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L1702
Service Manual
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Service Manual
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AOC L1702 Service Manual

HP L1702
SERVICE MANUAL
17” LCD Monitor
L1702
1
Table of Content
HP L1702
Revision List ----------------------------------------------------------------------------------------------------------------------------
1.Monitor Specification --------------------------------------------------------------------------------------------------------------
2.LCD Monitor Description --------------------------------- ---------------------------------------------------- -- -- ----------------
3.Operation Instructions ------------------------------------------------------------------------------------------------------------
3.1 General Instructions ---------------------------------------------------- -------------------------------------------------------- 06
3.2 Control Button ------------------------------------------------------------------------------------------------------------------- 06
3.3 Adjusting The Picture ---------------------------------------------------------------------------------------------------------- 07
4. Input/Output Specification ------------------------------------------------------------------------------------------------------
4.1 Input Signal Connector -------------------------------------------------------------------------------------------------------- 08
4.2 Factory Preset Display Modes ---------------------- ------------------------------------------------------------------------ 09
4.3 Power Supply Requirements ------------------------------------------------------------------------------------------------- 09
5.Panel Specification ------------------------------------------------------------------------ ------------------------------ -------------
5.1 General Feature ----------------------------------------------------------------------------------------------------------------- 10
5.2 Optical Characteristics --------------------------------------------------------------------------------------------------------- 11
6. Block Diagram -------------------------------------------------------- --------------------------------------------------------------
6.1 Monitor Exploded View --------------------------------------------------------------------- -- -------------------------------- 12
03 04 05 06
08
10
12
6.2 Software Flow Chart ---------------- ------------------------------ ------------------------------ -------------------------------- 13
6.3 Electrical Block Diagram ------------------------------------------------------------------------------------------------------- 15
6.3.1 Scalar Board ---------------------------------------------------------------------------------------------------------------- 15
6.3.2 Inverter/Power Board ----------------------------------------- -- -- -- -- -- -------------------------------------------------- 16
7. Schematic ----------------------------------------------------------------------------------------------------------------------------
7.1 Main Board ---------------------------------------------------------------------------------------------------------------------- 17
7.2 Power Board -------------------------------------------------------------------------------------------------------------------- 23
8. PCB Layout -------------------------------------------------------------------------------- ------------------------------------------
8.1 Main Board ---------------------------- ---------------------------------------------------------- --------------------------------- 26
8.2 Inverter/Power Board -------------------------------------------------- ------------------------------ --------------------------- 27
8.3 Key Board ----------------------------- -------------------------------------------------------------------------------------------- 27
9. Maintainability -----------------------------------------------------------------------------------------------------------------------
9.1 Equipments and Tools Requirements -------------------------------------------------------------------------------------- 28
9.2 Trouble Shooting ---------------------------------------------------------------------------------------------------------------- 29
9.2.1 Main Board --------------------------------------------------------------------------------------------------------------- 29
9.2.2 Power/Inverter Board --------------------------------------------------------------------------------------------------- 30
17
26
28
9.2.3 Key Pad Board ------------------------------------------------------------------------------------------------------------- 32
10. White-Balance, Luminance Adjustment ---------------------------------------------------------------------------------
11. EDID Content ----------------------------------------------------------------------------------------------------------------------
12. BOM List ------------------------------------------------------------------------------------- ---------------------------- ------------
2
33 35 36
HP L1702
Revision List
Version Date Revision History TPV Model Name
A00 Feb-03-06 Initial release T782KAXHTZHPN
3
1.Monitor Specification
Items Description
Driving system TFT Color LCD Panel M170EN05 V.1 Size (Active Area) 337.920(H) x270.336 (V) (43.2cm 17.0")
HP L1702
LCD Panel
Input
Display Colors Over 16 million Colors Dot Clock 140MHz Max. Resolution 1280 x 1024 Plug & Play VESA DDC2BTM
Pixel pitch 0.264mm( H )x 0.264mm( V ) Response time (typ.) 16 ms White Luminance 260 Contrast Ratio 450:1 Video Analog Sync. Type H/V TTL H-Frequency 30kHz – 81kHz V-Frequency 56-76Hz
ON Mode
40W
≤
Power Consumption
Power Source 90~265VAC,47~63Hz
Environmental Considerations
Main Dimensions
Humidity Operating 20% to 80% Altitude Operating 0 to 12,000 feet
Sleep Mode OFF Mode
Operating Temp: 5°C to 35°C Storage Temp.: -20°C to 60°C Operating Humidity : 20% to 80%
Mounted Overall(W*H*D) 379.0mm*450.0mm*198.0mm Screen Opening(W*H*D) 340mm*272mm*430mm(Diagonal)
≤
≤
2W 2W
4
HP L1702
2.LCD Monitor Description
The LCD Monitor will contain a main board, a power board, and a 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.
