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 RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
MANUFACTURE DATA: Jul-29-04
0
TABLE OF CONTENTS
1. SPECIFICATIONS FOR LCD MONITOR 3
1-1 GENERAL PECIFICATIONS 3
1-2 LCD MONITOR DESCRIPTION 4
1-3 PANEL SPECIFICATION (AU EN02)
13. Outside dimension: Width x Height x Thickness = 432x 440 x 198 mm
14. Plug and Play: VESA DDC1/DDC2B
15. Power saving: Compatible VESA DPMS
16. Audio performance (optional): Each speaker shall accept up to 3.0 watt of audio
power without damage or exceeding the frequency response and total harmonic
distortion specification and audio amplifier shall provide two channels of audio up to
2.0 watts per channel from 100Hz to 20kHz.
17. USB hub (optional): 1 up-stream and 4 down-streams
2
1-2 LCD MONITOR DESCRIPTION
p
Osc
The LCD monitor contains main-board, Inverter module, keyboard, audio module,
USB-hub module and External Adapter.
The main-board controls all logic signals such as panel control logic, backlight
control logic, …etc.
The Inverter module will drive the backlight of panel.
The Adapter supplies power to the LCD monitor.
Analog RGB
DDC-chip
-
DVI input
DC 12V 5Amp
illator 24
-
Gm5020 (U600)
MCU (U502)
Main-board Block diagram
Frame store
Data Digital RGB
Panel Control Signal:
Phs, Pvs, PclkA/B,
Pdis
e
Communication signal:
Hclk, Hfs, Hdata0
Crystal 24 MHz
Audio module
(optional)
LVDS chip
PANEL
Panel Power 5V
Panel-Power Control
(U203)
USB hub module
(optional)
INVERTER
module
3
1-3 PANEL SPECIFICATION (AU EN02)
1-3-1 Panel Feature
- 19 inch Color TFT-LCD
- ALL input signals are 2 Channel LVDS interface compatible
- Supported the SXGA(H1280Pixel × V1024Lines) resolution
- By applying 16.7M colors (RGB 8 bit data)
1-3-2 Display Characteristics
ITEM UNIT SPECIFICATIONS
Screen Diagonal [mm] 480(19”)
Active Area [mm] 376.32(H) x 301.056(V)
Pixel Pitch 1280(x3) x 1024
Pixel Arrangement [mm] 0.294(per one triad) x 0.294
Display Mode R.G.B Vertical Stripe
White Luminance (Center) [cd/m²] 250 cd/m²@7mA (Typ)
Contrast Ratio 600:1(Typ)
Optical Response Time [msec] 25(Typ)
Nominal input Voltage VDD [Volt] +5.0V
Power consumption
(VDD line + CCFL line)
[Watt]
28W (Typ.) (w/o Inverter, All white pattern)
Weight [Grams] 2700(Typ)
Physical Size [mm] 404.2(W) x330 (H) x20 (D)(Typ)
Electrical Interface Even/Odd R/G/B data, 3 sync signal Clock
Support Color 16.7M colors (RGB 8-bit data)
Temperature Range
Operating
Storage (Shopping)
[℃]
[℃]
0 to +50
-20 to +60
4
1-3-3 Optical Characteristics
The optical characteristics are measured under stable conditions at 25℃ (Room
Notice: For digital input, the resolution 1280x1024@ 85hz, 1280x960@ 85Hz are not
supported.
Sync
Polarit
y
Nomina
l
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
6
IBM MODES
Horizontal Vertical
Nominal
Pixel
Clock
(MHz)
Mode Resolution Total
Nominal
Frequency
+/- 0.5kHz
Sync
Polari
ty
Nominal
Freq.
+/- 1 Hz
Sync
Polarit
y
DOS 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
720x400@85Hz 936 x 446 37.927 N 85.039 P 35.550
DOS 640x400@70Hz 800 x 449 31.469 N 70.087 P 25.175
DOS 640x350@70Hz 800 x 449 31.469 P 70.087 N 25.175
All modes will automatically optimize the screen size with “ AUTO-config “ function, except
3 dos- modes: 640x480@60hz, 720x400@70hz, 640x350@70hz.
