Philips 190 P5 - How to enter service mode - SMPS and Audio Output schematic

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 :

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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.

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:

One lit red, green or blue sub pixel

Two adjacent lit sub pixels:
- 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'.

Note: 1 or 2 adjacent sub pixel defects = 1 dot defect