(Include adapter and inverter)
Power Board
AC-IN
90V-264V
Monitor Block Diagram
CCFT Drive.
Main Board
Keyboard
Flat Panel and CCFL backlight
RS232 Connector For white balance adjustment in factory mode
Video signal, DDC
HOST Computer
5
HP L1702
3. Operation Instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front of the 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 po wer indicator will light up to Green.
3.2 Control Buttons
- Power Button:
When pressed, the monitor enters the off mode, and the LED turns blank. Press again to restore normal status.
- (Down/ Auto) and + ( Up) Button:
The -/+ Button is browse OSD key. Press a select into adjustment. The Auto Adjust Key is used to automatically set the H Position, V Position, Clock and Phase.
- Select Key:
Select key is into OSD sub-menu hot key when OSD turn on.
- Power Indicator:
Green — Power On mode. Amber — Power Saving mode. Blank — Power Off Mode.
6
3.3 Adjust the Picture
HP L1702
1.
2.
3.
4.
5
Brightness Adjust the brightness.
Contrast Adjust the contrast
Adjust the: Auto Adjustment: Adjusts the main settings and produces a stable, centered image.
Image Control
Color
Language Shows the language of the OSD window.
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-sRGB: recall 6500K sRGB color Custom Color: adjusts the color tint of white, and the red, green, and blue (RGB) mix for colors.
6.
7.
8.
9.
Management
OSD Control
Factory Reset
Exit Closes the OSD window.
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 OSD (on Screen Display) settings: adjusts the H/V position, timeout, On Screen Display window. Resets the display to original factory settings for color, brightness, phase, and clock.
7
HP L1702
4. Input/Output Specification
4.1 Input Signal Connector
Pin Mnemonic Signal Pin Mnemonic Signal
1 RV Red Video 9 +5 V +5 V 2 GV Green Video/Sync on Green 10 SG Sync Ground 3 BV Blue Video 11 NC None 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
PIN 1
PIN 11
VGA connector layout
PIN 5
8
4.2 Factory Preset Display Modes
HP L1702
Pixel
Preset
1 640 x 480 31.469 - 59.940 - 25.175 VGA 2 640 x 480 37.861 - 72.809 - 31.500 VESA 3 640 x 480 37.500 - 75.000 - 31.500 VESA 4 720 x 400 31.469 - 70.087 + 28.322 VGA 5 800 x 600 37.879 + 60.317 + 40.000 VESA 6 800 x 600 48.077 + 72.188 + 50.000 VESA 7 800 x 600 46.875 + 75.000 + 49.500 VESA 8 832 x 624 49.726 +/- 74.551 +/- 57.284 MAC
9 1024 x 768 48.363 - 60.004 - 65.000 VESA 10 1024 x 768 56.476 - 70.069 - 75.000 VESA 11 1024 x 768 60.023 + 75.029 + 78.750 VESA 12 1152 x 870 68.68 - 75.06 - 100.000 Mac 13 1152 x 900 71.71 - 76.05 - 105.561 Sun 14 1280 x 1024 63.98 + 60.02 + 108.000 VESA
Format
Horz Freq
(KHz)
Horz
Polarity
Vert Freq
(Hz)
Vert
Polarity
Pixel Clk
(MHz) Source
15 1280 x 1024 79.97 + 75.02 + 135.000 VESA
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
≤37W
9
HP L1702
5. Panel Specification
5.1 General Feature
10
5.2 Optical Characteristics
HP L1702
11
6. Block Diagram
6.1 Monitor Exploded View
HP L1702
12
6.2 Software Flow Chart
HP L1702
1
Y
2
3
N
4
5
Y
N
6
N
7
8
Y
9
Y
N
11
10
N
12
13
N
Y
Y
14
15
N
16
Y
17
18
N
19
Y
13
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.
HP L1702
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?
14
6.3 Electrical Block Diagram
6.3.1 Scalar Board Block Diagram
HP L1702
EEPROM
AT24C16AN
(U602)
Crystal 20MHz
X601
MCU
(U601)
Key Board
(CN602)
Crystal
14.318MHz (X401)
LCD Interface
Scalar MST9111B
(Include : ADC,OSD)
(U401)
H sync V sync RGB
D-Sub
Connector
(CN301)
DDC_CLK DDC_DAT
EEPROM
AT24C02N
(U301)
15
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