1-5 INTERFACE CONNECTION
(A) AC-Power Cable
(B) Video Signal Connectors and Cable
(C) DVI-D and DVI cable
(D) Audio cable (optional)
(E) USB cable (optional)
(F) External Adapter
7
2. PRECAUTIONS AND NOTICES
2-1 ASSEMBLY PRECAUTION
(1) Please do not press or scratch LCD panel surface with anything hard. And do not
soil LCD panel surface by touching with bare hands (Polarizer film, surface of
LCD panel is easy to be flawed)
In the LCD panel, the gap between two glass plates is kept perfectly even to
maintain display characteristic and reliability. If this panel is subject to hard
pressing, the following occurs:
(a) Uniform color
(b) Orientation of liquid crystal becomes disorder
(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of
it being soiled.
(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface
immediately.
They might damage to cause panel surface variation and color change.
(4) Do not apply any strong mechanical shock to the LCD panel.
2-2 OPERATING PRECAUTIONS
(1) Please be sure to unplug the power cord before remove the back-cover. (Be sure
the power is turn-off)
(2) Please consider that LCD backlight takes longer time to become stable of
radiation characteristic in low temperature than in room temperature.
(3) Please pay attention not to displaying the same pattern for very long-time. For
image might stick on LCD.
2-3 STORAGE PRECAUTIONS
(1) When you store LCD for a long time, it is recommended to keep the temperature
between 5℃-40℃ without the exposure of sunlight and to keep the humidity less
than 85% RH.
(2) Please do not leave the LCD in the environment of high humidity and high
temperature such as 60℃ 90%RH.
(3) Please do not leave the LCD in the environment of low temperature; below -15℃.
2-4 HIGH VOLTAGE WARNING
The high voltage is only generated by INVERTER module; carelessly contacting the
transformer on this module can cause a serious shock. (The lamp voltage after
stable around 600V, with lamp current around 6.5mA, and the lamp starting voltage
was around 1650V, at Ta=25℃)
8
3. OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the LCD monitor
display.
1. Position the display on the desired operation and plug–in the power cord into
External Adapter AC outlet. Three-wire power cord must be shielded and is
provided as a safety precaution as it connects the chassis and cabinet to the
electrical conduct ground. If the AC outlet in your location does not have
provisions for the grounded type plug, the installer should attach the proper
adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system
device and lock both screws on the connector to ensure firm grounding. The
connector information is as follow:
15 - Pin Color Display Signal Cable
PIN NO.
DESCRIPTION
1. RED 9. 5V power from VGA-card
2. GREEN 10. Detect Cable
3. BLUE 11. SYNC. GND
4. GND 12. DDC-Serial Data
5. GND 13. HORIZ. SYNC
6. GND-R 14. VERT. SYNC
7. GND-G 15. DDC Serial Data
8. GND-B
1
6
1115
PIN NO.
5
10
DESCRIPTION
9
3. Connect the 24-pin color display shielded DVI-DVI signal cable to your signal
system device and lock both screws on the connector to ensure firm grounding.
The connector information is as follow:
15 - Pin Color Display Signal Cable
PIN NO.
DESCRIPTION
PI N NO.
DESCRIPTION
1. TMDS Data 2- 13. TMDS Data 3+
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shield 15. Ground (for+5V)
4. TMDS Data 4- 16. Hot Plug Detect
5. TMDS Data 4+ 17. TMDS Data 0-
6. DDC Clock 18. TMDS Data 0+
7. DDC Data 19. TMDS Data 0/5 Shield
8. N.C. 20. TMDS Data 5-
9. TMDS Data 1- 21. TMDS Data 5+
10. TMDS Data 1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock +
12. TMDS Data 3- 24. TMDS Clock -
4. Apply power to the display by pressing the power key for about 2 second
consecutively and allow about several seconds for Panel warm-up. The PowerOn indicator lights up when the display is on.
