An LCD monitor was brought to my shop today and the problem was shutting down after few minutes of operation. I hooked it up to my Laptop to see what kind of a shut down it is. Every few minutes, the led started flashing and the computer monitor shut down completely. I was glad to see that kind of shut down because that is usually problem in the power supply.
Upon opening the LCD screen, I started scanning for bad, bulged capacitors. That is usually the case when you have a shut down problem. I could not find any bulged capacitors. I started checking capacitors with the ESR meter and soon enough I found two bad ones in the power supply section. They were 47uf/35 volts.
I replaced them with new ones and fired up the LCD monitors and it worked for more than two hours. I was actually impressed with the quality of the picture on this screen. Although it was unknown brand name but the quality was amazingly shocking. It was kind of old LCD screen and the customer was not expecting this screen to come back to life. He was happy though and rewarded me generously.