Power Failed In LG FLATRON W1642S Computer Monitor Due To Burst Capacitors
This monitor belongs to the hospital where I work and was brought to me with the complaint that it went dead suddenly. The IT-Administrator helped me to open and clean the set thoroughly in the hospital itself. I observed that the Power Supply had two burst capacitors.
I brought the panel home along with the PS board and mother board with the key strip for further investigation and rectification.
I replaced these two caps and checked whether the output voltages were coming. It was. So, replaced the rest of the electrolytic caps as well in the PS and did a thorough retouch of the board. Then cleaned the board thoroughly using IPA.
Looked for any man made shorts using my microscope and indeed there was one. The opto-coupler primary pins were shorted!:
Rectified that and reconnected the boards to the panel and applied power. The monitor was found working very well.
Took it to the hospital, where the It-Admin helped me fix it back. It was rechecked and found to be working ok.
Mission accomplished causing the satisfaction to jump into the collection bag.
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 Maintenance Done In Computer SMPS Lasted For Five Years!