No Display In Samsung 32″ LED TV Repaired
This Samsung 32″ LED TV came in for repair with the complaint of no display. When i used a torch light to shine at the panel, I could see faint picture (TV Channel logo). This means the power section, mainboard and even the panel are good.
The problem is either the LED backlight or the LED driver circuit. The photos below are the mainboard and power supply board. The LED driver board is built into the power supply board.
I have checked the dc voltage to the LED backlight and found that the DC voltage came and dropped back to zero. This indicated there was problem with the backlight LED. If one of the LEDs in the backlight strip have problem the voltage will drop.
Next, I dismantled the panel and you must take great care of it otherwise if the TAB bonding breaks, it would be difficult to repair it unless if you have a special machine for this.
I checked each LEDs and found only one that was not lighted at all when test it with meter set to diode mode.
I do not have the ready part for this LED so I installed a used LED from another junk LED TV .
Once the LED is fixed and powered On, take a look at the photos below:
Conclusion- It is not tough to repair LED TV with dim display problem. Just follow my procedure and I believe you can repair it very fast. If you want to be good in repairing LCD/LED TVs, you can check out Kent’s ebook here.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Parasuraman S
April 3, 2017 at 10:34 pm
A Good repair work! Information shared is very useful!
Albert van Bemmelen
April 3, 2017 at 11:48 pm
Because of the TAB bonding I've not done such a repair myself yet. In my opinion TVs with backlight problems are just not made to fix without greater risk of extensive damage. So well done Mr.Suranga!
suraga Electronics
April 4, 2017 at 8:13 pm
Hi. Mr- Albert van,
Thank you so Much !
James
April 4, 2017 at 1:52 am
So did you let them know you had used a second hand part and informed them that there is a possibility that because you had fixed the tv with a used part that it might happen again. And also did you give them a discount for using a used part and not a new one
Zubair
April 5, 2020 at 3:24 pm
Hello sir Samsung 32 inch back light problom this Inver circuit -voltage ic to led back light problom inverter no out -voltage from ic plz help
angelo
April 4, 2017 at 5:53 am
thank you sir
perfectly done
we all (the learners) appreciate the hard work
of all of you (the experts)
Des Gilham
April 4, 2017 at 5:33 pm
No need to inform a client of any funny thing regarding a second hand part.
A repair has been carried out, immaterial. A Different diode could pop tomorrow! Same sympton, different part, same circuit!
Well done repair wise!
Luciano Khware
April 4, 2017 at 5:37 pm
Suranga,
Thanks for sharing your repair experience. Keep it Up.
Regards!
Asif Gokak
April 8, 2017 at 2:49 pm
Hi
I have a Sony Bravio EX72KDL46 model TV and 1 vertical line on full screen appears and the upper half screen shows multiple lines. So how can repair such problem. Please provide email ID I can send you the pictures of my TV.
Regards
reza
April 12, 2017 at 1:13 pm
Hi mr Suranga Bandara
thank u
Humberto
April 13, 2017 at 2:07 pm
Great repair Suranga.
Robert Calk
April 15, 2017 at 6:00 pm
Good job, Suranga.
Godwin
July 27, 2017 at 4:27 am
l have problem with 32" LG. It will work for fifteen minutes and off it will not on again until the power cable remove from the socket and plug it again before it on. Before you know it will off again. please what could be the problem sir?
Steven david
February 23, 2018 at 12:04 am
Hi sir how did you test the driver board bcos you said the voltage wen up n back to zero...did u switch it on n off again while taking reading? Im having same problem also but it show 0 volts at the connector end i need to knw if my board is faulty or my leds...everything u mentioned in this article is same sympthom as mine.but only the 0 volts is making me confused if its the board or leds.pls advice sir. Thank u.
NARESH
March 7, 2018 at 7:27 pm
Hi, same problem is with my Samsung 32" LED Tv , when i switch onn my mobile flash in front of TV display , i can see the channels and logo.
I just wanted to know what would be the repairing charge if LED backlight is defect. Waiting for your response. Thanks..
Klarence
June 16, 2019 at 12:15 am
Good day i do all this step but nothing happen what is the another option or other problem of the tv? Thanks