5. With proper signals feed to the display, a pattern or data should appear on the
screen, adjust the brightness and contrast to the most pleasing display, or press
auto-key to get the factory preset best picture-quality.
6. This monitor has power saving function following the VESA DPMS. Be sure to
connect the signal cable to the PC.
7. If your LCD monitor requires service, it must be returned with the power cord &
Adapter.
10
4. ADJUSTMENT
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
Adjustments should be undertaken only on following function: Contras, Brightness,
Black level, Phase, Clock, H/V-position, Languages, Color- (C2, C1, User), Auto level, ,
Languages, Reset, RGB level, input selected, scaling mode
- Power Button:
When pressed, the monitor enters the off mode, and the LED turns blank. Press again
to restore normal status.
- Left / Right Button:
The Left/Right Button is used to control the monitor functions. Press to switch
functions or adjust settings.
- Auto Adjust Key:
The Auto Adjust Key is used to automatically set the H Position, V Position, Clock and
Phase.
- Power Indicator:
Green — Power On mode.
orange — Power Saving mode.
Blank —Power Off Mode.
4-2 ADJUSTMENT METHOD AND DESCRIPTION
4-2-1 White-Balance, Luminance adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white
balance adjustment.
Before start adjusting white balance, please set Chroma-7120 MEM. Channel 1 to C2
color and MEM. channel 2 to C1 color, (our C2 parameter is x = 296 ±20, y = 311 ±20,
Y = 220 and C1 parameter is x = 313 ±20, y = 329 ±20, Y = 220)
How to setting MEM. channel you can reference to chroma 7120 user guide or simple
use “ SC” key and “ NEXT” key to modify x,y,Y value and use “ID” key to modify the
TEXT description
Following is the procedure to do white-balance adjustment:
Press MENU button during 1 seconds along with plug in the DC-power cord will
activate the factory mode, and the OSD screen will located at left top of the panel.
2.) Connect Alignment Tool JP2 with Chroma 7120, JP3 with Monitor Analog
Connector, JP4 with Pattern Generator.
3.) Press Menu and Select Button, then Power on Monitor to enter Factor Mode.
4.) Press [SW1] at Alignment Tool.
5.) Change Pattern Generator Pattern to Full White Pattern.
6.) Press [SW2] at Alignment Tool.
7.) Wait LED from OK -> BUSY -> OK.
8.) Press [SW3] once to verify 7800 color temperature.
9.) Press [SW3] once to verify 6500 color temperature.
10.) If there is error at step 7 to 8, repeat step 4 to 9.
4-2-2 OSD adjustments
11
Turn the POWER-button off to on to quit from factory mode (in USER-mode, the
OSD window location was placed at the middle of the screen) Press MENU
button to activate OSD Menu or make a confirmation on desired function, Press
Left/Right button to select the function or done the adjustment.
1. Clock adjustment
Set the Chroma at pattern 63 (cross-talk pattern) or WIN98/95 shutdown mode
(dot-pattern).
Adjust until the vertical-Stripe-shadow as wide as possible or no visible.
This function is adjust the PLL divider of ADC to generate an accurate pixel clock
Example: Hsyn = 31.5KHz Pixel freq. = 25.175MHz (from VESA spec)
The Divider number is (N) = (Pixel freq. x 1000)/Hsyn
From this formula, we get the Divider number, if we fill this number in ADC
register (divider register), the PLL of ADC will generate a clock which have same
period with above Pixel freq. (25.175MHz) the accuracy of this clock will effect the
size of screen. (This clock was called PIXEL-CLOCK)
2. Focus adjustment
Set the Chroma at pattern 63 (cross talk pattern) or WIN98/95 shut down mode
(dot-pattern).
Adjust the horizontal interference as less as possible
This function is adjusting the phase shift of PIXEL-CLOCK to acquire the right
pixel data.
