Hello,
I have a problem with a LCD monitor, i will describe it below.
The monitor displays the image from pc (VGA) but it shakes it horizontally. There are horizontal lines all over the image that move left-right for approx. 1-2 centimeters, vizible at the side. Basically, the entire image is moving left and right line by line simultanously.
The monitor itself is a Samsung SyncMaster 720N, 17 inch, 3 years old.
The most interesting fact is that the OSD of the monitor is displayed correctly, without any distorsion. So only the image that comes from pc is displayed wrong.
Now, regarding the tests i've made:
- i've tested on 2 latops and 2 desktop computers
- i've tested using 2 different VGA cables
- i've tested using different resolutions and refresh rates (from 800x600 to 1280x1024 and from 60Hz to 100Hz). the effect is the same, only on 100Hz refresh rate the horizontal shake of the image is much more strong, the lines move faster and longer.
- i've tested with different power lines and outlets, one in my house, other in a friend house (i've read some forums where they've suggested that).
- the autosetup function of the monitor doesn't change anything
- i've opened the monitor, i've checked the capacitors and the other components, they do not present any visual sign of malfunction (like leeky capacitors or exploded), some say that an electrolitic capacitor may be dead, but i dunno how to test for it (all i got is a MAVO)
- i've measured the voltage on the power supply board, there are 2 wires for +5V, one for +2V, ground and sleep, all measure ok.
- the chip from the logical board is tsum16al-lf. i've googled it but found nothing other than it's made in China and costs approx 40 euros (which basically, if this is the damaged component, would make the replacement unpractical, the cost of the chip is almost a third from the price of a new monitor)
I am curios to know what can be the problem, especially because the OSD is displayed correctly. So maybe somenthing in the analogue-digital convertor? (from VGA to digital).
I am more interested in knowing the cause of this malfunction for pedagogical reasons.
myke.
I have a problem with a LCD monitor, i will describe it below.
The monitor displays the image from pc (VGA) but it shakes it horizontally. There are horizontal lines all over the image that move left-right for approx. 1-2 centimeters, vizible at the side. Basically, the entire image is moving left and right line by line simultanously.
The monitor itself is a Samsung SyncMaster 720N, 17 inch, 3 years old.
The most interesting fact is that the OSD of the monitor is displayed correctly, without any distorsion. So only the image that comes from pc is displayed wrong.
Now, regarding the tests i've made:
- i've tested on 2 latops and 2 desktop computers
- i've tested using 2 different VGA cables
- i've tested using different resolutions and refresh rates (from 800x600 to 1280x1024 and from 60Hz to 100Hz). the effect is the same, only on 100Hz refresh rate the horizontal shake of the image is much more strong, the lines move faster and longer.
- i've tested with different power lines and outlets, one in my house, other in a friend house (i've read some forums where they've suggested that).
- the autosetup function of the monitor doesn't change anything
- i've opened the monitor, i've checked the capacitors and the other components, they do not present any visual sign of malfunction (like leeky capacitors or exploded), some say that an electrolitic capacitor may be dead, but i dunno how to test for it (all i got is a MAVO)
- i've measured the voltage on the power supply board, there are 2 wires for +5V, one for +2V, ground and sleep, all measure ok.
- the chip from the logical board is tsum16al-lf. i've googled it but found nothing other than it's made in China and costs approx 40 euros (which basically, if this is the damaged component, would make the replacement unpractical, the cost of the chip is almost a third from the price of a new monitor)
I am curios to know what can be the problem, especially because the OSD is displayed correctly. So maybe somenthing in the analogue-digital convertor? (from VGA to digital).
I am more interested in knowing the cause of this malfunction for pedagogical reasons.
myke.