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F1905E
Service Manual
58 pgs1.6 Mb0

AOC F1905E Service Manual

HP F1905E
SERVICE MANUAL
19〞LCD Monitor
F1905E Series
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 S pecification ---------------- --------------------------------------------------- 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
2
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
3
Revision List
Revision Date TPV model name
A00 May.-09-06 T986KAVDKHHPAP
HP F1905E
4
1. Product Feature
48.3 cm (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
HP F1905E
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.
Power Board
Monitor Block Diagram
CCFT Drive.
Main Board
Keyboard
Flat Panel and CCFL backlight
RS232 Connector For white balance adjustment in factory mode
AC-IN
100V-240V
HOST Computer
5
Video signal, DDC
HP F1905E
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.
-
6
3.2 Control Buttons
HP F1905E
7
3.3 Adjust the Picture
HP F1905E
1.
2.
3.
4.
5.
6.
Brightness
Contrast Adjust the contrast
Image Control
Color
Language Shows the language of the OSD window.
Management
Adjust the brightness.
Adjust the: Auto Adjustment: Adjusts the main settings and produces a stable, centered
image.
H-Position: horizontal position of the screen image. 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 SRGB: recall SRGB color Custom Color: adjusts the color tint of white, and the red, green, and blue (RGB)
mix for colors.
Power Saver: enable/disable power saving Power On Recall: enable/disable power recall Mode Display: enable/disable mode display Sleep Timer: set sleep timer Basic Menu: set to basic menu
7.
8.
9.
10.
OSD Control
Information Factory
Reset Exit Exit the current OSD window.
OSD (on Screen Display) settings: adjusts the H/V position, timeout, On Screen Display window.
Current setting, recommended setting, serial number, total hours, backlight hours, Exit.
Resets the display to original factory settings for color, brightness, phase, and clock.
8
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 1 1 NC None (Reserved for Factory Use)
HP F1905E
4 NC 5 GND 6 RG Red GND 14 VS Vertical Sync 7 GG Green GND 15 SCL DDC Clock 8 BG Blue GND
Ground (DDC Return)
None
PIN 1
PIN 11
12 SDA DDC Data 13 HS Horizontal Sync
VGA connector layout
PIN 5
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)
4 TX 4 - TMDS Data 4 - 16 HPD
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 1 1 SHLD 1 / 3 TMDS Data 1 / 3 Shield 23 TX CLK + TMDS Clock + 12 TX 3 - TMDS Data 3 - 24 TX CLK - TMDS Clock -
Hot Plug Detect (connect internally to
pin-14)
9
4.2 Factory Preset Display Modes
HP F1905E
DVI-D digital connector layout
Factory Pre-set Video Input Modes
Pre-set Pixel Format
Horizontal
Frequency (kHz)
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
Vertical Frequency
(Hz)
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
10
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
5.1 General Feature
HP F1905E
11
5.2 Optical Characteristics
HP F1905E
12
6. Block Diagram
6.1 Monitor Exploded View
HP F1905E
13
6.2 Software Flow Chart
HP F1905E
1
Y
2
N
3
4
5
Y
N
6
7
9
N
8
Y
10
N
11
Y
N
12
14
Y
13
Y
15
Y
N
N
16
17
18
N
19
Y
14
REMARK:
HP F1905E
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?
15
6.3 Electrical Block Diagram
6.3.1 Scalar Board Block Diagram
HP F1905E
16
6.3.2 Inverter / Power Board Block Diagram
HP F1905E
Inverter Block Diagram
17
Power Block Diagram
HP F1905E
18
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