Hello!
I know this is a common problem in this particular screen, but I have read all the threads about it but I still have the problem, where the backlight goes out after a few secs of working.
I got the monitor from a friend, whose dad already messed with this monitor - well, everything was bad on it, since he knows nothing about electronics. The PSU caps were all replaced with general purpose ones, and the inverter mosfets were so badly soldered, that the legs were literally shorted on them. All the inverter caps were general purpose too. The fuses were bad (2 of the 3). Ofc the backlight didn't even try to turn on at this point.. so I started to work on it.
So firstly, I replaced all the caps on the PSU with Low ESR ones.
Then I moved to the inverter board, where I replaced the fuses with 3.15A ones, all the mosfets had to go too, so I replaced them with ones I found equivalent on alltransistors.com
For testing, I kept the general caps on it, just to see if I can get something.
Well, yes, I could get an Acer logo with backlight, for about 0.5secs max. I knew that I am making progress, so I ordered Low ESR caps from the only hungarian electronics shop that is fairly okayish..
There should be 10x100uf 35V caps on the board, but since they didn't have them, I had to buy 2x220uf 35V for the voltage regulator area, and 2x470uf 35V for the mosfets area (so instead of 8x100uf its 2x470uf). I watched a youtube video where the guy did the same, and for him, it worked with only 4 caps on the board.. but just to have some spare, I ordered more.
The caps arrived today, they turned out to be Samxon GF, which, on the shop was labeled as Low ESR caps. So i soldered them on the inverter, and yes, now the backlight is working for longer, like 1-2 secs, but definitely turns off after it and refuses to come back. The display is working however, I can see the picture if I use a flashlight.
I was (I am) confused, so I installed the spare caps on the inverter too, all of them, even the 2200uf Teapo Low ESR ones I bought for another screen PSU, but still does the absolute same.. I can't seem to find what the problem is.
Do you have any ideas?
I know this is a common problem in this particular screen, but I have read all the threads about it but I still have the problem, where the backlight goes out after a few secs of working.
I got the monitor from a friend, whose dad already messed with this monitor - well, everything was bad on it, since he knows nothing about electronics. The PSU caps were all replaced with general purpose ones, and the inverter mosfets were so badly soldered, that the legs were literally shorted on them. All the inverter caps were general purpose too. The fuses were bad (2 of the 3). Ofc the backlight didn't even try to turn on at this point.. so I started to work on it.
So firstly, I replaced all the caps on the PSU with Low ESR ones.
Then I moved to the inverter board, where I replaced the fuses with 3.15A ones, all the mosfets had to go too, so I replaced them with ones I found equivalent on alltransistors.com
For testing, I kept the general caps on it, just to see if I can get something.
Well, yes, I could get an Acer logo with backlight, for about 0.5secs max. I knew that I am making progress, so I ordered Low ESR caps from the only hungarian electronics shop that is fairly okayish..
There should be 10x100uf 35V caps on the board, but since they didn't have them, I had to buy 2x220uf 35V for the voltage regulator area, and 2x470uf 35V for the mosfets area (so instead of 8x100uf its 2x470uf). I watched a youtube video where the guy did the same, and for him, it worked with only 4 caps on the board.. but just to have some spare, I ordered more.
The caps arrived today, they turned out to be Samxon GF, which, on the shop was labeled as Low ESR caps. So i soldered them on the inverter, and yes, now the backlight is working for longer, like 1-2 secs, but definitely turns off after it and refuses to come back. The display is working however, I can see the picture if I use a flashlight.
I was (I am) confused, so I installed the spare caps on the inverter too, all of them, even the 2200uf Teapo Low ESR ones I bought for another screen PSU, but still does the absolute same.. I can't seem to find what the problem is.
Do you have any ideas?
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