Stubborn Panel Short Left Unresolved In VU LED TV 55K160GAU
This is a story that proved the old adage ‘life need not be all on roses!’ It applies to our technicians’ field too! This TV was brought to me as per recommendation by a techie friend from a person living in my neighborhood. The condition of the TV when brought was like this:
The first step was to check the voltages and I found the following:
I posted this in my techie group and got some suggestions.
To begin with the advice was to cut the LC1 and LC2 lines coming out of the IC, which I did:
Picture was very good and clear:
The inside of the TV is being given for those who might be interested: (Please use cntrl+scroll to zoom)
All was well for a few minutes, until small horizontal lines started appearing at the bottom and dancing and increasing slowly to almost half of the screen. In came further advice from my techie friends. This time, the instruction was to apply VGL to LC1 and VGH to LC2 on the sides that go to the panel and if there was no improvement, shift these and see. Well, the same problems continued, though there was some slight improvement.
Then the next step advised was to remove the LVDS cable from the T-Con board one by one and locate which side was clear and which side had the problem. On checking like this, the problem was located to right side of the screen. So, I was instructed to cut the CKVB1 and CKVB2 at the extreme end where it goes to the panel and if the problem is not solved, just to short these two lines, which I did:
The problems still remained unresolved! Then the next instruction was to cut the data lines that go the panel and if problems continued, short all those lines on the panel side, which again I did step by step:
Well, the VU TV seemed to be amused in continuing with the problems. So, my techie friends concluded that the panel was internally short and even though there were methods to short and burn these by applying high voltage, it might not last longer and advised me to give up, which I was only happy to do after spending several eye straining strenuous hours spent on this, which lasted for more than a week!
So, dear friends, that is why I said, our life is not all on roses always! You might ask whether any satisfaction got added; yes, indeed, as I did what best I can, self-learning a lot and lot in the process, which counts more than the time spent! So, satisfaction coated with a big relief got collected! (LOL)
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.
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You may check on his previous article on Restored A CCTV Power Supply With A Perfect Output