Servicing Christmas Light
This light was brought by one of my close contacts with the complaint that all LEDs were not lighting up. After opening the unit, I checked up and found that there were dry solder, which I patched up.
Replaced the two resistors, as these were out of range and marked its value on the board for future reference. Marked the connections on the reverse side too. Connected it to the mains and switched it on, it worked very well.
This unit had come a couple of years back, during which time I had replaced one of the thyristors. This uses a pasted IC!
Here are some of the snaps taken while it started working:
The customer was happy as it was just before the Christmas and he got it back within a matter of 30 minutes!
Another enhanced satisfaction added to the list!
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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You may check on his previous repair article below:
https://jestineyong.com/how-to-repair-no-power-fault-in-dvd-player/
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beh
August 30, 2018 at 11:34 am
Great report &thanks.
Robert Calk Jr.
August 30, 2018 at 12:04 pm
Good job, Parasuraman.
YOGESH PANCHAL
August 30, 2018 at 2:24 pm
well done! sir
YOGESH PANCHAL
August 30, 2018 at 2:24 pm
Quick fix! sir
Albert van Bemmelen
August 30, 2018 at 3:11 pm
Good job Parasuraman. It is unbelievable how quickly months go by and we are in December again. And a happy light in the darkest of days is always a good thing! I wonder though about that 'pasted' IC you wrote about?
Parasuraman S
August 31, 2018 at 8:42 pm
Its like a lump formed on the PCB. I have no idea how they make it. I have seen such ICs inside Remote Controls, LCD Displays etc. Its sort of pasted! Unfortunately, the snap I have taken is not clear enough.
Albert van Bemmelen
September 1, 2018 at 1:47 pm
Thanks, I was thinking in this regard you were referring to the replaced thyristor. But the photo makes it obvious now.
Justice (City of Durban --South Africa)
August 30, 2018 at 3:57 pm
Parasuraman great job and most importantly your article is interesting, thanks.
Humberto
September 1, 2018 at 4:19 am
Good job Parasuraman, as usual. Congratulations.