BenQ G2200we Service Manual

							22″ LCD Color Monitor                                                                         BenQ G2200WE 
41                                                                   
Key Board 
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SW 006
SW
1
2
C 004
N C / 0. 001uF
SGN DSGN DSGN DSGN D
SW 002SW
1
2
LED_GRN#
C 011
0. 1uFSW 003
SW
1
2
C 005
N C / 0. 001uF
LBAD C 2
SGN D
GN D
Z D 004
NC
LED_RED#
SGN D
R 006 1. 8K 1/10W
SW 005
SW
1
2
SGN D
SW 001SW
1
2
SGN D
SW 004SW
1
2
SGN D
LED 001
LED13
2
Z D 003
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R 005 3K 1/10W
Z D 005
NCZ D 001
NC
MENUPOW ER
RIGHT
C 007
0. 1uFC 010
0. 1uFZ D 006
NC
Z D 002
NC
R 002 3K 1/10W
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C 006
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LBAD C 1
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D C _POW ER ON
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SGN D
C 009
0. 1uF
LED_RED#
R 003 1. 8K 1/10W
R 004 1. 8K 1/10W
SGN D
C 002
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AUTO
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C 008
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							22″ LCD Color Monitor                                         BenQ G2200WE 
42                                                                  
Troubleshooting 
Frequently asked questions (FAQ)  
 The image is blurred:  
 Read the instructions on the link  Adjusting the Screen Resolution on the CD, and then select the correct 
resolution, refresh rate and make adjustments based on these instructions.  
 
  How do you use a VGA extension cable?  
 Remove the extension cable for the test. Is the image now in focus ? If not, optimize the image by working 
through the instructions in the  Adjusting the refresh rate section on the link  Adjusting the Screen 
Resolution . It is normal for blurring to occur due to conduction losses  in extension cables. You can minimize 
th ese losses by using an extension cable with better  conduction quality or with a built -in booster.  
 
  Does the blurring only occur at resolutions lower than the native (maximum) resolution?  
 Read the instructions on the link  Adjusting the Screen Resolution on the CD. Select the native resolution.  
 
  Pixel errors can be seen:  
 One of several pixels is permanently black, one or more pixels are permanently white, one or  more pixels are 
permanently red, green, blue or another color.  
•   Clean the LCD screen.  
•   Cyc le power on- off. 
•   These pixels are permanently on or off and that  is a natural defect occurs in LCD technology. 
 
  The image has a faulty coloration: 
 It has a yellow, blue or pink appearance.  
Select MENU > PICTURE > Color > Reset Color, and then choose “Y ES” in the “Caution” message box to 
reset the color settings to the factory defaults.  
If the image is still not correct and the OSD also has faulty coloration, this means one of the three  primary 
colors is missing in the signal input. Now check the signal cable connectors. If any pin is  bent or broken off, 
please contact your dealer to get necessary support.  
 
  No image can be seen:  
 Is the prompt on the display illuminated in green?  
If the LED is illuminated in green and there is a message “Out of Range”  on the screen, this means you are 
using a display mode that this monitor does not support, please change the setting to one of the supported 
mode. Please read the “ Preset display modes” section from the link  Adjusting the Screen Resolution. 
 
  Faint shad ow from the static image displayed is visible on the screen:  
•   Activate the power management function to let your computer and monitor go into a low power sleep 
mode when not actively in use.  
•   Use a screensaver to prevent the occurrence of image retention.  
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
43                                                                  
 Is the prompt on the display illuminated in orange?  
 If the LED is illuminated in orange, the power management mode is active. Press any button on the computer 
keyboard or move the mouse. If that does not help, check the signal cable connectors. If any  pin is bent or 
broken off, please contact your dealer to get necessary support.  
 
  Is the prompt on the display not illuminated at all?  
 Check the power supply mains socket, the external power supply and the mains switch.  
 
  The image is distorted, flash es or flickers: 
 Read the instructions on the link  Adjusting the Screen Resolution  on the CD, and then select the correct 
resolution, refresh rate and make adjustments based on these instructions.  
 