If the relationship of pixel data and pixel clock not so match, we will see the
horizontal interference on screen, we only find this phenomena in crosstalk
pattern or dot pattern, other pattern the affect is very light
3. H/V-Position adjustment
Set the Chroma to pattern 1 (crosshatch pattern) or WIN98/95 full-white pattern
confirm above item 2 & 3 functions (clock & focus) was done well, if that 2
functions failed, the H/V position will be failed too. Adjust the four edges until all
four-edges are visible at the edge of screen.
4. Language function
There have 5 languages for selection, presses “MENU” to select and confirm,
press “UP” or “ DOWN” to change the kind of language (English, Deutch,
Francais, Espanol, Italian)
5. Reset function
Clear each old status of auto-configuration and re-do auto-configuration (for all
mode)
This function also recalls C2 color-temperature.
The descriptions for function control LEDS is as following list
12
1.
2.
3.
Contrast Adjust the picture contrast.
Brightness Adjust the picture brightness.
Input
Selected
Input Signal source selected (select Analog or Digital input
source)
4.
5.
6.
7.
8.
9.
10.
11.
12.
13 C1
15. C2
16.
17.
Focus Adjust picture Focus.
Clock Adjust picture Clock.
H- Position Adjust the horizontal position of the picture.
V- Position Adjust the vertical position of the picture.
Language Multi-Language selection
Scaling
Mode
Red Adjusts Red intensity.
Green Adjusts Green intensity.
Blue Adjusts Blue intensity.
(6500K)
Color
(7800K)
Color
Reset
Exit Save user adjustment and OSD disappear.
Stretch the picture to fit full screen, screen size ratio or native
size.
The color temperature for 6500°K is x=0.313, y=0.329.
The color temperature for 7800°K is x=0.296, y=0.311.
Clear each old status of Auto-configuration and re-do auto-
configuration and set the color temperature to 7800°K.
13
555 55 BLOCK DIAGRAM
6655-1 SPECIAL FUNCTION WITH PRESS-KEY
Press menu button during 2 seconds along with plug-in the DC Power cord:
That operation will set the monitor into “Factory- mode”, in Factory mode we can
do the White balance adjustment with RS232 .In Factory mode, OSD-screen will
locate in left top of screen. Press POWER-button off to on once will quit from
factory mode and back touser-mode. The OSD-index explanation is as following:
1. No signal: No signal input (Signal-cable not connected).
2. Input not supported:
a. Input frequency out of range: H > 92kHz, v > 85Hz or H < 31kHz, v < 55Hz
b. Input frequency out of VESA-spec. (Out of tolerance too far)
5-2 CIRCUIT FUNCTION DESCRIPTION
5-2-1 main board
1. U600, scaler IC gm5020 (all-in-one chip solution for ADC, OSD, scalar and
interpolation):
USE for computer graphics images to convert analog RGB data to digital data with
interpolation process, zooming, generated the OSD font, perform overlay function
and generate drive timing for LCD-PANEL.
2. U502, W78E65 (WINBOND- MCU, type 8052 series with 64k Rom-size and 512
byte ram):
Use for calculate frequency, pixel-dot, detect change mode, rs232-communication,
power-consumption control, OSD-index warning, …etc.
3. U301,ATMEL12524C02N
EEPROM type, 1K ROM-SIZE, for saving Digital DDC-CONTENT.
4. U302, MIRCOCHIP24LC21A
EEPROM type, 1K ROM-SIZE, for saving Analog DDC-CONTENT.
4. U501, 24C16 (ATMEL IC):
EEPROM type, 16K ROM-SIZE, for saving AUTO-config data, White-balance data,
and Power-key status and Backlight-counter data.
