Dell E190Sf, Руководство по обслуживанию

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Service Manual
25
Chapter 6- TROUBLE SHOOTING
1. Common Acknowledge
z If you change the M/B, be sure that the U301 and U402 these two components also changed to the
Item Content Equipment
Test OSD
function 1.Signal is set as 1280×1024@60Hz under General-1
2. LCM button are from left to right, checking whether each single function key and
compound function key can be worked.
Chroma
Signal
Generator
Contrast
Check
1. Set input mode to 1280×1024@60Hz
2. Set to 32gray scale pattern
3. Set contrast to the maximum. At most 6 bars cannot be distinguished.
Chroma
Signal
Generator
Color
Temperature
1. Do “Auto color Balance” at 1280×1024@60Hz, 32gray scale pattern
2. Measure color temperature, check if it complies with the following temperature :
5700K x=0.328 +/- 0.03, y=0.344+/-0.03
6500K x= 0.313 +/- 0.03, y=0.329+/-0.03
9300K x= 0.283 +/- 0.03, y=0.298+/-0.03
Chroma
Signal
Generator
and color
analyzer
Modes
switching
check 1. Use Chroma Pattern Generator to make sequence.
VESA (640x480 800x600 1024x768 1152x864 1280x1024), the detail supported
modes (see table 1) and power saving signal.
2. Confirm the above timing modes must be full screen and the picture must be
normal.
3. LED is amber at power saving mode.
Chroma
Signal
Generator
VGA cable
detector
When VGA cable is not plugged out, self-test OSD will be floated. Visual check
Minimum
luminance
measurement
1. LCD minimum luminance spec is 200cd/m2 (0-15 months from mfg. date)
2. 0-15 months: > 80% of minimum luminance
Chroma
Signal
Generator
and Color
Analyzer
OSD Lock
Test
Soft Lock: When OSD is locked, this icon should appear for only 2 seconds with all
buttons pressed, except for the “
Menu
” and “
Power
” ones.
Hard Lock: Press “
Menu
” button for 15 seconds enables the “locked” icon to be
displayed, which will lock All buttons expect for the “
Power
”. Press “
Menu
” button
for another 15 seconds enables the “unlock” icon to be shown.
Visual
Inspection
Panel Flicker
check
1. Mode:1280×1024@60Hz
2. Set Brightness& Contrast to default value (75%)
3. Do “Auto Adjustment”
4. Shut down PC to check whether there’s flicker on the center of the picture.
Equipment::
Chroma
Signal
Generator &
PC
Power
saving
1. Mode:1280×1024@60Hz
2. Pattern: full white
3. Brightness: Max.
4. Contrast: Default
5. Check power consumption at each modes
State Power Consumption LED color
Normal
＜
2 5
Ｗ
green
Stand By
＜
1
Ｗ
amber
Power Key Off
＜
0
.5
Ｗ
no
Chroma
signal
generator
and Power
meter
AC
input:230V/
50Hz