor) gets corrupted or otherwise "stuck". Usingt he 3rd option allowed the EEPROM to reset to a point where the monitor worked again. After it boots the first time, reset the monitor to defaults in the menu, otherwise, it simply returns to being a dead monitor.
Lifesaver. This worked for me! Thank you
I think you saved my monitor! Thank you!
everything works fine, but you don’t need a multimeter for this; just take any wire, connect it to a 2-3 K resistor and do the same. Thank you.
Thankyou good sir, P900 to SCLK did it for me
Gracias muy buen video. Nos has salvado. Saludos y un abrazo
I have the same problem after I clean the back of the LG monitor model 27GL650. The motherboard is different from yours. What can I do then? Thanks in advance for helping me.
Thank you very much! my monitor works again!
Hi, I have a LG 34UC97 and suddenly wont turning on. I have opened back panel and examine the main board but there is no sign of shock burning and also checked the power adaptor and power chips on the board (with multi meter) and they are all fine. I think I could have the same problem but my main board shape is diffrent and I dont know which one is the chip you are working on it. can you please help me with it?
I hope it will work on my LG 34UC87M-B as well. We had a sudden power loss in my neighbourhood and it won't turn on. I wonder what's the difference between UC and UM models, but it supposed to have the same EEPROM chip. I'll check it out tomorrow.
Hi!, thanks for the tutorial!. Unfortunately it doesn't work on my LG. Does the multimeter have to report some particular value on the display to demonstrate that the procedure is working? the value on the multimeter goes from 1 to 0.7 only in procedure 1 only on #cs. in all other procedures the value on the multimeter does not change. Thank you!
Hello, I have a LG 38UC99-C and I don’t see a UC205 on my board… I only see a UC201 and a UC202, any suggestions?
Hi, now my monitor is turning on, but just with the backlight. No display, not even menu, no sounds etc. Did anyone had similar situation?
My 34UM95 doesnt have a rocker power switch and is powered on by the bottom facing button... Is there any way I can manage these fixes with this variation? Trying to hold that button down with my toe while I do it but being a toggle instead of a rocker I dont think it works the same.. 😢
Thanks for this.
Mine worked with 34UC97C-B, Used P700 (pin from switch on the other side of the mb), and CS# - SCLK changing (also other side)
Thanks a lot! It works! But I have the problem that when I turn off the monitor it doesn't work again. any recommendations? I have tried "reset" in the normal menu of the monitor.
For me, I had this problem 5 times before it truly fixed itself permanently.
I think what helped me was, resetting it, leaving eco power saving on, and being very slow when turning it off and taking the AC plug out. Do everything very slowly, its a fragile thing!
Hope you got it to work.
Hi, I'd like to know what is currently the easiest/best method to use to fix? I have a 31MU97. Took it off a monitor mount and accidentally banged it on my desk as I was taking it off the VESA mount. It wasn't too hard an impact, and only like from 6 inches from desk surface onto desk top. But after that, it wouldn't power on anymore. Tried a different power cable and different outlet with same result. It has been reliable for me for many, many years, until this.
I have obtained the firmware .bin file. Wondering if this is the easiest method to try, before multi-meter and eprom chip replacement? If so, what do I need in order to do the firmware update? THANK YOU!
It’s working
Happy to hear that.
Hello, the first method is working to turn the monitor on again, but after about 1 or 2 seconds it turns off before i am able to lift it up to do the factory reset in the menu. Any idea about this? Any advise would be great.
Then there is faulty on the op-amp. The op-amp may need replacement
I have the same issue with my LG 34UC97-S but i can't find the IC205 chip. Is there another one built in ?
The board is a little different than on this video for your monitor. Flip the metal plate that support the board. You will see the LC205. VCC to SCLK worked for me on LG 34UC97-S
Hi Tom!
I have now been sitting for approx 2 hours with no results. I have some values everywhere but nothing is happening.
Any recommendations?
Update: I get a reaction from P900 - CLK
Update 2: It works now, but I don't dare to turn it off again... haha
🙏🙏🙏💐🌹🌷
If you’re having issues with fixing, and live in the EU or UK, I am offering the service! Just send me the monitor and I will fix it for a small fee. Thanks
Here is the thread I based the video on! You can derive a lot of value from the comments under the blog and in there somewhere, there is a comment teaching you how to update the chip's logic so this problem will never occur again.
integer13.wordpress.com/2018/04/06/lg-31mu97-not-powering-on-how-to-repair-this-piece-of-sht/
Hi, I did all methods and the link you provide here with no success. Power fault occurred after a power cut off. I'm an expert tv technician
@@user-iy5rh7jj6q For me, holding P900 to SCLK until it turned on was the most reliable method. If that fails, make sure to also check if your power supply is still working.
Alternatively you can try to update the chip using a CH341A USB Programmer. There's a guide in the blog link.
Nice. Sux if it happens again though haha
My monitor is gone lmao