Jumping Double Image Problem Solved In Samsung LED TV Model UA43AU7700KLXL
This TV was brought by a new customer accompanied by a known person, when I was not in the house. The complaint given was up & down jumping problem with double images. I took up the TV after my return. Two legs at the bottom have to be pulled out as there are no screws on the back cover on this TV. Opened the screw less back cover using a prying tool from all three sides except the bottom, where COFs of scaler boards would be there. Those of you who want to know how to open such a TV may please see my previous article on a similar set:
I did a thorough cleaning of the inside. Let us have a look of the inside of this TV, motherboard of which has Tcon in it.
There are two scaler boards with inter connecting FPC, with a Single large size FFC from the mother board to one of the scalar boards. Each scalar board had six COFs.
The PS board reference is BA43FA130 and that of the Mother board is KANT-SU2E-AU7000. I took clear photos of all the COFs on the left and right side and sent it to my techie friend who always helps me. He asked me first to detach the FPC cable and check whether the jumping problem was there or not. I removed the FPC and checked. One side picture was stable, indicating that the panel short was on the left side.
Out of the six COFs on that side of the scalar board, one had LC1, LC2 & CKV Lines marked from 1 to 8. I was advised to remove the 100 ohm resistors of LC1 & LC2 to isolate that connection to the panel, and see. This is an intricate work, as we need precise removal with concentration, focus and it is a bit eye straining too. I used my special soldering iron setting temperature to 400 and used PPD paste to remove these two very tiny resistors using 10X lens for a proper view.
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But just isolating the LC1 & LC2 did not solve the problem. Then he advised me to remove CKV1, 2 & 3. Once again I got engaged in removing these three tiny resistors like before. I had to take a break and allow my eyes to recover from the strain. Let us have a look at the related pictures:
Then what happened? The picture was steady as the panel internal shorts had been bypassed! Let us have a look at the result:
The TV was left on for a few hours and found to be working very well, after which I informed the customer sharing the video. As one of my another techiefriend visited me, I took his help to go to the customer’s place and install the TV there, which was very kindly handled by him. One question nagged me; was I taking undue advantages of the regards shown by my techiefriends? But from the reactions and further readiness to provide any help to me, showed that they were all only too glad to guide, help and assist me! Something I may have to be really thankful to them and God!
I cautioned the customer that what I have done was a temporary bypass surgery and the best solution was change of panel.
Mission accomplished with satisfaction and learning getting added to the collections!
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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corriette cyrille
June 27, 2026 at 5:48 pm
Wonderfully done. It's always satisfying to save from the pollution that would have caused had it not been saved. Continue to help.Greatly appreciated.
Parasuraman S
June 27, 2026 at 11:09 pm
Many thanks for your admiration and comments!
Tito Kanshulu
June 27, 2026 at 6:38 pm
Regardless of the help rendered by your friend, I have to congratulate you on the excellent repair Sir, though it is called a temporary repair as it requires change of panel.
Parasuraman S
June 27, 2026 at 11:10 pm
Many thanks for your encouraging comments!
Albert van Bemmelen
June 27, 2026 at 8:47 pm
It is rather amazing that just removing such tiny 100 ohm resistors have such a huge satisfying impact on solving the COF shorting panel issue. And I understand that there was no need in replacing the previously invain removed LC1 & LC2 resistors afterwards.
I am quite curious on how long such a quick and cheap fix will keep working.
Parasuraman S
June 27, 2026 at 11:12 pm
From case histories, it runs for many months and sometimes years. That's why many customers look for shortcut methods and technicians take risks. Many thanks for your comments, dear Albert!
Mark J
June 28, 2026 at 2:38 am
Parasuraman great job on the repair. I always enjoy your TV repair videos.
Parasuraman S
June 28, 2026 at 7:40 am
Many thanks, dear Mark! Very loving of you to find time to 'mark' your comments!
Mark J
June 29, 2026 at 7:43 am
Sorry I meant to say articles not videos.
Yogesh Panchal
June 28, 2026 at 4:56 pm
Good fix!Sir
Using a resistor to bypass a shorted TV panel is a good option provided by the manufacturer; I know that in the past, technicians used to fix the shorting issue by scraping the edge of the panel with a mini grinding machine.
You are lucky to have tech-savvy friends to help and guide you when needed.
Parasuraman S
June 29, 2026 at 8:06 am
Yes, of-course! My techie-friends are too good and generous in offering help! I used to wonder whether I really deserve such supports as the returns that I could provide are minimal or almost nil! Many thanks for your comments, dear Yogesh Bai!
Imoudu.O
June 28, 2026 at 10:04 pm
Good tv repair work,though it's uncertain how long this will last before panel collapses again,needing panel replacement.
As for your friend that replaces tv panel,does he replace with brand new panels?
Parasuraman S
July 1, 2026 at 4:36 pm
Yes, he does replace only with brand new panels. He keeps sufficient stock. Many thanks for your comments!
Imoud.O
June 28, 2026 at 10:23 pm
I thought this method could rather be seen as 'cutting method'. I learnt from one of Kent liew e-books and ofcause youtube videos that bypass method has to do with missing voltage(s) in panel cof ,and the use of thin copper wire to pass such missing voltage (e.g vgh) from t-con board to panel cof.I stand to be corrected sir.
Parasuraman S
July 1, 2026 at 4:37 pm
Yes, this has become a regular practice with techies.
Imoud.O
June 28, 2026 at 10:46 pm
As pertaining to ur helping techie friends,consider yourself a very lucky man,in my state,one can not have such favour,rather we see each other as competitors, not willing to disclose our experiences to another.I gain most of my experiences from this all knowledge blog and youtube videos.This acticle is such, thanks sir.
Parasuraman S
July 1, 2026 at 4:39 pm
Many thanks again, dear Imoudu! Yes, I am indeed lucky to have such techiefriends who give me a lot of regards and respect and help me to their best.
MP
June 30, 2026 at 3:27 pm
Handling big tv screens is mostly inclined towards extreme keeness not to damage the screen, failure to which case there is spoiling your professional image. Too bad if in any eventuality the panel as little as cracks. Its a high risk, but thanks for encouraging us, lets push courting trouble to the back of our minds and be bold. Its not easy going through all that successfully as you exemplify though. Even when handling an easy task, something will occationally crop up along the path of success to put to test your: knowhow, human edurance, and, level of vitality.
Parasuraman S
July 1, 2026 at 4:41 pm
Yes, very true! Many thanks for your comments, dear brother!