5. U901,SI8050(switching regulator 12V to 5V with 3A load current) .
6. U904,AIC 1084-33CM (AIC brand linear regulator 5V to 3.3V)
7. U902,RT9164(Linear regulator 5V to 2.5V)
8. U201,U202,LVDS ( use NOVATEK NT7181F)
Convert the TTL signal to LVDS signal , the advantage of LVDS signal is : the
wire can be lengthen and eliminate wire number , low EMI .LVDS signal is high
frequency but low voltage, only 0.35 VPP ,the frequency is seven times higher than
TTL
14
5-2-2 adapter/inverter
1. ADAPTER: CONVERSION-module to convert AC 110V-240V to 12VDC, with 5
AMP
2. INVERTER: CONVERSION-module to convert DC 12V to High-Voltage around
1650V, with frequency 30K-80Khz, 5mA-13mA
5-3 SOFTWARE FLOW CHART
POWER-ON START
Initial MCU I/O, Interrupt vector & Ram
Check Eeprom is empty?
Check White-balance data (C1 & C2) same with the backup data?
Check POC (backlight counter) data same with the backup data?
IF not same, overwrite the data with backup value.
Check Previous power-switch status from Eeprom, & other system status
Initial gm5020
Check if in Factory mode? (When power-on, press the
MENU Button will be in FACTORY mode)
Clear factory mode flag
MAIN-SUBROTINE LOOP
Initial 1.POC (backlight counter)
2. Clr all mode value
SET factory mode flag
15
Main subroutine loop
Main loop start
Process Power-saving status (according to below flow-chart result)
Check gm5020 IFM status .is change or not.
And check Signal cable status (cable not connected or not)
** IFM is the register, which measured the HSYN & Vsyn status
Check the IFM result is in the user mode
table?
Check Auto-config mode flag already been set?
Read Key status and Process on OSD-screen
Monitoring the time-out of osd status (if no key input persist for
10 sec, the osd time-out counter will trigger)
)
Yes, IFM have change
Is current system status in Power-saving?
Check the IFM result is in the standard
Mode table?
Out of range (input not support) be
confirm
Confirm the frequency (Hsyn or Vsyn) from IFM already
been changed? (Check the change mode flag)
Process (turn off OSD, setting GM5020according to
above parameter, set LED status, set backlight status)
Check Factory mode flag= 1
Wake-up gm5020
(Because gm5020 was in
partial sleeping state)
Set mode index & parameter
Set change mode flag
Do Auto-config
automatically
If the RS232 buffer is full,
process the command (while
adjust white-balance in factory
mode)
Replace INVERTER to new-one, and
Check the screen is normal??
OSCILLATOR BLOCK
Measured X501 Oscillator output 24MhZ?
Measured X600 Crystal output 24 KHz?
OK, R202 have
-do white
OK
NG, no Voltage
U600-DATA OUTPUT
Measured DCLK, DHS, DVS, DEN (pin G20,
F20, F19, F18 from U600)
Is there have any transition?
Pclk around 47MHz to 57MHZ, PVS=60.09Hz,
PHS around 67 KHz?? (Refer to input
signal=640x480@60 Hz 31k, and LED is green)
OK
Check the PPWR panel power relative circuit,
R201, R202, Q201, U203 (pin 5,6,7,8)
In normal operation, when LED =green, R223
Should =0 v,
If PPWR no-response when the power switch
Turn on and turn off, replace the U600-GM5020
Check U203 pin 1,3= 5V
Replace U203 (Nmos, SI9953)
NG
502 pin18
Check the Bklt-On relative circuit, R520, Q503, R519,
In normal operation, when LED =green,
R520 Bklt-On should =0 v,
If Bklt-On no-response when the power switch turn on-off,
Re
lace the MCU
Replace Oscillator X501
Replace Crystal X300
Replace GM5020 (U600) or replace
main board
If Main Board being replace, please
do the DDC – content
19
p
II (a) the screen is abnormal, stuck at white screen, OSD window can’t appear,
but keyboard & LED is normal operation.
At general, this symptom is cause by missing panel data or panel power, so we must
check our wire-harness, which connected to panel or the panel power controller (U203)
Check if the Wire harness from CN201 loose?
Check the wire on both Panel-side and Main board side.
