I failed to self repair my PC monitor. Help?
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!
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3 comentários
Hi @chris__ ,
Is the old capacitor an electrolytic type? I can't see any markings on it in the picture
If it is then perhaps this is a stupid question, but did you connect the new capacitor the right way? They are polarity conscious. You may notice the -ve marking on the side of the case of the new cap. There should hopefully be an indication on the pcb showing how to connect it.
Apologies if you know this.
If it is connected OK can only suggest that you check your work, for possible solder bridges and that you haven't disturbed any thing else during the course of the repair.
por jayeff
Thanks for your response, jayeff. I'm absolutely not sure of anything, now, because it's my first time doing something like this and it's failed. The opposite side of the old capacitor has these markings:
EA(M)105°
(C)0927
P E T
The service manual also has this part listed as "EC 105 C℃AP 1000UF M 25V 12.5 * 20MM" so I deduced that it was an aluminum electrolytic capacitor.
The board has polarity markings and I matched that up with the capacitor, the negative being the striped side with the negative marking and the shorter leg.
I continue checking to see if I can find any mistakes I've made, but this being my first time, I might not recognize a problem if I see it. Could I have damaged the internal circuitry with heat when I applied my soldering tool to remove the original capacitor?
Thanks again!
por Chris
Hi,old turkey is right,grab the specs and tester,and some beef jurkey and have fun.the web site i gave you is realy good at having sheets on a lot of components.
por shawn