AOC F1905E Service Manual

HP F1905E

SERVICE MANUAL

19 LCD Monitor

F1905E Series

THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

		HP F1905E
	Table of Contents
Table of Contents ----------------------------------------------------------------------------------		02
Revision List ----------------------------------------------------------------------------------------		04
1.Product Feature --------------------------------------------------------------------------------		05
2.LCD Monitor Description -----------------------------------------------------------------------		05
3.Operation Instructions --------------------------------------------------------------------------		06
3.1 General Instructions -----------------------------------------------------------------------		06
3.2 Control Button -------------------------------------------------------------------------------		07
3.3 Adjusting The Picture ---------------------------------------------------------------------		08
4. Input/Output Specification ---------------- ---------------------------------------------------		09
4.1 Input Signal Connector --------------------------------------------------------------------		09
	4.1.1 Analog D-SUB Connector --------------------------------------------------------	09
	4.1.2 DVI-D Digital connector -------------------------------------------------------------	09
4.2	Factory Preset Display Modes ----------------------------------------------------------	10
4.3	Power Supply Requirements ------------------------------------------------------------	11
5.Panel Specification ---------------------------------------------------------------------------		11
5.1	General Feature ----------------------------------------------------------------------------	11
5.2	Optical Characteristics --------------------------------------------------------------------	12
6. Block Diagram -----------------------------------------------------------------------------------		13
6.1	Monitor Exploded View ------------------------------------------------------------------	13
6.2	Software Flow Chart -----------------------------------------------------------------------	14
6.3	Electrical Block Diagram -----------------------------------------------------------------	16
6.3.1 Scalar Board -------------------------------------------------------------------------		--16
6.3.2 Inverter/Power Board ----------------------------------------------------------------		17

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			HP F1905E
7. Schematic -----------------------------------------------------------------------------------------			19
7.1 Main Board -----------------------------------------------------------------------------------			19
7.2		Inverter/Power Board -------------------------------------------------------------------	23
8. PCB Layout ---------------------------------------------------------------------------------------			26
8.1		Main Board -----------------------------------------------------------------------------------	26
8.2		Inverter/Power Board ----------------------------------------------------------------------	27
8.3 Keypad Board -----------------------------------------------------------------------------			30
9. Maintainability ------------------------------------------------------------------------------------			31
9.1		Equipments and Tools Requirements -------------------------------------------------	31
9.2 Trouble Shooting ---------------------------------------------------------------------------			32
		9.2.1 Main Board ------------------------------------------------------------------------	32
		9.2.2 Power/Inverter Board -------------------------------------------------------------	35
		9.2.3 Key Pad Board -----------------------------------------------------------------------	37
10.	White-Balance, Luminance Adjustment -----------------------------------------------		38
12.	Check List After Replacing LCD Main Board ---------------------------------------------		40
13.	EDID Content -----------------------------------------------------------------------------------		44
14.	BOM List -----------------------------------------------------------------------------------------		45

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		Revision List
		TPV model name
Revision	Date
A00	May.-09-06	T986KAVDKHHPAP

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1.Product Feature

48.3cm (19”) a-si TFT Active matrix LCD panel, 0.294mm dot pitch Scalar chipset: Genesis GM5321

Microprocessor controlled scan technology

Both VGA analog and DVI-D digital signal video inputs supported 450:1 Typical Contrast Ratio and 250-nits typical Brightness

Response time 20ms and Viewing Angle 140(Horizontal) and 120(Vertical) 15 factory presets, 10 user modes

Vertical refresh rate 50Hz to 76Hz; Horizontal frequency 30kHz to 83kHz Resolutions: 640 x 480 up to 1280x1024, Max Pixel Modes: 140 MHz Power Internal AC100V-240V

Tilt -5° to 35° CE mark TCO 03 mark

VESA DPMS compliant

VESA DDC2B compliant and DDC/CI interface.

2.LCD Monitor Description

The LCD Monitor will contain main board, power board, key board which house the flat panel control logic, brightness control logic and DDC.

The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.

Monitor Block Diagram

	CCFT Drive.			Flat Panel and
				CCFL backlight

Power Board

Main Board

RS232 Connector

For white balance

adjustment in

factory mode

Keyboard

AC-IN

Video signal, DDC

HOST Computer

100V-240V

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3. Operation Instructions

3.1 General Instructions

Press the power button to turn the monitor on or off. The other control buttons are located on the side of the front panel. By changing these settings, the picture can be adjusted to your personal performance.

-The power cord should be connected and insert to adaptor.

-Connect the video cable from the monitor to the computer VGA card.

-Press the power button to turn on the monitor, the power indicator will light up to Green.

