I have a Philips 150P4 LCD monitor that someone gave to me as faulty.
The power light is steady green, but no display unless I press the power button on the monitor off and then on again, but even then, not every time I do this will the display come on, it depends on the mood of the LCD monitor. Sometimes this trick works, sometimes it doesn't. Anyway, please read on to understand more about this monitor...
Earlier on, upon opening up the monitor to check the circuit boards inside, I noticed that there were no swollen capacitors at all, neither were there any blown fuse or blown resistors. Everything looked OK.
I don't have a multimeter, neither am I competent enough to know hoe to use one, but I do know how to look for swollen caps and replace them, and I have done so successfully in the past with motherboards. Anyway, enough background information about me. While performing a physical inspection of the monitor, I discovered the following problem: One of the pins in the VGA cable(the end which is supposed to go to the PC) was very badly bent. I assume the previous owner never realised this all this while and this was probably why the monitor became faulty. Anyway, I replaced it with a brand new VGA cable but the problem is still the same - the power light is steady green, but no display unless I press the power button off and then on again, but even then, this trick dos not work every time.
I noticed something else interesting - if the display was working, it would go off if there was a signal change, so to speak. For example, if I boot up Linux Mint, there would not be a display until all the BIOS startup and what-nots and all the boot-up information page 'switching' was done and the OS has finally settled down, THEN only will the 'switch-off-switch-on' trick work. If I tried the trick earlier during the boot-up process, most of the time the display would not come on. Also, sometimes for no apparent reason, the 'Lightframe' function blue button LED would momentarily light up for a second(when there is no display).
Now, in conclusion, here is my suspicion of what I think is wrong and I would like someone here to give me your second opinion. I suspect that the many years of using the LCD monitor by the previous owner with a damaged VGA cable with a badly bent pin has somehow shorted or caused irreversible damage to the LCD's display board. I suspect the problem is a faulty display board, since the power board looks fine to me, plus the power light is always steady green, meaning the power supply board should be OK. I suspect the problem is a faulty display board(even though there are no swollen caps or burnt components on it), rather than the power board.
What do you think?
Just to add on, I have already tested this faulty Philips LCD monitor with a few different computers(with different graphics cards, obviously), all the same problem.
The power light is steady green, but no display unless I press the power button on the monitor off and then on again, but even then, not every time I do this will the display come on, it depends on the mood of the LCD monitor. Sometimes this trick works, sometimes it doesn't. Anyway, please read on to understand more about this monitor...
Earlier on, upon opening up the monitor to check the circuit boards inside, I noticed that there were no swollen capacitors at all, neither were there any blown fuse or blown resistors. Everything looked OK.
I don't have a multimeter, neither am I competent enough to know hoe to use one, but I do know how to look for swollen caps and replace them, and I have done so successfully in the past with motherboards. Anyway, enough background information about me. While performing a physical inspection of the monitor, I discovered the following problem: One of the pins in the VGA cable(the end which is supposed to go to the PC) was very badly bent. I assume the previous owner never realised this all this while and this was probably why the monitor became faulty. Anyway, I replaced it with a brand new VGA cable but the problem is still the same - the power light is steady green, but no display unless I press the power button off and then on again, but even then, this trick dos not work every time.
I noticed something else interesting - if the display was working, it would go off if there was a signal change, so to speak. For example, if I boot up Linux Mint, there would not be a display until all the BIOS startup and what-nots and all the boot-up information page 'switching' was done and the OS has finally settled down, THEN only will the 'switch-off-switch-on' trick work. If I tried the trick earlier during the boot-up process, most of the time the display would not come on. Also, sometimes for no apparent reason, the 'Lightframe' function blue button LED would momentarily light up for a second(when there is no display).
Now, in conclusion, here is my suspicion of what I think is wrong and I would like someone here to give me your second opinion. I suspect that the many years of using the LCD monitor by the previous owner with a damaged VGA cable with a badly bent pin has somehow shorted or caused irreversible damage to the LCD's display board. I suspect the problem is a faulty display board, since the power board looks fine to me, plus the power light is always steady green, meaning the power supply board should be OK. I suspect the problem is a faulty display board(even though there are no swollen caps or burnt components on it), rather than the power board.
What do you think?
Just to add on, I have already tested this faulty Philips LCD monitor with a few different computers(with different graphics cards, obviously), all the same problem.