Shutting down and ticking noise in Proview LCD screen repaired. Model 900G
The main complaint with this LCD computer monitor was shutting down. I plugged it in and there was ticking sound in the speakers before it went into shuts down. Power it off and then turn it again, it will work for a few minutes sometimes one hour then it shuts down again.
I took the cover off and the first thing that I saw was the black spot on the board. It was in the power supply area. That was my repair starting point.
The first thing that I notice in this area was the dry joint and right away I started re soldering that area. Then I continued to check the rest of the board for bad soldering joints. There were plenty of them. I had to re solder every soldering joint on this board. The moment I was done with that. I powered up the LCD screen and the ticking noise was gone but it lasted only a few minutes then it went into shut down.
This was the time to use the ESR meter and look for bad capacitors. I started in the primary section area of the power supply and found a bad capacitor there. It was 22uf/50 volts. When I tested with the ESR meter, there was no reading what so ever. I continued to look for bad capacitors but I could not find any more. I replaced it.
I put the LCD screen back together and powered it up. Like I said before, the ticking was gone but this time, it did not shut down.
To be honest with you, I was expecting to find more bad capacitors on that board but I did not. I was shocked to see that this small tiny 22uf/50 volt was the main cause of this shutting down. Sure, the dry soldering joints was also a cause but it did not cause that much because when I re soldered all the dry joints and powered up the LCD screen, only the ticking was gone. Still, it went into shut down.
The field of electronics is wide and deep and every day I learn new thing. Let us keep an open mind and expand our knowledge in Electronics. See you in the next repair article.
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. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
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