Power Supply Regulator - Audio output circuit diagram, Factory mode (Service Mode), Aging mode - Philips 19 inch TFT LCD monitor - OSD lock-Unlock
To Lock/Unlock OSD function (User Mode)The OSD function can be locked by pressing "OK" button for more than 10 seconds, the screen shows following windows for 3 seconds.
Every time when you press "AUTO" or "OK" button, this message appears on the screen automatically.
Unlock OSD function:
Locked OSD function can be released by pressing "OK" button for more than 10 seconds again.
Access Aging.. Mode
Turn off LCD monitor, and disconnect Interface Cable between
Monitor and PC.
Push AUTO & OK buttons at the same time and hold it ] +
[Press power button until comes out
"AGING screen" ] => then release all buttons.
After 15 seconds, bring up :
----------
----------
repeat
Connect signal cable again => go back to normal display.
----------
repeat
Connect signal cable again => go back to normal display.
Factory mode
Turn off monitor.
[Push AUTO & OK buttons at the same time and hold it ] +
[Press power button until comes out "Windows screen" ] => then
release all buttons.
Press OK button, bring up Factory mode indication.
Factory menu
Cursor can move on gray color area.
Hot key function: by pressing "UP" and
"DOWN" key simultaneously at User mode (or Factory mode).
[Offset R G B function can be used on reduce or eliminate snowy
noise on the background when the resolution of video signal is 1280 X 1024
vertical 60Hz. Slightly increase or decrease the value until snowy noise
completely disappear]
SMPS schematic
Audio output schematic
Pixel Defect
pixel or sub pixel defects on the TFT LCD panels used in flat
panel monitors are sometimes unavoidable. No manufacturer can guarantee that
all panels will be free from pixel defects, but Philips guarantees that any
monitor with an unacceptable number of defects will be repaired or replaced
under warranty. This notice explains the different types of pixel defects and
defines acceptable defect levels for each type.
In order to qualify for repair or replacement under warranty,
the number of pixel defects on a TFT LCD panel must exceed these acceptable
levels. For example, no more than 0.0004% of the sub pixels on a 15" XGA
monitor may be defective. Furthermore,
Philips sets even higher quality standards for certain types or combinations of
pixel defects that are more noticeable than others. This policy is valid
worldwide.
Pixels and Sub pixels
A pixel, or picture element, is composed of three sub pixels in the primary colors of red, green and blue. Many pixels together form an image. When all sub pixels of a pixel are lit, the three colored sub pixels together appear as a single white pixel. When all are dark, the three colored sub pixels together appear as a single black pixel. Other combinations of lit and dark sub pixels appear as single pixels of other colors.
A pixel, or picture element, is composed of three sub pixels in the primary colors of red, green and blue. Many pixels together form an image. When all sub pixels of a pixel are lit, the three colored sub pixels together appear as a single white pixel. When all are dark, the three colored sub pixels together appear as a single black pixel. Other combinations of lit and dark sub pixels appear as single pixels of other colors.
Types of Pixel Defects
Pixel and sub pixel defects appear on the screen in different ways. There are two categories of pixel defects and several types of sub pixel defects within each category. Bright Dot Defects appear as pixels or sub pixels that are always lit or 'on'. These are the types of bright dot defects:
Pixel and sub pixel defects appear on the screen in different ways. There are two categories of pixel defects and several types of sub pixel defects within each category. Bright Dot Defects appear as pixels or sub pixels that are always lit or 'on'. These are the types of bright dot defects:
One lit red, green or blue sub pixel
Two adjacent lit sub pixels:
- Red + Blue = Purple
- Red + Green = Yellow
- Green + Blue = Cyan (Light Blue)
- Red + Blue = Purple
- Red + Green = Yellow
- Green + Blue = Cyan (Light Blue)
Three adjacent lit sub pixels (one white pixel)
Black Dot Defects
Appear as pixels or sub pixels that are always dark or 'off'.
Appear as pixels or sub pixels that are always dark or 'off'.
Note: 1 or 2 adjacent sub pixel defects = 1 dot defect.
