Fixed LG LCD Color Monitor L1753S VGA port not work, Display screen show No Signal – A step by step guide improves the LG LCD Color monitor model L1753S based on a case study.
LCD Color Monitor
LCD color monitors are designed specifically for displaying images or visuals from a PC computer or laptop or other visual gear.
On every LCD monitor the monitor always comes with a VGA, DVI or HDMI port.
Due to various factors, the ports are sometimes damaged, both minor damage and heavy damage.
Damages such as broken or crooked on the ports.
LG LCD Color Monitor L1753S VGA port not work, Display screen show No Signal
In the case sudy I do, we are doing on LG brand LCD monitor with L1753S model. Damage occurs on the VGA port DB 15 which can not receive signals from outside sources, but can display the OSD or display of the program in the LCD that is No Signal Display.
As is well known, the L1753S model lcd monitor from the LG manufacturer will display the NO Signal display when no connector cable is connected from the VGA port to the display source such as a PC computer for example.
Fixed LG LCD Color Monitor L1753S VGA port not work, Display screen show No Signal
To ensure that damage occurs on the LCD monitor’s color planes, not due to connector cable or visual signal sources, please try the following steps before deciding or to verify that the damaged is the LCD monitor.
The first step, Plug the end of the cable vga connector to the lcd monitor VGA port and the other end to the source visual signal.
If the display of signal sources such as windows from PC, it can not appear on the LCD monitor.
The second step, then try to replace the cable connector first, if the connector cable has been replaced but still no change, try to enter the signal source of other equipment, eg Laptop.
The third step, And after it turns out there is no change as well, then certainly there are problems on the LCD monitor.
In our case study, the damage was in the input line section for H-Sync (horizontal syncron) signal.
Damage is caused because there is a component in the form of a diode that is used to eliminate DC short signals, so that the Horizontal signal that serves to control the ic program is inhibited or not until it leaked to Ground.
After doing a short diode replacement, and try to turn on the lcd plane, it turns out the appearance of the PC computer is successful.
So in conclusion, if the H-Sync or V-Sync signal is interrupted, the image from another visual source can not be processed by the existing program ic on the mainboard color of the LCD monitor.
With the turn of the leaked diode, it has finished repairing LCD Color Monitor L1753S.
To support the improvement, schematic diagrams and component datasheets are needed, especially ic singles. For that please download service manual LG Color Monitor L1753S.