Capacitors Burst And Fuse Blown Found In LG LED Monitor
In this article one can learn (1) Importance of checking all electrolytic capacitors in power failure cases (2) Importance of retouching all points on such boards (3) What is a technician’s moral responsibility
This, once again, was from the hospital where I work and reportedly dead. After cleaning up the inside assisted by my colleague, I carried the display and boards to home for troubleshooting. Found the fuse was blown and couple of capacitors burst in the secondary.
ESRs of caps were out of range too. So, replaced the all caps both in the PS and mother board. Retouched all the points on the board with fresh solder. Checked thoroughly for any more defective components.
Checked the output voltages and found these to be ok. Connected the boards to panel and found the Monitor working very well.
I carried the display back to office and fixed it in its cabinet and allowed it to run for a few hours. It was working very well.
So, another mission accomplished and satisfaction gathered as usual! Here is a picture of the components replaced:
Why did I replace all the electrolytic caps, including that in the mother board? The ESRs were out of range in most of the ECaps. Replacement of all the ECaps and retouching the board with fresh solder will bring back its life and durability, as the Power Supply section would be stable duly supported by the secondary in the mother board.
Filtering will be better and picture clarify would improve. I believe that a technician’s job is not just bringing the device back to life, but to do all that is essential for its failure free functioning. This is a moral responsibility incumbent on all technicians like us.
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 Dry Solder And Dropped Value Of Caps Found In ATX SMPS