An LCD TV That Keeps Shutting Down Repaired. Model: LG 32LG80UR-TA
A lawyer brought this LCD TV for repair. The main fault is the TV keeps shutting down. Sometimes it stays on for an hour sometimes it shuts down in one or five minutes.
I powered it on in my shop and sure enough in less than five minutes, it went into shut down. I turned back on but the power LED light was flickering which gave me the indication that the issue is in the power supply.
In my mind I was thinking either bad capacitor or simply bad soldering joints.
It looked decent on the inside, a little dust here and there so I dusted it all out with an air blower set to medium speed because I do not want component flaying away with the strong air blowing.
The first thing I checked was for bad bulged capacitors. I tested all of them with my trusty ESR meter and found everything according to specs.
As I was testing the capacitors with my ESR meter, I noticed a lot of bad soldering joints some bad and some ok but needed a touch of solder.
If you look closely to these soldering joints especially the far lower left you would see really cracked solder joint. Other were ok but I re soldered all of them.
These are two pins of a capacitor that were completely cracked so I re soldered that as well.
All these marked spots had cold soldering joints and had to be reworked on it. Some cold soldering joints I was able to see with my naked eye and others I had to use my microscope in order to see and get fixed. I carefully went all over the joints here and when I was done with that I gave it a nice clean with alcohol and it looked really nice.
I also checked the main board for cold soldering joints just to make sure but on that board everything was fine except some minor spots here and there but it was much better than the power board.
Finally, I powered on the TV. I hooked it to my satellite receiver and let it run for the whole day and the TV was fixed. It did not shut down.
I called the customer to come and pick up his TV. When he showed up to my shop, he brought something else for repair.
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: