Revisit Of HCT TV Monitor Model HLD-150MDP After A Gap Of Two Years
Those of you who have not read my previous article published in April, 2021 may please read it before reading this article, as I am not repeating many of the images already provided there, and will focus only on the problem and rectification done this time.
This time (October, 2023), the set was brought with the complaint that they heard a loud noise and the set went dead thereafter. With my previous experience of losing broken part from such bursts, I opened the set carefully and shook off the broken top portion of the SMD switching IC.
Kept the broken piece in place on top of the IC and read the number as FAN7602. I noticed that the fuse was blown, Mosfet was short and a 100 Ohm and a 2.2 Ohm resistors were open.
I removed the broken IC and open resistors. Then looked for any more shorted or open components both in the primary and secondary and could not find any. The Ring Test showed healthy. Then, connected a three wire module (about which I have already covered in many articles before and not repeating it here) and found the output ok.
Got replacement of the switching IC and after soldering it, retouched the board thoroughly with fresh solder. Replaced the Mosfet and open resistors. Then connected 12V 25W bulb and tested it to find it working very well.
So, fit the SMPS board back and allowed the TV to run for several hours before calling the customer to come and pick it up.
Mission accomplished with satisfaction collected to the bag.
This article was prepared for you by Parasuraman Subramanian from India. He is 74 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 Fixed Another Bang And Olufsen Model Biocenter 9000 Without Creeps!
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Waleed Rishmawi
January 20, 2024 at 9:23 am
Good thing that you were able to see the part number. Another good repair by a professional. Thanks for sharing. I enjoyed the article. Have a blessed day
Parasuraman S
January 20, 2024 at 11:09 am
Many thanks, dear friend!
Ivan Letic
January 20, 2024 at 3:00 pm
Another outstanding educational article.
Parasuraman S
January 21, 2024 at 12:08 am
Many thanks, dear!
Tayo
January 20, 2024 at 7:01 pm
Electronics on your town can fail with now worries bcos you are on the job. You are better than extended warranty plan. Well done again Sir.
Parasuraman S
January 21, 2024 at 12:09 am
Well, all our us who have a passion in elctronics repair, are real contributors for controlling the e-waste. Many thanks for your unique comments and encouragements!
Albert van Bemmelen
January 20, 2024 at 7:29 pm
I suppose that normally devices do not reach the revisit stage at repair shops.
Because by that time the owner usually would have discarded his set preventing another too expensive repair.
Luckily that is never the case when such a device needs another repair from you!
Parasuraman S
January 21, 2024 at 12:12 am
Here in India, there still is a good percentage of people who would like to have the defective set repaired and restored. Mainly because, the users get attached to it and do not want to part with it unless it reaches the stage. But there many, who would opt for a replacement. Anyhow, it is good that we do get sets for repair. Many thanks for your expert comments!
Yogesh Panchal
January 20, 2024 at 9:22 pm
Good Fix! Sir
Parasuraman S
January 21, 2024 at 12:12 am
Many thanks!
Jaya Kumar
January 22, 2024 at 9:22 pm
Sir,
Another nice article from you.Keep the spirit for taking up these type of works high.Also for writing about it, so that it becomes useful for many others.
Jaya Kumar
Parasuraman S
January 23, 2024 at 9:36 am
Many thanks for your wonderful encouraging comments! Knowledge is something that grows within sprouting new branches, whenever we impart it to others. I have experienced that new ideas and short cut methods form and hitherto unknown working principles emerge from within, whenever we sincerely write about it and/or teach about it (like our Great Jestine Yong). The more we hide what we know from others and confine to selfish means, the worser will we become.