Level Shifter ICs Found Defective In Videocon LED TV MODEL LEDVJW32HH-2FA A1
This TV was brought to me by a friend of my regular customer with the complaint that there was vertical shifting of picture, splitting, and jumping.
I opened the set and did a thorough cleaning of inside.
Then checked the voltages on the panel and found the following:
The voltages were quite normal. After consulting my techie friends, who were of opinion that some tracks would have to be cut from the level shifter IC, I kept the TV aside for attending to it later. Anyhow, as I was not getting time and already taking my pending load to one of my Techie Friends, I allowed it to get solved by him.
He checked the Level Shifter IC outputs and found that the VGL/VGH shifting was not taking place in one of the outputs. He suspected both ICs to be defective and ordered for replacement. I left the TV in his place and returned home to pick it up later.
As the panel was not working properly even after replacement of these two ICs, he ordered for a second hand panel, which worked well for watching, but with appearing horizontal lines, which might go unnoticed and did not hamper view. (My guess is that the tiny hair like tracks of the level shifter ICs would have got damaged due to replacement of the ICs, necessitating the need for a change of panel) These lines just appeared suddenly for a few seconds and vanished.
Then when I went there to collect the TV after a few days, I found the TV to be viewable and informed the customer along with the pictures and videos. He was satisfied and therefore I brought the TV back to my home and delivered it. Customer satisfaction indeed was responsible for adding one more to my collection bag. Here is the final picture:
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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