This LCD computer monitor was brought to me and the complaint was, a dead LCD with a flicking on and off stand by light. It had an external power supply and the moment I turned it on, a green stand LED start flashing on and off. I tested the external power supply and I could see a reading of 18 volts. To make sure that the external power supply was working fine. I add a 24 light bulb (car light bulb) to the socket of power supply and I could see the light bulb coming on steady which is an indication of a working external power supply.
Upon opening the LCD monitor cover, I headed directly to the power board inside and scanned the area looking for something bulged or burnet but I could not see anything like that. With the ESR meter, I checked all the capacitors on that board and found four bad ones that went high in ohm causing the LCD monitor not to work. Usually, I find bad capacitors inside but sometimes when replacing these bad capacitors, I find other problems with either the back lights or the inverter board.
This LCD monitor, came with a separate inverter board and it has only two small tiny capacitors on it and both of them checked fine. I checked the back lights in the LCD monitor and all of them checked ok. So hopefully nothing else is bad in this monitor.
I replaced all the bad capacitors on the board which were found in these locations:
After replacing all of these, I powered up the LCD monitor and I saw it coming to live with nice vivid colors. I connected it to my laptop and let it run for more than one hour and it worked very nicely.