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.
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.
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Note: You can check his previous repair articles in the link below: