Surprised Finding Haier TV Model LE32B7000 Working Well With A Bulged Cap Inside!
This TV was given to me by the maintenance staff at the hospital where I work stating that the sound was muffled and low. The TV was working very well otherwise (which I checked in my home too).
I brought it home and opened it for cleaning. I was surprised to see a capacitor bulgy!
The condition of the speakers were as expected; the paper was torn all-around! I fetched a new set of speakers and replaced it. Then replaced all the electrolytic caps in the power supply and inverter side. 470uF/25×2, 330uF/35Vx2, 33uF/200Vx1. I plucked the caps one by one with a plier twisting it round and round until it came off. We should exercise caution while doing this method, for not pulling the caps while twisting. Otherwise, the tracks will get torn. As this is a double sided PCB, it will complicate the troubles. We have to gently twist it round without pulling, upon which the legs would break off.
Why do I resort to this method? If we try to remove the caps otherwise, the long legs of the caps are likely to tear off the track inside the hole when we pull it. In this way, the caps will be off and we can use a tweezer to remove the cut leads by applying heat through a soldering iron from the bottom side. Then use a desolder wick to clean up the residual solder. The work will be very neat and clean. I also cut the leads of 33uF/200V capacitor and soldered new one (250V rating) on its cut leads. I did not remove the legs from the PCB, as the cap was mounted vertically. You can see that in the firs picture, portion of which is reproduced below:
Then I refit the board and applied power and adjusted the volume to full to check that the sound was ok. Then refit the TV and allowed it to run for a few hours before giving delivery.
Mission accomplished with satisfaction mixed with surprise getting added to the collection. Providing you proof of completion of work:
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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Tayo
September 28, 2024 at 12:14 pm
Very nice work Maestro.
Hope you and family are doing well.
Albert van Bemmelen
September 28, 2024 at 2:59 pm
Your method of twisting the cap legs without soldering to take them off can also be very useful on computer mainboards that too have multiple copper layers.
Never applied this method but will give it a try next time!
Parasuraman S
September 28, 2024 at 5:14 pm
I have done it before and shared the experience here too. Here you can watch this video:
Thanks for your expert comments, dear Albert!
Jim Whalen
September 29, 2024 at 2:55 am
Great video thanks
Parasuraman S
September 29, 2024 at 2:39 pm
Ok dear! You are welcome!
Anthony Paterson
September 28, 2024 at 3:02 pm
Parasuraman, I'm intrigued with your radial capacitor removal technique. I think you must mean you turn the capacitor a little bit clockwise then a little bit anti-clockwise and repeat until the leads are fatigued and break. Have I understood this correctly?
Parasuraman S
September 28, 2024 at 5:15 pm
No, just keep turning it in one direction only. You can have a look at the video, link of which I have shared with Albert above. Thanks!
Yogesh Panchal
September 28, 2024 at 3:18 pm
Sir, I removed SMD Electrolytic capacitors by twisting method but Never removed this Capacitors using twisting trick. i found this Video with amazing tricks to de solder through hole components easily without any spacial costly tools.
https://www.youtube.com/watch?v=Vou2xlJkuoU&t=137s
Parasuraman S
September 28, 2024 at 5:34 pm
Thanks, Yogesh Bai! I keep doing this trick many times in many boards. Thanks for the link too! Very useful!
Parasuraman S
September 28, 2024 at 3:48 pm
Yes, dear Tayo! We are doing fine! Many thanks for your comments and enquiry!
Waleed Rishmawi
September 28, 2024 at 4:35 pm
I use the same way to take out metal SMD capacitors sometimes either by twisting or by cutting the top of then add new capacitor to the pins left on board. thanks for sharing and as always have a blessed day
Parasuraman S
September 28, 2024 at 5:35 pm
Yes, all of us have different tricks with us which we find easier! Many thanks for your comments, dear friend!
Mark J
September 29, 2024 at 3:31 am
Parasuraman I learned method of capacitor removal today. Good job on the repair.
Parasuraman S
September 29, 2024 at 2:40 pm
Happy to note that it was useful! Many thanks for your comments!
Imoudu.O
September 30, 2024 at 5:47 am
I've been using this method too since I leant it from you and it works perfect.
Parasuraman S
October 1, 2024 at 10:02 pm
Thanks, dear Imoudu!