Chosen Solution
One of my monitors, a AOC 2330Fz, recently stopped showing anything on screen, although it would power on and my PC would recognize it as a working display. After some research, and some examination, I learned that the backlight had stopped working , but the LCD was still functional. Reading further into it, the probable cause was a bad capacitor(s) on the power supply board, so I opened up the monitor and found one visibly damaged capacitor. I ordered some 1000uf 25v Electrolitic capacitors that I thought would be suitable replacements for the bad 1000uf 25v Electrolitic capactitor that I found on the board. These are the ones I ordered. When I received these capacitors, I noticed that they are a little smaller than the bad capacitor, but I went ahead and replaced it anyway. Now, my monitor seems to have a working backlight, but an entirely new problem. When I plug in the power to the monitor, it tries to power up. It lights up for less than a second and then there is a very faint click sound that comes from the power supply board and the monitor shuts off, briefly, then tries to power on again and continues to cycle this way. TLDR - I replaced a capacitor on my monitors power supply board in order to fix the backlight. Now my monitor tries to power on, shuts off in less than a second, tries to power on again, and continues in the pattern. Did I do something wrong in my repair? What might be causing this new problem? Thanks!
@chris__ I agree with shawn on this. It is not your capacitor that is at fault. Your capacitor is the right one and your soldering is proper and so is the polarity. the clicking is normal as well since it does try to turn your monitor on. Your capacitor blew because of something not working right. I usually do not replace just one capacitor but recap the complete PSU as well as replace the power IC’s Q805 and Q806 on your board. . You can check the PWM controller LD7576 IC901 on your board. To check those components download the datasheet for those. Since you are new to this type of repair it may take you awhile but it is ultimately a good learning opportunity. Just in case you fail, replacement boards are relatively inexpensive and readily available.Microsoft Word - LD7576-DS-03.docAO4620_Rev8_RoHSx
IT sounds like you did good but the cap is the simtem not the cause.there is a voltage regulator that is bad.unfortunatly i do not know wich one on that unit.find the schematic to solve issue.There are a lot of heat sensative components and electrolytics are one of many so be careful.bad caps are usualy puffy on top.you need to run tests to find the bad ic chip.you can get component specs from alldatasheets.com
Hi, the only thing that I would suggest is to try to get the EXACT capcitors that were factory fitted on the board and see if it help (most likely that it won’t). I’m confused by the clicking noise from the power supply though, the only clicking that I would’ve thought it might’ve been would be a relay but I don’t think they’re present in a power supply, that’s weird. But hope you find a solution soon! Also, double check you haven’t accidentally put solder on other tracks on the board! Good luck.
