HP LP2275w – AOC LP2275w – 22inch LCD Color Monitor – Power Board – Circuit Diagram – 715G2966A

SMPS board schematic – AOC and HP LP2275w – 22 inch LCD Monitor – 715G2966A

Horizontal Frequency - 30- 93 kHz

SMPS and BACK LIGHT INVERTER SCHEMATIC

Software Flow

1) MCU initialize.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
Scalar initialize.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are they’re any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

Product features

Feature	Description
Part number	KE289A4
Type	22-in (55.9 cm) Wide-Aspect Active Matrix TFT (thin film transistor)
Viewable Image Area	22 in (55.9 cm) widescreen; diagonally measured
Screen Opening (W x H)	18.87 x 11.7 in (47.5 x 29.8 cm)
Viewing Angle (typical)	Up to 178° horizontal / 178° vertical (10:1 minimum contrast ratio)
Brightness (typical)*	300 nits (cd/m²)
Contrast Ratio (typical)*	1000:1
Response Time (typical)*	< 6 ms (gray to gray), 16 ms (On/Off)
Pixel Pitch	0.282 mm
Backlight Lamp Life (to half brightness)	30K hours
Color Gamut	HP Vivid Color support (92% color gamut)
Self Powered USB 2.0 Hub	One upstream, four downstream ports (cable included)
Native Resolution	1680 x 1050 @ 60 Hz (WSXGA+), 1.76 Million pixels
Best features	Tilt Range: -5° to + 30° vertical Swivel Range: -45° to + 45° Height Adjustable: Yes, range 3.9 in (10.0 cm) Pivot Rotation: Yes