Hi friends,
I am here for asking for a little help with this monitor. It reacts to pressing the power button, but the only thing I get is working back light, with no picture. I was measuring all power voltages, you can see them in attached picture. There is 3.3V on the SPI ROM chip, and I can see healthy-looking communication on it ( pin 1 is changing ) after powering on. I can see nice clock signal on both crystals. I am even able to measure some low voltage data signals on LDVDS cable. So I believe, my issue in on the panel itself. I proved it by measuring VGH1 signal on a test point and saw, that voltage was initially high enough ( 31.2V ), then it felt down almost to 0V ), VGL1, is all time zero volts, only low negative spike around -1.6V, but it should be around -7V if I am not mistaken.
Now the question is - is it at least partially fixable, like in TV case, where you block some clock signals (SCK)? I have never done it in monitors, since I don't fix them often. There are too many flex cables going to the screen, and I have no idea, how to check faulty "part in the screen", which can I block ( if I ever can ). It is my monitor, so I don't mind, if it won't last too long, just want to save it.
Thank you for any suggestion, and feel free, if you need some additional information/photo/measurement.
I am here for asking for a little help with this monitor. It reacts to pressing the power button, but the only thing I get is working back light, with no picture. I was measuring all power voltages, you can see them in attached picture. There is 3.3V on the SPI ROM chip, and I can see healthy-looking communication on it ( pin 1 is changing ) after powering on. I can see nice clock signal on both crystals. I am even able to measure some low voltage data signals on LDVDS cable. So I believe, my issue in on the panel itself. I proved it by measuring VGH1 signal on a test point and saw, that voltage was initially high enough ( 31.2V ), then it felt down almost to 0V ), VGL1, is all time zero volts, only low negative spike around -1.6V, but it should be around -7V if I am not mistaken.
Now the question is - is it at least partially fixable, like in TV case, where you block some clock signals (SCK)? I have never done it in monitors, since I don't fix them often. There are too many flex cables going to the screen, and I have no idea, how to check faulty "part in the screen", which can I block ( if I ever can ). It is my monitor, so I don't mind, if it won't last too long, just want to save it.
Thank you for any suggestion, and feel free, if you need some additional information/photo/measurement.
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