Saved EVEREADY LED Bulb And LED BATTEN From Dump
These lights belong to my house and became defective one day to give me the amusement of fixing these!
Case (1) Eveready-H12-20-LED Bulb: This bulb conked off one day and I opened the dome sprinkling IPA on its side and gently prying it open.
The LEDs were all burnt. The driver was in bad shape.
I removed the LEDs using a hot plate and scraped it clean taking it to my Car Garage.
After removing the LEDs, I checked up at random and was surprised to see that the LED was drawing 8.1V!
The reason obviously is that the LED had built up resistance and the LED Checker pumped in 8.1V to get a current reaching at the other end. But this was a unique experience! Anyhow, after studying the array of LEDs, which was 9LEDs in series x two rows, connected in parallel and the voltage output was reading 74 Volts, which on load is expected to adjust to the required voltage because of the current drawn, I fixed 3V LEDs in place.
Then I replaced all the electrolytic and fixed caps on the board, as these were found strained. Retouched the board very well so that there were no dry solders.
Rechecked the output and it was good enough. So soldered the LED Board, put it inside the bulb and fixed the dome and applied power to see a good light emission. Unfortunately, in my excitement I forgot to click the voltage reading and populated LED board! Here you can see the bulb glowing and looking at the defective components expunged!
Case (2) Eveready LED Batten-LBT-4FP: Those of you, who have not read my article on a similar LED Batten, may please do so, as values of some bust components in that could be known in this article:
https://jestineyong.com/capacitor-fumed-in-eveready-led-batten-model-lbt-4fp/
This was yet another case of bulgy tank capacitor. Having experienced in handling such a batten, it was easy for me to flip open the side covers, de-solder the supply wires from the LED strip and gently pull it out. Then the LED Driver was also pulled out, just like how I had described in the previous article. The values of the Fixed and Electrolytic capacitors may please be noted down for future reference:
The value of the electrolytic capacitor was 100uF/80V. I replaced the electrolytic capacitor with a 100uF/160V and fixed it straight like how I did last time. The voltage readings were also same like last time and there is no need for repetition. Then applied power and found the lamp to be working very well like new!
So, fixed the side covers and kept it aside for fitting it in place later.
Double missions accomplished with double satisfaction, which followed one after another to avoid jumping on each other causing injuries, which the bag readjusted and accommodated happily! (What all weird imaginations I get into, eh?) (LOL)
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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Albert van Bemmelen
March 2, 2024 at 5:27 pm
And there was light. Parasuraman's light! (lol)
Parasuraman S
March 3, 2024 at 11:00 am
Ha! Ha! Ha! Many thanks for your hilarious comments!
Arunkant L Pandit
March 9, 2024 at 1:35 pm
Dear Sir,
SMD led 2835 package comes in three variety mainly. It has 0.2 watt-3volt, 0.5 watt-3 volt, 1 watt-6volt, 1 watt-9 volt specifications.
The led bulb under repair was 14 watt, It was having 9 volt smd led 9nos in series of two parallel configuration. This 9 volt one watt led is having 110 mA current rating.
Parasuraman S
March 9, 2024 at 8:23 pm
Many thanks for your detailed technical advice! 9V SMD LEDs are not available in market for purchase!
Imoudu.O
March 2, 2024 at 8:27 pm
E-technicians are invaluable to their families.Good job sir
Parasuraman S
March 3, 2024 at 11:03 am
But wives seldom acknowledge and appreciate the value! They dislike the house becoming a mess with scattered sets lying all around, like an earthqauaked city! This is the general opinion from many technicians in my whatsup group! Many thanks for your comments!
Jaya Kumar
March 2, 2024 at 8:56 pm
Highly appreciate you for spending time even for small gadgets like led lamp and batten.You are doing a great service to protect mother earth from electronic waste.
Thank you sir,
Jaya Kumar.p
Parasuraman S
March 3, 2024 at 11:03 am
Many thanks, dear friend!
Anwar Yunas Shiekh
March 2, 2024 at 9:46 pm
Wonderful work, but I suspect the components cost more than a new bulb.
Parasuraman S
March 3, 2024 at 11:04 am
Yes, it could! But nothing to overtake the thrill associated with it!
Henrique J. G. Ulbrich
March 3, 2024 at 1:44 am
Excellent work, dear Parasuraman. And, as always, with good doses of humour.
Parasuraman S
March 3, 2024 at 11:07 am
Many thanks, dear friend! There is humour in each and everything! We need to be internally happy to see it and enjoy!
Imoudu.O
March 3, 2024 at 2:41 am
sir, i want to ask if in radio the fm/am ic vcc is measuring very low input voltage: instead of 3-12V, it show 0.36V, can i assume its faulty or what can i do.Thanks.
Parasuraman S
March 3, 2024 at 11:09 am
Something is shorting in the load. Look for any shorting active components or leaky passive components like capacitors. If nothing is found, replace the IC, if power supply is good enough.
Yogesh Panchal
March 5, 2024 at 6:00 pm
Remove the IC & check Voltage on IC VCC Pin pad on the PCB if voltage is OK...Replace the IC.
Parasuraman S
March 8, 2024 at 7:59 am
Yes, a good suggestion!
Tayo
March 3, 2024 at 3:07 am
Well done Maestro!
Many of these bulbs make it impossible to repair bcos they are sealed in insulation. It also never occurred to me to check the voltage drop across individual LEDs in bulbs. Learned a new trick today!
Parasuraman S
March 3, 2024 at 11:10 am
Many thanks, dear! Electronics is always very interesting and educative!
Waleed Rishmawi
March 4, 2024 at 2:46 pm
no satisfying job without capacitor replacement..the joy of repair being displayed here..LOL. good repair my friend. have a blessed day
Parasuraman S
March 4, 2024 at 10:22 pm
That is my favourite! I never miss any chance! (LOL) Many thanks, dear!
Yogesh Panchal
March 5, 2024 at 6:01 pm
Good Job! sir
Repairing house hold items are thrilling job.
Parasuraman S
March 8, 2024 at 7:59 am
Many thanks, dear!