Burst Capacitors Found In AFTRON LCD TV
This TV belongs to my relative staying around 20 Kms away from my home. She brought it to me with the complaint that there were some electrical faults in their house, after which this TV became dead. As usual, first duty is to open the set and do a thorough cleaning. This set had around 18 screws on the back! I saw mud inside bottom of the TV, which had peeped in during the floods that hit their house, which is near a river. This TV was lying dipped in the water up to the speaker level, after which, one electrician dried the TV in hot sun for many days before venturing to switch on.
It was working when they tried and served them well until now. The remote control got lost in the furious floods, that were swirling around the house. (The family was rescued and moved to a faraway place and could return only after a week or more).
The above two pictures would show you how much mud had got stuck inside. I cleaned the inside thoroughly using various brushes and blower and also cleaned the speakers well.
I saw two capacitors burst on the power supply board, saw burning marks also under the main filter capacitor. Replaced all the electrolytic capacitors in the power supply board.
I also replaced the micro switches on the panel, as these were found to be defective. As no remote control was available in the market for this set, controlling from the panel was the only way.
Checked for any strained components on the mother board. Checked ESRs of all the electrolytic capacitors on that board and found these to be ok. Hence reconnected the PCBs and applied power. The TV worked fine! So, fit it back and left it for trial run by my wife, who used it for a few days until my relative came to pick it up!
These are the defective components replaced:
No, no, I will not forget; this double satisfying job also got collected to the bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 69 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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