LED TV Backlight Problem Solved
This Combo Led tv was brought to me with complaint of backlight problem. The customer explained that when tv is switch on with remote, tv flashes light for about 2 seconds and goes off and return to standby mode. Also he added that tv was just repaired last two weeks with complaints of backlight problem by another technician and tv just worked for two weeks after the repair. So after verifying this complaints, I remove the back cover, checked the various voltages and the backlight voltage was abnormal.
Then I removed bezel, screen carefully, then the white sheets, down to the Led strips. Seeing the two led strips, it’s obvious the technician did a bad job.
Instead of replacing the two strips, he did what I call “join…join” work, see the pictures for yourself and judge.
So I got two replacement strips, fix them and did other connections, pictures below will explain further.
The last tv ‘now working’ picture is not clear because the channel station was a local station and weather was cloudy than, however when the customer came for the tv, he came with the remote,
I navigate to AV mode and use dvd player to test and picture was very clear but I forgot to take picture then.
The customer was very happy, with promise of bringing his crt tv for repair. This’s the finished repaired work.
This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.
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Note: You can read his previous article on Samsung Phone Charger Consistently Repaired
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Rich
August 26, 2023 at 8:05 am
Congratulations! I, too started this occupation later in life due to disabilities from my 45 year construction career. Yes, those panels are delicate, just wait until you get a 55" one
Nice fix, good luck in your new career!!
Parasuraman S
August 26, 2023 at 8:48 am
Excellent fix! You did a wise thing by replacing the back lights. Next time check the current drawn too and make it minimum possible to have a good lit background. The desired limit depends on the load and typically within around 300mA.
You are very right about our great Jestine Yong. Seldom do we find people like him who are very keen not only on imparting training, but also on sharing his knowledge publicly like this! Running this type of blog is not an easy task, as it is time consuming and taxing. But his devotion and commitment surpass all hurdles! May God bless him and keep him and his family hale and healthy for a very long time!
Kelvin
August 26, 2023 at 11:14 am
Good work
Robert Calk Jr.
August 26, 2023 at 12:02 pm
Well done, Imoudu!
Albert van Bemmelen
August 26, 2023 at 3:06 pm
I too dislike fixing backlight issues why I mostly avoid them Imoudu.
Sometimes the repair is easily done without breaking the flexprints or the LCD panel. And preferably those are the smaller ones. Oled TV's hopefully in future will save us from todays backlight problems, and as a bonus also do have much better excellent viewing angles.
Like you said it is applaudable in how much time and effort Jestine spends in running this successful blog and the Noahtech training center! Why we love our electronics hobby so much more!
Waleed Rishmawi
August 26, 2023 at 4:04 pm
good repair. thanks for sharing.
the best repair done is when replacing all the LED strips because if you repair the faulty one only, the other working one will go bad eventually so the best is to replace all strips. have a blessed day
Yogesh Panchal
August 28, 2023 at 12:58 am
Good Fix! Imoudu,
last Picture showing array of white bright spots on screen are they because of diffuser lenses?
Imoudu.O
August 28, 2023 at 4:48 am
Hi Mr Rish,
I appreciate your determination not to be tired down by life challenges and I wish you success in your new endeavour in life,have a nice day.
Imoudu.O
August 28, 2023 at 5:07 am
Hi Mr Parasuraman.S,
Thanks for your observation, actually what happens was I made mistakes when I was arranging back the white sheets, I got confused and placed diffusing sheet as the last sheet instead first covering the leds immediate,but now I understand better.Howerver your input will be useful to me in future.Thanks
Imoudu.O
August 28, 2023 at 5:14 am
Hi Waleed, thanks for your comments
Imoudu.O
August 28, 2023 at 5:20 am
Hi Mr Albert, thanks for your comments,I enjoy doing it, delicate though.
Imoudu.O
August 28, 2023 at 5:24 am
Hi Kelvin,Robert.C,
I appreciate your comments,Thanks.
John
August 31, 2023 at 6:07 am
" Man of the Century" I love it.