Frequently Asked Questions
When using the computer equipment and other electronic devices there may appear some problems you can solve on your own. Below, we present a set of the most frequent questions along with the answer. If the given information have not helped solve the problem please contact our service.
Most frequent problems:
- No functions in the device.
- No vision on the monitor.
- LEDs turn orange and there is no vision.
- No sound in the speakers.
- What does ISO 13406-2 concerning wrong pixels in the LCD panel mean?
- What do the particular errors on the panel look like?
- How to count the number of acceptable errors for a particular monitor?
No functions in the device.
- make sure the power cord is properly connected to the monitor and the socket.
- make sure there is power in the socket (e.g. through, plugging another working device).
- pull out the plug and after a while plug in (it is necessary for the remaining voltage to discharge in the electronic schemes).
No vision on the monitor.
- check if the VGA signal cable is properly connected with the monitor and the graphics card.
- check if the plugs' pins are not bent, the graphics card must be permanently installed in PC.
- check if the computer along with the graphics card works properly (e.g. connecting another monitor).
- make sure the monitor is on.
- check the graphics card set-up. You cannot exceed the maximum 1024x768 definition and 75 Hz frequency.
- pull out the plug and after a while plug in (it is necessary for the remaining voltage to discharge in the electronic schemes)
LEDs turn orange and there is no vision.
- check if the VGA signal cable is properly connected with the monitor and the graphics card.
- check if the plugs' pins are not bent, the graphics card must be permanently installed in PC.
- make sure the computer is not Stand By through moving a mouse or pressing the button.
No sound in the speakers.
- audio cable must connect the computer sound card Line Out socket with the monitor Line In socket.
- check if the audio cable is not defective (test with another audio cable).
- make sure the software and the sound card drives are properly configured.
- make sure the volume level and mute function are properly set.
What does ISO 13406-2 concerning wrong pixels in the LCD panel mean?
This norm defines a type and a number of potential wrong pixels out of one million pixels. It divides the TFT LCD panels into classes defining the number and the type of matrix defects.
Those defects may appear, but not necessarily, in a particular TFT panel. Their numbers and position determines the LCD monitors warranty terms and conditions. The below given numbers are the maximum ones in a particular class.
| Number of errors per one million pixels | Errors types | ||
|---|---|---|---|
| Panel class | Type 1 | Type 2 | Type 3 |
| I | 0 | 0 | 0 |
| II | 2 | 2 | 5 |
| III | 5 | 15 | 50 |
| IV | 50 | 150 | 500 |
Particular errors types define:
- Typ 1 - completely white pixel
- Typ 2 - completely black pixel
- Typ 3 - subpixel (red, green, blue or no blue)
If the errors appear close to one another in the area of 5x5 pixels, then an extra norm applies:
| Panel class | accaptable number of errors in the cluster | |
|---|---|---|
| Type 1 or 2 | Type 3 | |
| I | 0 | 0 |
| II | 2 | 2 |
| III | 5 | 15 |
| IV | 50 | 150 |
Cluster is a 5x5 pixels area.
What do the particular errors on the panel look like?
Below the fragment of the panel along with the potential errors are presented.
pixel
subpixel
One pixel (complete one) consists of three subpixels in red,green, blue colour. Each subpixel is driven by one transistor.
How to count the number of acceptable errors for a particular monitor?
The number of errors can be calculated by means of an appropriate proportion (number of errors = number of errors according to x number of pixels norm/1000 000) making it even always upwards. Below there are the calculations for the class II panels. One should have in mind that definition given in the chart is not the one which is being currently used but, so called, natural definition - definition based on the actual number of pixels on the screen.
| Panel | Resolutions | Pixels number | Acceptable errors number | ||||
|---|---|---|---|---|---|---|---|
| type 1 | type 2 | type 3 | type 1 or 2 in cluster | type 3 in cluster | |||
| 15" | 1024 x 768 | 768 432 | 2 | 2 | 4 | 0 | 2 |
| od 17" do 19" | 1280 x 1024 | 1 310 720 | 3 | 3 | 7 | 0 | 2 |
| od 20" do 24" | 1600 x 1200 | 1 920 000 | 4 | 4 | 10 | 0 | 4 |
If the problem has not been solved, please contact MAKOR Service Center. YOU CAN NEVER FIX A MONITOR ON YOUR OWN.
