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Monitors

LG W2241S monitor without image but with backlight

Isel87
Isel87
5
hace 5 años
hace 5 años
Hello everyone, I have an LG W2241S to which I had to change the capacitors recently, it was working fine for a while and now it starts to fail again. The thing started like this : at first it failed to turn on, that is, you hit the button and as if you hadn't given it, but if you disconnected the power cord for a few seconds and went back to connecting it worked again and did not give any problems until it was turned off and the same thing happened within a day or two. But the other day when he went on he turned on the logo was shown and the screen went black and so on. What I have done so far: The first thing I looked at were the capacitors, first those of the secondary circuit (which I had replaced a few months ago) and then the fat one of the primary ( that had not replaced and choose to change it although it loaded and unloaded correctly). I didn't get anything so I went to check the inverter and the lamps. With the screen disassembled, plugged in and the lamps out I checked that although two had slight black marks they all turn on correctly and look evenly. I have mounted again but the result remains the same, the screen turns on, shows the logo and when the PC turns on it stays black but with recrimination active (the PC is not because I have tried it on another one). Well, things do not occur to me where to look, I would be very grateful if someone guides me or can give me some idea. A greeting and thanks in advance.
service2006
hace 5 años

I have solved some failure like this, raising the memory ...

Responder
leoner rivero
hace 5 años
hace 5 años
Hello friend, if I understood your screen correctly, it shows the logo and goes out ... if so, try this: place a 2kv ceramic capacitor in parallel to the connector of one of the lamps with the same disconnected, and turn on the monitor, of course with the other connected. If you do the same, exchange the capacitor. if the lamp where the ceramic is connected is working properly and you must replace it, test and comment result
Isel87
Isel87
5
hace 5 años

Specifically it stays on but without showing any image. I turn on the monitor and then turn on the PC, when the monitor receives the signal the screen goes black.
As for the lamps, my monitor has 2 up and 2 down, I took the 4 and lit them out and they all light up, can that still be? If so, I compared the capacitor that tells me and tried again. Would the result of inserting the capacitor be similar to bridging pin 1 of the FAN7314A inverter chip to ground to eliminate the protection of the board?
A greeting and thanks for answering

Responder
leoner rivero
hace 5 años

ok there are 4, just do it one by one, disconnect one and where that lamp is connected, place the ceramic capacitor, normally they are blue, you must have many on TV boards, 2 kv or 2000 volts, so you discard the lamps,

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Isel87
Isel87
5
hace 5 años

I tried what you told me days ago (it took me a while to get the capacitor) and I don't get any changes, the monitor keeps on turning on and it goes black with some small variation of lighting but without showing image. Thanks for the idea too. Can you think of anything else to keep looking at? I thought it could be the video plate of the monitor itself ... but no idea so far.
Greetings.

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Isel87
Isel87
5
hace 5 años
hace 5 años
Good afternoon, the problem is already solved. The fault was in the VGA controller board, the new board is worth € 8 (about $ 9) by Aliexpress in case someone has the same problem. Greetings.
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