No Display In Samsung QLED TV Model QA49Q60RAKXXL Gave A Surprise
This TV belonged to my school classmate to whom I had serviced many audio sets before. I had been complaining to him as to why was he not bringing TVs to me for service. Well, he responded positively and brought one TV belonged to his friends once, about which I have already submitted my report here and this was the second case. I visited my friend’s house on my return from duty in the hospital to check what was wrong. The TV was getting on, but there was no display and he reported that the sound was ok. When I tapped gently on the panel in a few places, I could make out that backlight was absent. He helped me load the TV to my car. Since this was a large sized TV and handling it alone especially the jittery part of taking out the panel was difficult and risky, I decided to take it to my techie friend who handled panel level bonding and other related services.
The TV was lying in my car for a few days as my techie friend could not give me a firm date, since he already had one of my TVs pending for solving a backlight issue that developed after panel replacement. Finally I got the green signal to deliver this TV and pick up the other one. On inspection of the TV, he mentioned that it was QLED TV and he had to first try to get a matching replacement of the backlight edge LED strips by sharing the model number. But when BLs of the other large sized TVs were available freely, the Edge LED strip for the size of a 49” was a rarity and the vendor had no idea unless details such as number of LEDs on the strip and the measurements were provided. That necessitated waiting for a few more days as my techie friend had no place to keep the TV open until BLs were received. Finally that was also done, but the vendor did not have an exact replacement and he placed an order to his supplier. My techie friend shared a picture of the LED: (It had 44 LEDs in one strip)
The BLs were received after a wait for more than 20 days, by which time both my techie friend and his son fell sick one after the other delaying the restoration work further! When the clouds got cleared and he could replace the BLs and check, yet another problem cropped up in the TV.
There was a vertical line in the middle of the panel, video of which was shared with me. Following is an image that I extracted from it:
He asked me to check with the customer whether the TV had this problem. The Customer mentioned that there was no such line and the picture was crystal clear. Now, I got stuck between the customer and my techie friend and felt like a monkey that got wedged between two fighting lamps! Anyhow customer was very decent and agreed to carry out necessary repairs to set right the unexpected problem cropped up. My techie friend had to dismantle the panel once again and he shared the following images marking the area of the side COF where the burning mark was found:
But look at the complications that we have to overcome when we take a TV with no display problems! As mentioned by me in the past, it is always risky and we may have to be mentally ready for surprises! Finally, my friend confirmed that work was done and the TV was working fine. As I was held up with other works here, I could not go there for picking it up for a few more days, even though I had another TV with me which required his attention for panel level service.
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Anyhow, the TV was checked at his end when I went there at last, and here is the picture of it:
I had to lunch out as I went directly from my hospital to his shop, but had to wait for hours together before I could get the other TV checked up, in which panel had to be replaced. I returned a bit late in the evening and had to drive the car in the night, though I normally try to avoid because of the road conditions and glaring lights from the opposite vehicles.
I delivered the TV to my friend as his home was on my way back in the main road. We two managed to hang the TV once again on his hall and play it to check and confirm that everything was ok. Following is a picture of that:
Thus this prolonged case (almost a month) got closed, deriving satisfaction to get collected and needless to say, I heaved a sigh of relief!
This article was prepared for you by Parasuraman Subramanian from India. He is 76 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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Albert van Bemmelen
March 28, 2026 at 3:33 pm
Another example of yet another complicated TV repair. Thanks for sharing Parasuraman.
I have seen the COF side bonding fix done in a Youtube or Facebook video by an engineer who only used a solder iron. Which seemed close to impossible to do to me in that primitive way.
Parasuraman S
March 28, 2026 at 6:10 pm
Many thanks for your expert comments and exposure!
Yogesh Panchal
March 28, 2026 at 6:44 pm
Good job! Sir,
Replaced COF??
Parasuraman S
March 29, 2026 at 8:23 am
Yes. Thanks, Yogesh Bai!
Tito Kanshulu
March 28, 2026 at 9:23 pm
Another excellent repair article from Parasuraman, well articulated and quiet educative.
Parasuraman S
March 29, 2026 at 8:23 am
Many thanks for your encouraging comments!
Mark J
March 29, 2026 at 3:22 am
Good job Parasuraman. I always enjoy your repair articles.
Parasuraman S
March 29, 2026 at 8:24 am
Many thanks for keeping me alive, dear Mark!
Hollis LuQuette
March 31, 2026 at 1:28 pm
Great job Sir.... I was thinking of you a few days ago when my friend brought over a set of Browning Golden Eagles Mark II for a restoration , these are the creme de la creme of tube radios ....... He will be bringing another set in the near future to do the same ..... I might be able to make some time and take a few pictures and a write up....
Parasuraman S
March 31, 2026 at 4:41 pm
Glad to know! Very eagerly look forward to your reports! Many thanks!
MP
March 31, 2026 at 6:52 pm
How the was the cause of burn of the COF handled ? I will be happy one day to read a presentation of how the bonding is done, no matter how backward the method may be. Those are the kind of mainstay manoeuvres for a deserving and honest survival. I hope you always share fairly the spoils with your 'techie' friends. It touches our tender hearts when you show a sense humanity for us lowly 'techies'.
Parasuraman S
April 1, 2026 at 5:01 pm
COF IC getting shorted is a common failure. It fails like any other electronic component! Plenty of Videos are available to watch COF bonding. Kindly search. Many thanks for your encouraging comments!
MP
April 1, 2026 at 7:43 pm
Appologies for the numerous errors in my reply above
Parasuraman S
April 1, 2026 at 8:19 pm
E&OE - This was mentioned in many manuscripts in my younger days. The full form of this is: Errors and Omissions Excepted. Some say 'Expected'. Anyhow, such mistakes might creep in in spite of all precautions. No need for any apologies for that. Many thanks!