No Power In LG TV Repaired
The complaint of this LG CRT TV was no power and as usual the first thing to do is to check on the main fuse. Before I could access to the main fuse, I found that the circuit board was full of dust thus I cleared all dust first by using a vacuum cleaner before checking on the main fuse.
The main fuse was checked to be good so I had to turned the circuit board so that I can check on the components from behind the board.
Before started to check on the components I already saw the cause of the no power problem. It was due to dry joint in the on/off power switch- see the photos below:
This had caused an open circuit thus there were no supply current to the whole circuit board. In order to solve this problem, I applied fresh solder onto the joints and rechecked on the circuit line to make sure there are contacts between the points.
After that I powered up the circuit board without using the light bulb trick because I knew that the only cause of the problem was dry joint and no other causes.
The power LED was lighted up.
I turned off the power and put everything back to its position and powered it up again. Look at the display in the photo below:
It was an easy repair job. However, if you want to learn more in depth of CRT TV Repair, you can check out Humphrey’s website HERE.
All the best to you.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with us, please contact us HERE.
P.S- If you enjoyed reading the above article, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
Note: You may check out previous post about fixing active speaker in the below link:
https://www.electronicsrepairfaq.com/no-signal-in-konka-led-tv-repaired
About admin
Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com
14 comments on “No Power In LG TV Repaired”
Leave a Reply
Leave a Reply
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Very good!
Nice find. Easy fix. A simple job well done.
Thank you for the post.
Mason
Good and easy job. I guess those dry joints will be much harder to find now that we use leadfree solder (with silver and other active flux instead).
The flux in lead-free solder is much more active than the old rosin (literally pine sap) flux in the leaded solder like in this old LG CRT TV. Lead solder shines after it is cooled down and the lead free does not (looks like a dry joint). Also the lead-free flux is much more irritating to our eyes and respiratory tract. And unless you use no-clean flux, the flux must be cleaned from the board or it will corrode the metal.
Commendable job. Keep it up. We all follow your idea keenly.
… Very helpful.
Suranga ,
Good Quick Fix!!
Good sir very informative
Thank you for the post
NICE ONCE.IS A GOOD JOB
Nice and straightforward service,thanks.
I want to say thanks a lot and you have changed my life know am technically because of you
my sony crt tv KV-AR68M 29 inches is having horizonal problem. on the right side of the screen a black bar of 4 inch from top to bottom .voltages are ok. checked the pf capcitors near HOT transisitor are ok .what could be the problem.
Good thank you
I am very interested in electronics maintenance but no access of materials in Ethiopian but your expiration on the above figure