  You are running the monitor at its native resolution,  but the image is still distorted.  
 Images from different input sources may appear distorted or stretched on the monitor running at  its native 
resolution. To have the optimal display performance of each type of input sources, you  can use the Display 
Mode  function to set a proper aspect ratio for the input sources.  
 
  The image is displaced in one direction: 
 Read the instructions on the link  Adjusting the Screen Resolution  on the CD, and then select the correct 
resolution, refresh rate and make adjust ments based on these instructions. 
 
  The OSD controls are inaccessible:  
•   To unlock the OSD controls when the OSD is preset to be locked, press and hold the “MENU”  key for 15 
seconds to enter the “OSD Lock” option and make changes.  
•   Alternatively, you may use 
or  keys to select “NO” in the “OSD Lock” submenu from  the “OSD 
Settings” menu (under SYSTEM), and all OSD controls will be accessible.  
 
If your problems remain after checking this manual, please contact your place of purchase or  e-mail us at: 
Support @BenQ.com  
 
 
   
 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
44                                                                  
Ma in Board  
(1) No Power  
No power  
Press power key and look if 
the picture is normal  
Please reinsert and make 
sure the DC of  12V  is normal  
Reinsert or check 
the power section  
Check if X401 oscillate waveforms are normal  
Measure U201  Pin2=3.3V  
OK 
OK 
NG 
NG 
NG Replace  U201  
Check  U 401  
Replace X401   
OK 
NG 
Check CN 201 PIN3, 4  = 5V  
Check converter board  
NG
 
OK 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
45                                                                  
(2) No picture   
No picture  
OK NG 
X401 oscillate waveforms are normal  
Replace X401  
Check if the sync signal from computer is 
output and video cable is connected normally  
Input the sync signal of computer, or 
change the cable 
NG 
OK NG 
Check U401  
Replace U401   
Measure U201  Pin2=3.3V  
OK NG  Replace U 201 
 
Check CN 201 PIN3, 4  = 5V  
Check convert board  
NG
 OK 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
46                                                                  
(3) White screen  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
White  Screen 
Measure Q 602 base 
is low level?  X401 oscillate 
waveform is normal  
Check Correspondent 
component. 
Replace Panel 
Check Correspondent component.  
 
OK 
OK Replace X401  
 
NG 
NG 
NG  NG
 
Check reset circuit of 
U401 i   l 
OK 
Check  Q 602  is broken or 
CN6 01  solder?  Check U401  
OK Replace U401  
 
NG 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
47                                                                  
Power  Board   
No Power  
   
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Check  ZD902=12V  
Check AC line volt 110V or 220V  
Check AC  input  
Check the voltage of C905  (+)  
Check bridge rectified circuit and F901 circuit  
Check start voltage for the pin 5 of IC901  
Check R905, R 906,  R9 07 
Change IC901  
NG
 
Check the auxiliary voltage is bigger 
than  10V and smaller than 20V  
 
1) Check IC901 
2) Check R909/D901 /C903 circuit  
OK 
OK
 
NG   
Check  T901, IC90 3, D906 , D907, 
D905, D900, ZD901 
OK 
Check IC901 pin3  P W M wave  
OK 
Check IC901  
NG 
NG 
NG 
OK  
NG 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
48                                                                  
 W / LED, No Backlight 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Check Inverter  input =1 2 V  
NG  
OK Check adapter and  T801     
Check ON/OFF signal  
Check Interface board or main board   
NG
 OK 
Check  IC801  PIN4 = 5V  
NG 
OK Change ON/OFF  circuit  
Check  IC801 PIN 1 PWM wave  
NG OK Check IC801  
 
Check Q80 5, Q806  Drain wave  
NG 
Check the output of T 801 
Change Q805,  Q80 8 
Check connecter & lamp, feedback and protect circuit  
OK NG 
Change T801  
OK 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
49                                                                  
Ke y Board  
 
                   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
OSD is unstable or not working 
Is Key  Pad Board connecting normally? Connect Key  Pad Board 
Is Button Switch normally? Replace Button Switch 
Y 
N 
N 
Is Key  Pad Board  normally? Replace Key  Pad Board 
Y 
N 
Y 
Check Main Board 
 
 
						

							22″ LCD Color Monitor                                         BenQ G2200WE 
50                                                                  
PCB LAYOUT  
Main Board