Dead LED TV restored back to life. Model: Fuji Japan
An old LED TV set was brought to my shop for repair by my ex football coach. The customer said the TV went dead right after a power failure in the house. It has no stand by light no any indication of any life left in this device.
Getting to the main power supply was very easy.
I did not have to take the whole frame off to get inside, just few screws off in the center of the frame and I could see the metal frame.
Beneath this metal frame sits the power supply and that was my repair target.
I checked the fuse and it was intact which means it was getting power but for some reason, it was not coming one. I looked for bad plugged capacitors and I found none. When I looked to the back of the board, I found a lot of cold soldering joints and right away, with my soldering iron, started to re solder every single joint on that board including the SMD parts.
Sad to say, after all this work, started getting power up to the secondary side of the power supply. I guess it was a progress but not enough to bring the TV back to life.
I this time, I was suspecting a lot of bad capacitors on that board. The method that I used was heat and freeze. I heated the capacitors in certain areas and try the TV if it comes on or not. Finally after a while, I came to a certain spot that when heated with a hair dryer, the TV came on.
When the TV came on and a nice display on the screen, I used a cold spray on the same capacitors I froze these parts just to make sure the capacitors are the bad parts and not the other components around it. Sure enough, the moment they got cold, the TV would not start at all. Right away, I replaced all the four ones in that location.
1000uf/16 x2
450uf/10 x2
Right I after I replaced these four capacitors the TV was a live again.
It took me a while to re solder all these cold soldering joints and the replacement of these capacitors but it was worth it. The TV is back to life and the customer was happy. Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Parasuraman
January 22, 2018 at 9:59 pm
Excellent and unique way of troubleshooting!
George Greenfield
January 22, 2018 at 10:18 pm
Good repair technique. Done that myself to locate faulty components. Great Job Waleed.
Albert van Bemmelen
January 22, 2018 at 10:19 pm
Good Job. Applying heat with a hair dryer and cooling down certain areas is a well known procedure. Nice to know that it also is a smart method to easily detect bad e-caps. It helped me in the past to find a bad contact in a PAL Delay Line module of a Commodore Amiga color Monitor. (By-the-way: The delay line in CTV and Monitors is necessary because the bandwith of the chrominance is much smaller than the Luminance signal bandwidth and both need to address the same pixel spot on the screen. So the Luminance signal is slowed down to the match the speed of the chroma signal.)
Suranga Electronics
January 23, 2018 at 12:56 am
Good Repair Mr..
and Common Cap fault in Tv power board.
mohammed aly
January 23, 2018 at 3:40 am
Hello sir,
could you please explain more about the"heat and freez" method of testing.
thank you
Anthony
January 23, 2018 at 5:51 am
Good repair Waleed, another tv saved from the landfill !
doraiswamy SR
January 23, 2018 at 12:06 pm
pls explain how to do freeze check?
Robert Calk
January 23, 2018 at 1:13 pm
Good job Waleed. I didn't think freezing would work on an e-cap. Glad to see it worked.
Tito Kanshulu
January 23, 2018 at 4:10 pm
Interesting work Waleed that needs a settled mind
Nawual
January 23, 2018 at 6:56 pm
I want too:"could you please explain more about the"heat and freez" method of testing."
ThankS!
Mason Sarles
January 23, 2018 at 9:30 pm
Nice work starting in the logical place. A lot of work to resolder the cold solder joints but worth the effort while you are in there. Good use of cold and hot I would not have expected the heat would have brought the electrolytic back to life during testing. Reading these article is one way I sharpen my skills. Thank you for sharing your work.
Best Regards,
Mason
mohammed aly
January 24, 2018 at 3:39 am
https://www.youtube.com/watch?v=TXGxE9Fxhlw
Yogesh Panchal
January 24, 2018 at 2:32 pm
Good job! Waleed
Moniem
January 24, 2018 at 11:23 pm
Wonderful
Gary Gemmell
January 25, 2018 at 11:09 am
Would a hot air gun not have made the job quicker.
Evenif it meant mounting the board on a bench and heating from underneath to prevent components falling off?
Ulises Aguilar Pazzani
January 30, 2018 at 12:02 pm
Mr Rishmawi grate job Sir
Henry Kimani
February 2, 2018 at 5:20 pm
Great. I enjoyed the article
Joshua oloo
February 6, 2018 at 4:45 pm
Good work.keep it up.
Akshay ramesh shendte
July 8, 2018 at 5:09 pm
Hello sir I am learn repairing because reason is you sir thank you very much