AOpen A70PF User manual

A70PF(RX-777NS) 1 / 33
A70PF
Service Manual

A70PF(RX-777NS) 2 / 33
TABLE OF CONTENTS
WARNING---------------------------------------------------------------------------------------3
A. IMPORTANT SAFETY INSTRUCTION---------------------------------------3
B. SPECIFICATIONS ----------------------------------------------------------------------4
C. TIMING CHART-------------------------------------------------------------------------5
D. ADJUSTMENT CONTROL LOCATION--------------------------------------6
E. ADJUSTMENT PROCEDURE-----------------------------------------------------7
F. BLOCK DIAGRAM--------------------------------------------------------------------12
G. TROUBLE SHOOTING HINTS--------------------------------------------------13
H. BILL OF MATERIAL ----------------------------------------------------------------20
I. EXPLODED DIAGRAM------------------------------------------------------------29
J. SCHEMATIC DIAGRAM-----------------------------------------------------------30
K. PCB LAYOUT DIAGRAM----------------------------------------------------------31

A70PF(RX-777NS) 3 / 33
WARNING
To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is
inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified
monitor engineer.Contact the local dealer or the nearest AOpen branch office if you need help.
A. IMPORTANT SAFETY INSTRUCTION
Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in the
user's manual for this product.
1. Read all of these instructions.
2. Save these instructions.
3. Follow all warnings and instructions marked on the product.
4. Unplug this product from the wall outlet before cleaning.Do not use liquid cleaner or aerosol
cleaner, use a damp cloth for cleaning.
5. Do not use this product near water.
6. Do not place this product on an unstable cart,stand or table.The product may fall,causing serious
damage to the product.
7. Slots and openings in the cabinet and the back or bottom are provided for ventilation,to ensure
reliable operation of the product and to protect it from overheating.Those openings must not be
blocked or covered.The openings should never be blocked by placing the product on a bed,sofa, rug,
or other similar surface.This product should not be placed in a built-in installation,since proper
ventilation is provided.
8. This products should be operated with the type of power source indicated on the marked label.
If you are not sure of the type of power is available, consult with your dealer or local power company.
9. This product is equipped with a 3-wire grounding type plug,a plug having a third (grounding)
pin.This plug will only fit into a grounding-type power outlet.This is a safety feature.If you are
unable to insert the plug into the outlet,contact your electrician to replace your obsolete outlet.Do
not damage the purpose of the grounding-type plug.
10. Do not allow anything to rest on the power cord.Do not locate this product where persons will walk
on the cord.
11. Never push any kinds of objects into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock.Never spill any kinds
of liquid on the product.
12. Do not attempt to service this product yourself,as opening or removing covers may expose you to
dangerous voltage points or other risk.Refer all servicing to service personnel.
13. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions.
a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally,when the operating instructions are followed.Adjust
only those controls involved in the operating instructions ,since improper adjustment of
other controls may result in damage and will often require extra work by a qualified
technician to restore the product to normal operation.
e. If the product has been dropped or the cabinet has been damaged.
f. If the product exhibits a distinct change in performance,indicating a need for service.

A70PF(RX-777NS) 4 / 33
B.SPECIFICATIONS
1. Screen 17” F&S 0.25mm,Antistatic coating
2. Visible Image Area 16.02 inch
3. Active Display Area 306mm (H) × 230mm (V)
4. Synchronization Range
Horizontal
Vertical 30 – 72 KHz 50 – 160 Hz
5. Power Source 100 – 240 Vac , 60/50 Hz
6. Power Consumption 75W (max.)
7. Input Signal
Video
Sync. Analog R.G.B. , 0.7Vp-p / 75 Ohm TTL level,positive or negative polarity
8. Connection Type 15 Pin D Type
9. Resolution 1280 × 1024 pixels
10. Color Temperature 9300ºK / 6500ºK
11. Dimension (W×H×D) 406 × 417 × 433 (mm)
12. Monitor Weight 15.8Kg
13. Base Operation
Tilt
Swivel - 5º / + 15º - 45º / + 45º
14. Power Saving
ON
OFF ＜75W
＜5W
15. Signal Connector Pin Assignment
Pin No.
1. Red
2. Green
3. Blue
4. Ground
5. Self Test
6. Red Ground
7. Green Ground
8. Blue Ground
9. Not Connected
10. Sync. Ground
11. Ground
12. SDA
13. Horizontal Sync.
14. Vertical Sync.
15. SCL

