An LCD TV Keeps Shutting Down Repaired
A bus driver that works for an international organization brought his LCD TV for repair. He said that he liked this TV and he wants it repaired. The main issue was it shuts down after a while. I tested it in my shop for about ten minutes and sure enough, it shut down for some reason.
It is a German made LCD TV and it is a heavy one but for some reason the customer wanted to get fixed and maintained.
My thoughts were either, bad capacitors, bad soldering joints or maybe both, let us find out.
First I saw a lot of cold soldering joints all over the power board and first thing was to re solder these entire bad joint and hope for the best.
After I while of touching up all these soldering joints with fresh solder, I tried the TV for a while and it did not shut down. So I called the customer to come and pick up the TV. As I was about to do that, the TV went into shut down again after one hour of running.
At this time I got my ESR meter out and tested every capacitor on that board and I found some with high ESR readings and some capacitors were also open.
I found these bad capacitors on that power board of the LCD TV. After replacing them all, I tested the TV but this time the TV was on for the whole day and it did not shut down.
To be sure of the repair, I kept the TV in my shop the next day and I turned it on early in the morning. My shop usually gets cold at night and that should effect the powering on the TV if there are still bad capacitors on the power board. So first thing in the morning, I powered on the TV and the LED standby came on and when I pressed the power button it was on for a while.
So I can know now beyond a shadow of doubt that is TV is fixed. I called the customer and he picked up his TV with a big smile on his face.
Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.
Note: You can check his previous repair articles in the link below:
https://jestineyong.com/a-drill-battery-charger-shorted-out-maintained-and-repaired/
(79)Dislikes
(0)
14 Comments
Leave a Reply
Albert van Bemmelen
January 12, 2021 at 9:01 pm
Fixing this heavy German made Schneider tv after replacing 9 bad e-caps and many bad solder joints was indeed another good Mission Accomplished! As these kind of failures are more difficult to find and solve.
Andrew F. Ali
January 12, 2021 at 9:14 pm
Well done. Takes a lot of patience some of these problems to rectify.
Waleed Rishmawi
January 12, 2021 at 10:18 pm
Andrew: thanks man. yes patience was my moto otherwise I would not have passed this challenge. have a good day
Waleed Rishmawi
January 12, 2021 at 10:15 pm
Albert: it has a challenge but I came on top. it was not easy..have a good day
Parasuraman S
January 12, 2021 at 10:07 pm
Well your patience, caution and perseverance paid! Good job there!
Waleed Rishmawi
January 13, 2021 at 2:49 pm
Parasuraman: yes, it was a hard one that took a long time to get fixed due to the length of the TV shutting down. it was a real challenge but it is fixed and that what counts. have a good day
babu ms
January 13, 2021 at 12:25 am
Had a good knowledge,that power supply board fault create shutdown problem.Thank you very much for sharing.
Waleed Rishmawi
January 13, 2021 at 2:49 pm
Babu: you are most welcome. have a good day
Gassan Ali
January 13, 2021 at 1:38 am
I got such a TV with the same symtoms and I wasn't able to repair and it ended up getting returned to the customer. I suspected the processor on the logic board because it was hotter than the restof the components. Now I'm think differently. Perhaps the processor was suppoesed to that much hot and it normally is like that in all devices. The the problem could've been the caps. Thank you for the article. My approach will be differnt next time.
Waleed Rishmawi
January 13, 2021 at 2:51 pm
Gassan: in a situation like this an ESR meter comes handy and that is the first thing to check..sometimes we look and think that is a hard one but in reality it is simpler that we thought. have a good day
Mark
January 13, 2021 at 6:01 am
Well done Waleed,
Those caps can be a headache at times.
Waleed Rishmawi
January 13, 2021 at 2:52 pm
Mark: they are headache always..LOL have a good day
Yogesh Panchal
January 13, 2021 at 6:16 pm
Good job! Waleed.
Recently i have received some repair jobs many of them are dry solder problem.
Waleed Rishmawi
January 16, 2021 at 4:58 pm
Yogesh: thanks man. that is mostly the case, dry joints and high ESR capacitors. have a good day