Acer V551 User manual

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
1
Confidence and Property
Table of Contents
0. Preparation for Alignment............................................................................................................. 2
1. B+ Adjustment (For function test station only) ............................................................................ 2
2. Geometry Adjustment................................................................................................................... 2
3. Background Adjustment................................................................................................................ 3
4. Foreground Adjustment ................................................................................................................ 3
5. Final Check................................................................................................................................... 3
6. Focus Adjustment ......................................................................................................................... 4
7. Convergence Adjustment.............................................................................................................. 4
8. Power Saving Function Check...................................................................................................... 4
9. Geometry Specification for Production Line................................................................................ 5
10. Eyelet parts.................................................................................................................................. 5
11. Touch-up parts ............................................................................................................................ 7
12. Glue parts.................................................................................................................................... 8
13. Wire Dressing parts..................................................................................................................... 9

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
2
Confidence and Property
0. Preparation for Alignment
a. Pre-set all VRs to the center position except R/G/B bias VR101, 102, 103 counterclockwise to
maximum.
b. Set up unit and keep it warm up at least 15 minutes.
c. Preset mode
IBM VGA 640X480 31.5KHz/60Hz
IBM VGA 640X400 31.5KHz/70Hz
6448A 640X480 37.5KHz/75Hz
SVGA4 800X600 46.88KHz/75Hz
SVGA3 800X600 48.09KHz/72Hz
SVGA5 800X600 53.6KHz/85Hz
1. B+ Adjustment : (For function test station only)
a. Input mode 53.6KHz (SVGA5) with cross hatch pattern.
b. Press "SELECT +" and "ADJUST -" keys at a same time.
c. Adjust switching power supply VR601 to make the horizontal B+ to be 50.0 +/- 0.2VDC.
2. Geometry Adjustment
a. Enter factory area -- Press "SELECT +" and "ADJUST-" at the same time then turn power
switch on.
b. Press "ADJUST +" and "ADJUST -" at the same time to clear user area.
c. Input mode 31.5KHz (VGA 640x480) with tilt adjustment pattern.
d. Adjust CRT screw to meet tilt and orthogonal spec. ( Tilt < ±1 mm , Orthogonal < ±1.5mm )
e. Input the presetting modes and supporting modes with full white pattern.
f. Set external contrast to maximum and brightness to raster just cut-off position.
g. Press "SELECT +" or "SELECT -" to select the adjustment for H-size, H-phase, V-size,
V-center, Pincushion or Trapezoid.
h. Press "ADJUST +" or "ADJUST -" to make the geometry can meet item 9 table 2 spec.
i. Press "SELECT +" and "ADJUST -" at the same time to save the adjustment data.
j. Change timing to next mode and repeat step f, g and h.
k. After all modes are adjusted OK, turn power switch off.

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
3
Confidence and Property
3. Background Adjustment
a. Enter factory area -- Press "SELECT +" and "ADJUST -" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with raster only pattern.
c. Adjust external brightness key to maximum.
d. Check the bias VRs of VR101, 102, 103 at counterclockwise maximum position.
e. Adjust screen VR of FBT to obtain twilight raster about 0.7 to 1.2 Ft-L.
f. See which gun appears first, then adjust the two bias VRs of the other two non-appearing guns to
achieve the color temperature meet specification x=0.281 +/- 0.005
y=0.311 +/- 0.005
g. Adjust screen VR of FBT again to let the raster about 0.7 to 1.2 Ft-L.
4. Foreground Adjustment
a. Input mode 53.6KHz (SVGA5) with 3-inch block pattern.
b. Check the drive VRs of VR104, 105 at center position.
c. Adjust external brightness key to cut-off and external contrast key to let the light output be 15
Ft-L,
d. Adjust VR103, 104 to let the color temperature meet the specification x=0.281 +/- 0.003
y=0.311 +/- 0.003
e. Adjust external contrast key to let light output be 45±3 Ft-L.
f. Press "SELECT +" and "ADJUST -" to save the adjustment data.
g. Adjust VR301 to let light output be 31±0.5 Ft-L.
h. Turn power switch off.
5. Final Check
a. Enter final check area -- press "SELECT +" and "ADJUST +" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with full white pattern.
c. Press "SELECT +" and "ADJUST -" keys at a same time.
d. Check the light output is greater than 30Ft.L.
e. Adjust external contrast and brightness keys to minimum, the video and raster should be
disappear.
f. Check the performance of all modes can meet spec.

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
4
Confidence and Property
6. Focus Adjustment
a. Input mode 53.6KHz (SVGA5) with characters pattern.
b. Press "SELECT +" and "ADJUST -" keys at a same time.
c. Adjust focus VR of FBT to make "A" area focus clear.
A
video
raster
7. Convergence Adjustment
a. Input mode 53.6KHz (SVGA5) with purple cross hatch pattern.
b. Adjust 4-pole magnetic ring of Yoke to meet specification.
c. Input mode 53.6KHz (SVGA5) with yellow cross hatch pattern.
d. Adjust 6-pole magnetic ring of Yoke to meet specification.
e. Input mode 53.6KHz (SVGA5) with white cross hatch pattern.
f. Re-confirm the mis-convergence can meet spec.
B D
A A ≦0.2 mm
C E
B,C,D,E ≦0.3 mm
8. Power Saving Function Check
a. Input mode 53.6KHz (SVGA5) with full white pattern.
b. Set external contrast and brightness keys to maximum position.
c. Remove H-Sync only, the video and raster should be extinguished. The LED shows amber color
and the power consumption should be less than 60W.
d. Remove V-Sync only, the video and raster should be extinguished. The LED shows amber
color and the power consumption should be less than 5W.
e. Remove both H and V Sync, the power consumption should be less than 5W and LED shows
amber color.
f. Input H-Sync and V-Sync, the video should be exhibited again and LED on (green).

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
5
Confidence and Property
9. Geometry Specification for Production Line
(Table 2)
ITEM DESCRIPTION SPECIFICATION
1 HORI SIZE 270 ±4 mm
2 VERT SIZE 202 ±4 mm
3 SIDE PIN ≦2.0 mm
4 TOP/BOTTOM PIN ≦1.0 mm
5 SIDE BARREL ≦1.0 mm
6 TOP/BOTTOM BARREL ≦1.0 mm
7 TRAPEZOID ≦1.0 mm
8 VIDEO OFFSET ≦4.0 mm
9 PARALLELGRAM ≦2.0 mm
10 HORI LINEARITY ≦5 %
11 VERT LINEARITY ≦5 %
10. Eyelet parts
1. Q602 Heat sink

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
6
Confidence and Property
2. T303
3. IC202 Heat sink/ T302
4. M101 CRT socket

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
7
Confidence and Property
11. Touch-up parts
The component listed below must touch-up to avoid solder crack.
1. Q310: 3 points
2. D307: 3 points
3. L302: 2 points
4. CN601: 3 points

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
8
Confidence and Property
5. Q602: 3 points
6. C612: 2 points
7. M101: 8 points
12. Glue parts
1. G2 & G4 VR add glue to fix the position of VR

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
9
Confidence and Property
2. R607 add glue to fix the Heat sink
13. Wire Dressing parts
1. Left side view:
2. Right side view:

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Acer V551 (new) CRT Monitor Service Guide
Chapter 3 Alignment Procedure
10
Confidence and Property
3. Rear side view:
4. Left/Bottom degaussing fixed
5. Right/Bottom degaussing fixed