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3.2 Control Buttons

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3.3 Adjust the Picture

1.		Brightness	Adjust the brightness.
2.		Contrast	Adjust the contrast
			Adjust the:
			Auto Adjustment: Adjusts the main settings and produces a stable, centered
		Image	image.
			H-Position: horizontal position of the screen image.
3.		Control
			V-Position: vertical position of the screen image.
			Clock: frequency of the pixel clock to minimize vertical bar.
			Phase: phase value to minimize horizontal jitters.
			9300K: recall 9300K color
			6500K: recall 6500K color
4.		Color	SRGB: recall SRGB color
			Custom Color: adjusts the color tint of white, and the red, green, and blue (RGB)
			mix for colors.
5.		Language	Shows the language of the OSD window.
			Power Saver: enable/disable power saving
			Power On Recall: enable/disable power recall
6.		Management	Mode Display: enable/disable mode display
			Sleep Timer: set sleep timer
			Basic Menu: set to basic menu
7.		OSD Control	OSD (on Screen Display) settings: adjusts the H/V position, timeout, On Screen
			Display window.
8.		Information	Current setting, recommended setting, serial number, total hours, backlight hours,
			Exit.
9.		Factory	Resets the display to original factory settings for color, brightness, phase, and clock.
		Reset
10.		Exit	Exit the current OSD window.

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4. Input/Output Specification

4.1 Input Signal Connector

4.1.1 Analog D-SUB Connector

PIN	MNEMONIC	SIGNAL	PIN	MNEMONIC	SIGNAL
1	RV	Red Video	9	+5 V	+5 V (from PC)
2	GV	Green Video	10	SG	Sync Ground
3	BV	Blue Video	11	NC	None (Reserved for Factory Use)
4	NC	None	12	SDA	DDC Data
5	GND	Ground (DDC Return)	13	HS	Horizontal Sync
6	RG	Red GND	14	VS	Vertical Sync
7	GG	Green GND	15	SCL	DDC Clock
8	BG	Blue GND

VGA connector layout

PIN 1	PIN 5
PIN 11

4.1.2 DVI-D Digital connector

	PIN	MNEMONIC	SIGNAL	PIN	MNEMONIC	SIGNAL
	1	TX 2 -	TMDS Data 2 -	13	TX 3 +	TMDS Data 3 +
	2	TX 2 +	TMDS Data 2 +	14	+5V	+5V Power (from PC)
	3	SHLD 2 / 4	TMDS Data 2 / 4 Shield	15	GND	Ground (Return for +5V)
						Hot Plug Detect (connect internally to
	4	TX 4 -	TMDS Data 4 -	16	HPD
						pin-14)
	5	TX 4 +	TMDS Data 4 +	17	TX 0 -	TMDS Data 0 -
	6	DDC Clk	DDC Clock	18	TX 0 +	TMDS Data 0 +
	7	DDC Data	DDC Data	19	SHLD 0 / 5	TMDS Data 0 / 5 Shield
	8	N/C	No Connect	20	TX 5 -	TMDS Data 5 -
	9	TX 1 -	TMDS Data 1 -	21	TX 5 +	TMDS Data 5 +
	10	TX 1 +	TMDS Data 1 +	22	TX CLK SHLD	TMDS Clock Shield
	11	SHLD 1 / 3	TMDS Data 1 / 3 Shield	23	TX CLK +	TMDS Clock +
	12	TX 3 -	TMDS Data 3 -	24	TX CLK -	TMDS Clock -

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DVI-D digital connector layout

4.2 Factory Preset Display Modes

Factory Pre-set Video Input Modes

	Pre-set	Pixel Format	Horizontal	Vertical Frequency
			Frequency (kHz)	(Hz)
	1	640 x 480	31.5	60.0
	2	640 x 480	37.9	72.0
	3	640 x 480	37.5	75.0
	4	720 x 400	31.5	70.0
	5	800 x 600	37.9	60.0
	6	800 x 600	48.1	72.0
	7	800 x 600	46.9	75.0
	8	832 x 624	49.7	75.0
	9	1024 x 768	48.4	60.0
	10	1024 x 768	56.5	70.0
	11	1024 x 768	60.0	75.0
	12	1152 x 900	68.7	75.6
	13	1152 x 900	71.7	76.0
	14	1280 x1024	63.9	60.0
	15	1280 x1024	80.0	75.0

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4.3 Power Supply Requirements

PARAMETER	RANGE
AC Input Voltage	90 to 265V
AC Input Frequency	47 to 63 Hz
Inrush Current	50A MAX AT 220VAC and 30A AT 120VAC
Leakage Current	5 mA MAX at 120VAC
Power consumption	<70W

5.Panel Specification

5.1General Feature

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5.2 Optical Characteristics

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6. Block Diagram

6.1 Monitor Exploded View

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6.2 Software Flow Chart

1

Y

2

3

N

4

5	N
Y
6

N

7 8

Y

9

	10	N	11
	Y
N	12		13	N
	Y		Y
	14		15	N
				16
			Y
			17

18 N 19

Y

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REMARK:

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?

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6.3 Electrical Block Diagram

6.3.1 Scalar Board Block Diagram

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6.3.2 Inverter / Power Board Block Diagram

Inverter Block Diagram

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Power Block Diagram

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