I have 2 different LCD TV's with 2 different problems I have already bought TV's to replace these 2 but kept them because I want to try to fix them if at all possible instead of just getting rid of them or throwing them away. The first one is a memorex MLT3221. The problem with this TV is that there is no back light there is sound and faint picture but no back light. I am assuming it is a power supply issue maybe a fuse or capacitor? I have torn apart laptops, desktops, iPods, all kinds of electronics and fixed them these will be the first LCD TV's that I have attempted to repair but I want to see if I can get them fixed but I don't want to buy a part and have it be wrong and wast that money. The second TV is a lg 32lc2du. The problem with this TV is that it wont stay on. It will turn on and run fine and then it will just power down and the green light will just keep blinking I am almost certain this is a power supply I have heard these models had problems with them. After it shuts down you have to let it sit before it will turn back on if you don't the power light will just blink. Any help would be greatly appreciated.
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Re: A couple LCD TV repairs Needed
Please remove the backs of the tvs and post pictures of the power supplies. Make sure the picture is within 2000 x 2000.Attached Files -
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Re: A couple LCD TV repairs Needed
Please start a separate thread for the second tv Put the make and model number in the title and if room a clue to the fault "keeps switching off"Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: A couple LCD TV repairs Needed
I will leave this thread as the memorex MLT3221 thread and start another for the lg sorry about that. I will post the memorex picutres in a minute.Comment
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Re: A couple LCD TV repairs Needed
pictures of power supply on memorexAttached FilesComment
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Re: A couple LCD TV repairs Needed
same pictures just trying to make sure they are big enough let me know if I need to take other photos or closer photosAttached FilesComment
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Re: A couple LCD TV repairs Needed
Well you have at least one obviously bloated cap on the power supply. I always advise people that if you see one bad cap, you should replace them all (cockroach theory).
My standard advice for replacing caps (regulars may skip).
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Re: A couple LCD TV repairs Needed
Thanks for the replies the question that I have for you is when you say replace all the caps to be safe are you only talking on the power supply just wanting to make sure also I have never changed one before so before I go to replacing them just want to know how to approach it. Do they need soldered in? I am not around the tv at this moment so I am not looking at it so sorry if I am asking questions that I could probably answer if I was around the tv. Like I said this is my first attempt at repairing any lcd tv's I just would rather save them than just throw them away if I can. Thanks againComment
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Re: A couple LCD TV repairs Needed
FAQ
https://www.badcaps.net/forum/showthread.php?t=485
Excellent soldering video on youtube
http://www.youtube.com/watch?v=I_NU2ruzyc4--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
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Re: A couple LCD TV repairs Needed
Got the old caps off the board ordered all new ones just waiting on them to come in once they do I will put the board back together and see if it works. I tried getting the caps at my local radio shack so I did not have to wait on them to get here but they did not carry what I neededComment
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Last edited by retiredcaps; 03-18-2013, 11:20 PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: A couple LCD TV repairs Needed
I checked there to see if they had anything so that I would not have to wait on them to come in but I ended up ordering nichicon caps online they should be here tomorrowComment
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Re: A couple LCD TV repairs Needed
Replaced the caps today put everything back together and the TV works perfect. Thanks for all the advice and help this was my first TV repair I am glad I could get it fixed instead of just throwing it away. Thanks againComment
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Re: A couple LCD TV repairs Needed
Well done
Nice to hear a good fix. You can start on the lG now. Perhaps you have and ive missed it!
Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: A couple LCD TV repairs Needed
Well done. Feels pretty good to save them, doesn't it?Comment
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Re: A couple LCD TV repairs Needed
Thank you and thanks for all the help and that is my next task I got the caps pulled off the lg last night ordered new rubycon ones just waiting for them to come in and I will see how this one turns out. I am kind of surprised at how different the boards are put together from one to the other. The memorex was very easy to solder and unsolder the Lg gave me some fits but I did get it to work maybe my iron isn't hot enough for the lg it is 45w and it worked beautifully on the memorex and it worked on the lg just took me alot longer.Comment
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Re: A couple LCD TV repairs Needed
Thanks it does feel good to save them now I am wondering what to do with them since I already have replaced the tv's. I figured why not try to fix these at least I would learn somethings about them and how they work if I fixed them great if not owell now that I have one fixed I dont know what to do with it I may just keep it as a backup not sure yet. I will update how the Lg fix goes. Thanks again for the help everyoneComment
when it doesn't work.
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I am working on a QN750Q8FNBFXZA. Dead except the standby light. It blinks what appears to be 1 3 1 2. 1 long blink, pause, 3 short, pause, 1 long, pause, 2 short, pause, repeat. A service manual would be very helpful, or if anyone knows these error codes. Thanks! -
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