Jumping Of Pictures Solved In Panasonic LED TV Model TH-32D200DX
This TV belonged to a friend of my technician friend and was brought to me with the complaint that picture was shaking, jumping and a few horizontal lines were appearing on the screen. As we might all know, this is an indication of shorting inside the panel, for which the best solution is change of panel. But, because of the cost of a new panel and further the fact that we cannot give a guarantee like the manufacturers do, there was no other go but to employ some short-cut tricks, which is now-a-days quite common with almost all technicians who are experts in this field of servicing. My job was to open the TV, cleaning it thoroughly and send snaps of the scalar board showing the various connections that go to the panel, which I did.
My techie friend, about whom I keep mentioning quite often in my recent articles, gave me directions as to what needed to be done. But even though I used my microscope and tried to locate the tracks suggested by him, I took it to him along with a couple of other TVs, which had panel problems.
He removed the panel and took it to his table, spread the scalar board neatly on top of the Glass Table, used his powerful microscope and viewed the tracks on a very large screen. In fact, if we have such a facility, we too can handle these complicated cases. But we need to know what to do and might have enough space for it. In my house, my bedroom converted workshop did not have enough space to fix such facilities.
To technically explain, the panel gets VGH and VGL voltages which are plus and minus. These voltages flip flop on tracks along with the data lines, combination of all put together in the intricate circuits inside the panel produce the result. So, when any semiconductors or other passive components fail or short, that particular line will not be properly synchronized, which results in the lines, jumping etc. that we see on the screen. The temporary patch up or prolonging the life of the panel, is to cut those lines which are shorting inside. As we might all know, there are array of transistors which are PNP and NPN and work on negative and positive voltages. So, another method is to supply a positive voltage to the suspected tracks, which will keep one array of transistor permanently on and make that portion inactive. Though this might affect the resolution, normal eyes cannot make out the difference. It will just go unnoticed. There are various methods employed, details of which can be had from the Panel repair books promoted by Jestine Yong in his blog. ( Repairing Guides By Kent | Electronics Repair And Technology News (jestineyong.com) Repairing Guides By Damon Morrow | Electronics Repair And Technology News (jestineyong.com) )
Coming back to in this case, my friend first cut the tracks on the left and did not find any result. So, he rejoined them and then cut the tracks on the right, which solved the problems. In order to deactivate that portion, he supplied 26.5V (VGH) tapping it from the mother board. The work done is self-explanatory from the pictures given below:
Unfortunately, nowadays this type of service is very popular and it serves as an immediate solution for the customers, who want their TVs yesterday, if given today! Yet another method is to burn the shorted lines using an external Transformer of at-least 5A and selecting voltages from 12 to 100, depending upon the case. There are several videos available freely for using these short removal methods. But, the feedback is not very encouraging as the panels fail soon and the charges are very high for using such methods. The technicians do charge very high for all such panel services, as there is a lot of risk involved in all types of short-cut methods used, such as panel breaking or TV becoming dead permanently due to damages to the scalar board, T-Con Board or even mother board.
Anyhow, the TV was found working very well with a trace of some horizontal lines at the top and bottom, which are not easily visible when we watch. Mission anyhow successfully completed and satisfaction added to its collection.
This article was prepared for you by Parasuraman Subramanian from India. He is 72 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.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on Backlight Issue And Jumping Image Problems Resolved In PHILIPS 43PUT6002/56 LED TV
(70)Dislikes
(0)
20 Comments
Leave a Reply
Raj
October 28, 2022 at 6:05 pm
Thanks for sharing Sir.
Parasuraman S
October 29, 2022 at 2:32 pm
Many thanks for your comments!
Albert van Bemmelen
October 28, 2022 at 9:15 pm
Although your repairs are successful and your patience is admirable, they in a way also tell us that is is very hard to even consider fixing these special cases. When the result is always risky business. Especially when even a good result may not last for long.
Charles
October 29, 2022 at 8:27 am
Many thanks for sharing I will bookmark this article for future reference and practice once confronted with similar problems.Thank you for sharing and keep these articles coming so personally have gained a lot of confidence in this trade because of your guidance and the rest of techie freinds who share their accomplishments, lastly thanks to our host Mr Jestine Yong-hats off for you guys.
Parasuraman S
November 4, 2022 at 9:05 pm
Many thanks for your encouraging comments! We are all glad to note that you have found this forum very useful to you!
Parasuraman S
October 29, 2022 at 2:30 pm
Yes, I fully agree with you! Many thanks for your comments!
Andre Gopee
October 28, 2022 at 9:22 pm
Thanks Mr.Parasuraman for that interesting article. I have always wanted to find out more about this. So he cut the ODD and Even lines and jump the VGH and VGL lines to the ODD and even lines. Is this correct?
Parasuraman S
October 29, 2022 at 2:31 pm
Yes, dear! Many thanks for your comments!
Babu M S
October 29, 2022 at 12:44 am
Thank you very much for sharing the great risk work.
Parasuraman S
October 29, 2022 at 2:31 pm
Many thanks for your comments!
Peter Sheldon
October 29, 2022 at 4:08 am
As usual, another very interesting and informative article.
Thank you 🙂
Parasuraman S
October 29, 2022 at 2:32 pm
Many thanks for your comments!
Imoudu.O
October 29, 2022 at 2:15 pm
Sir, I do observe most often you make use of the word 'scalar board', even when you repair led tv as is in this case also, and I know scalar board is mostly associated with computer monitor. So I want to ask what is the difference between scalar and t-con board? Thanks for sharing.
Parasuraman S
October 31, 2022 at 2:02 pm
The scalar board is normally bonded to the panel and cannot be detached. Whereas T-Con board can be detached, as flexible connectors are inserted to this from the mother board and panel. There are a few rare cases of Bonded T-con board as well. Hope this Clarifies.
Waleed Rishmawi
November 1, 2022 at 5:45 pm
I never attempted such repair and I guess i will never will since it is very complicated and time consuming. thanks for sharing though and have a blessed day
Parasuraman S
November 4, 2022 at 9:03 pm
Many thanks for your encouraging comments, dear!
Imoudu.O
November 2, 2022 at 3:54 pm
Thanks sir.Now understood.
Parasuraman S
November 4, 2022 at 9:04 pm
You can always count me at your service!
Yogesh Panchal
November 8, 2022 at 6:47 pm
Good job! sir.
Parasuraman S
November 10, 2022 at 9:47 pm
Many thanks dear Yogesh!