Tighten it.
Yes, tight enough
Check the Panel-Power circuit as above (page 20)
U203 pin 5,6,7,8, must be 5V
Replace U502 MCU and check it RESET
pin 10, must be turn high to low when first
AC
ower-on
OK, reset is normal
Check U600 DATA-OUTPUT block again
NG, still no data out
Replace U600 GM5020
20
II. (B) The screen had the Vertical Straight Line, may be stuck in Red, Green or Blue
That symptom is cause by bad Panel issue (might be the Source IC from Panel is cold
soldered or open looped) so replace the panel and try it.
III.ALL SCREEN HAS INTERFERENCES OR NOISE, CAN’T BE FIXED BY AUTO KEY
** NOTE: There are so many kinds of interferences,
1). One is caused by some VGA-CARD that not meet VESA spec or power grounding too
bad that influence the circuit.
2). Other is cause by external interferences, move the monitor far from electronic
equipment. (Rarely happened)
Use DOT-pattern, or win98/99 shutdown
mode pattern, press “AUTO” key, was the
interferences disappear??
Adjust “FOCUS” step by step, until the
horizontal interferences disappear
Does your signal-cable have an additional
cable for extension??
Does your noise only exist in one mode only?
(Ex: only at 1280x1024 @ 85 Hz, other is normal)
That was caused by you VGA-CARD setting, your VGA
card timing back porch / front porch exceed vesa timing
too far, for some new AGP-VGA-CARD such situation
always happened
So in your control-panel icon, select monitor, setting,
advance, screen-adjust, at
Size icon, increase step by step slowly, and press,
“AUTO” key every step you increase the SIZE repeat
the procedure (increase/decrease SIZE one-step and press
AUTO) until the interferences disappear, press
“APPLY” to save in your VGA
Noadditional extension cable
Yes, only happened on one mode
Yes, has extension
END
END
Put away the additional cable
May be the additional cable grounding is
not quite good.
Change the Signal-cable to new one or
Try other brand VGA-CARD
(Make sure just only that brand VGACARD has this problem)
21
III There is interferences in DOS mode
NOTE: the criteria of doing AUTO-CONFIGURATION: must be a full-size screen, if the
screen not full, the auto-configuration will fail. So in DOS mode, just set your “CLOCK” in
OSD-MENU to zero or use some EDITOR software which can full fill the whole screen (ex:
PE2, HE) and then press “AUTO” Or you can use “DOS1.EXE” which attached in your
Driver disk to optimize DOS mode performance.
IV The panel luminance is down
Use white pattern and resolution 1280x1024 @ 60Hz, CHROMA 7120 measured the
center of panel
Set Contrast, brightness =maximal, RGB= 50
Quit from OSD-screen, measured Y (luminance)
With chroma 7120, check Y= 230±10 cd/m2?
If Y can reach >240 cd/m2 that means
The lamp still working well, so we just re-do the
white-balance process
As following procedure
If the Y less than 200 cd/m2 (after the contrast,
brightness = max) then change the LAMP of panel
Use white-pattern, press MENU button along
with AC power-plug in (you will in factory
mode) The OSD-menu will be at left top of
screen,
Press AUTO button to automatically adjust black
level value, you will see the sign PASS
Follow White-Balance, Luminance adjustment
as above, method to more detail procedure
For do a white-balance adjust
6-2-2 INVERTER –MODULE TROUBLE SHOOTING CHART
**Note: the Waveform of U901 pin 2 can determined the power situation
1. Stable rectangle waveform with equal duty, freq around 150K-158KHz
that means all power of this interface board is in normal operation
, And all status of 5V & 3.3V is working well
2. Unstable or uneven rectangle waveform without same duty, that means
ABNORMAL operation was happened, check 3.3V or 5V, if short-circuit or bad
component
3. Rectangle waveform with large spike & harmonic pulse on front side means all
3.3v is no load, U600 Gm5020 was shut-down, and only U502 MCU still working,
that means the monitor is in power saving status, all power system is working
well.
22
Check IC1 pin9=12V
pin9=12vvoltage of
C905(+)
Check C1 (+) =12V
NG
OK
Check ON/OFF signal
NG
OK
NG
Check the pin1 of IC1 have saw tooth wave
OK
Check F1/ D1/Q3/Q4or
D2/Q9/Q10
Check Interface board
CheckQ1 or Q2
OK
NG
Change IC1
Check MOSFET Q5/Q8 if has the output of square wave.
OK
NG
Check Q6/Q7//D3 or
Q11/Q12 /D4
Check the resonant wave of pin2 & pin5 for T1/T2
OK
NG
Check Q6/Q7/C5 or
Q11/Q12/C19
Check the output of T1/T2
OK
NG
Change T1or T2
Check connecter & lamp
END
23
6-2-3 KeyPad Board module trouble-shooting chart
I
OSD is unstable or not working
Is KeyPad Board connecting normally?
Y
Is Button Switch normally?
Y
Is KeyPad Board Normally?
Y
N
N
N
Connect KeyPad Board
Replace Button Switch
Replace KeyPad Board
Check Main Board
24
,
r
II
Check U502 MCU pin 43,42,41,40,39 at
High state (5V)? without press any key
Press power key and check U502 pin 43
= low (0V)?
Check U502 pin 37 (LED green) will have
transition from hi to low or low to hi when we
press the power key??
Check U502 pin 20= 24MHz? And pin 44
(VDD)=5V? And pin 10 (reset)=0V ? At norm al
condition
Without press key and change mode, Check U502
pin 16,17(SDA, SCL)= hi 5V? Or keep
transition?
Replace U502 MCU
NG, MCU no response
NG
Mechanical stuck, Check!
Check main board PR505 shortage?
Replace Tact-switch SW105 at keyboard if still
no work replace U302 MCU at main-board and
check MCU relative reset circuit, and crystal
If still no Led green indicator, check LED at
keyboard !! cold solder or bad
If one of these items was NG, check the relative
circuit
FSCLK SHEET 7.Frame Store
FSCKE SHEET 7.Frame Store
FSRAS SHEET 7.Frame Store
FSCAS SHEET 7.Frame Store
FSWESHEET 7.Frame Store
FSDQM0 SHEET 7.Frame Store
FSDQM1 SHEET 7.Frame Store
FSDQM2 SHEET 7.Frame Store
FSDQM3 SHEET 7.Frame Store
CN501 33L3802 9H WAFER 9P RIGHT ANELE PI 1 PCS
CN201 33L801724A H PIN HEADER 24P 2.0mm 1 PCS
CN502 33L8022 12 H PIN HEADER FEMALE 2*6 9 1 PCS
40L 457624 1B CPU LABEL 1 PCS
40L 45762412B CBPC LABEL 1 PCS
44L3231508512 导电泡棉 1 PCS
44L3231508513 导电泡棉 1 PCS
49L 51 1A 去渍油 0.05 ML
51L 6 4500 RTV 胶 0 G
51L 6 4502 RTV 胶 0 G
51L 6 4503 RTV 胶 3 G
52L6026 1 网版纸 20 MM
52L6026 2 网版纸 20 MM
55L 100600 A 防溅焊锡 0.3 G
55L 100600 B 锡丝 0.3 G
55L 100605 锡丝 9.1 G
33L4499 1 LENS 1 PCS
34L1019DD5 2L FRONT PANEL 1 PCS
34L1023 U2 L STAND B 1 PCS
34L1024 U2 L BASE 1 PCS
34L1025 U2 L STAND-F 1 PCS
37L 461 1 "19""LCD HINGE" 1 PCS
Q1L 340 12128 SCREW 4 PCS
Q1L 930 16120 SCREW (3X16) 4 PCS
W33L4497 D5 L SIDE COVER (KEY) 1 PCS
W33L4498 D5 L SIDE COVER 1 PCS
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