A70PF(RX-777NS) 5 / 33
C.TIMING CHART
Preset
Modes
VGA
640
×
480
VGA
720
×
400
VESA
640
×
480
VESA
640
×
480
VESA
800
×
600
VESA
800
×
600
VESA
1024
×
768
SIEMENS
800
×
600
VESA
1280
×
1024
VESA
1024
×
768
Dot Rate
(MHz) 25.175 28.322 31.50
36.000 49.50 56.25 78.750 67.5 108.00 94.5
F.H
(KHz) 31.469 31.469 37.500 43.269 46.87 53.674 60.023 63.92 63.98 68.677
A-period
(uS) 31.778 31.778 26.667 23.111 21.333 18.631 16.660 15.644 15.630 14.561
B- Active
(uS) 25.422 25.422 20.317 17.778 16.162 14.222 13.003 11.852 11.852 10.836
C- Sync
(uS) 3.813 3.813 2.032 1.556 1.616 1.138 1.219 0.948 1.037 1.016
D-Back
Porch 1.907 1.907 3.810 2.222 3.232 2.702 2.235 2.370 2.296 2.201
E-Front
Porch 0.318 0.318 0.508 1.556 0.323 0.569 0.203 0.474 0.444 0.508
F . V
(Hz) 59.941 70.087 75.000 85.0 75.000 85.061 75.029 100.0 60.020 84.997
A- Period
(Ms) 16.683 14.268 13.333 11.764 13.333 11.756 13.328 9.997 16.661 11.765
B- Active
(mS) 15.253 12.711 12.800 11.093 12.800 11.179 12.795 9.387 16.005 11.183
C- Sync
(mS) 0.064 0.064 0.080 0.069 0.064 0.056 0.050 0.047 0.047 0.044
D-Back
Porch 1.049 1.112 0.427 0.578 0.448 0.503 0.466 0.548 0.594 0.524
E-Front
Porch 0.254 0.222 0.026 0.023 0.021 0.019 0.017 0.016 0.061 0.015
H/V
SYNC －. － － . ＋ －. － ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋
Interlaced NON NON NON NON NON NON NON NON NON NON
A : Period
B : Active
C : S
y
nc. Width
D : Back Porch
E : Front Porch
C

A70PF(RX-777NS) 6 / 33
D.ADJUSTMENT CONTROL LOCATION

A70PF(RX-777NS) 7 / 33
E. ADJUSTMENT PROCEDURE
ITEM
P
rogram Menu.
﹟Test Meter
﹡Test Point
﹫Pattern Operation
Adjusting
Value
A
B+
Adjust
﹟Digital Voltmeter
﹡D510 Negative
﹫Crosshatch Pattern
(31.5KHz,640x480)
1. Make the adjustment to the value shown at right
by turning the VR501 on the main PCB.
15.5V
±0.2V
B
High Voltage
Adjust
﹟Digital Voltmeter
﹟High Voltage
Probe
﹡Anode Cap-GND
﹫Crosshatch Pattern
(31.5KHz,640x480)
1. Turn the power switch of the monitor OFF.
2. Connect high voltage probe to Anode Cap and
GND.
3. Turn the power switch of the monitor ON.
(15 minutes)
4. Make the adjustment to the value shown at right
by turning the VR601 on the main PCB.
25.5KV
±0.1KV
C
Preset
Adjust
﹫Crosshatch
(31.5KHz,640x480)
1. Uplug the power cord of the monitor.
2. Hold key,then plug the power cord of
the monitor.
3. Hold key,make sure into preset
picture,if not ,please return 1-2.
4. Please following the procedure of selection and
adjusting an item using the OSD system as below
steps for main function adjusent.
Step 1 : Press and relese the OSD control knob to
activate the OSD menu.
Step 2 : Press or key to highlight the desired
option of OSD icon.
Step 3 : Press and release key to acress the
option.The color of the inner area of the
OSD will changed from blue to green.
Step 4 : To make your adjustment,press or
key to decrease the setting.
Step 5 : Press and release key to store
the change.the color of the inner area will
go back to blue.You can select select other
function to make adjustment by or key.
Also you can select exit icon or press
key to exit the OSD menu.
Contrast :
MAX.
Brightness
MAX.
H-Size :
306mm
V-Size :
230mm
H-Posi. :
Center
V-Posi :
Center
Other adj. :
Best Point

A70PF(RX-777NS) 8 / 33
ITEM
P
rogram Menu.
﹟Test Meter
﹡Test Point
﹫Pattern Operation
Adjusting
Value
D
Background
White
Balance
Adjust
﹟Color Analyzer
﹫R.G.B off
(68KHz,1024x768)
1. Set the contrast to MAX.,Brightness to Y=0.7
set color is 9300°Kusing the OSD.
2. Set the OSD to COLOR of sub menu and press
knob.
3. Make the adjustment R.G.B BIAS low light to
the value shown at right by using and key.
Y = 0.4
±0.1FL
x = 0.283
±0.015
y = 0.297
±0.015
E
White
Balance
Adjust
﹟Color Analyzer
﹟Oscilloscope
﹡Cathode G
﹫3” block
(68KHz,1024x768)
1. Move the OSD to the R.G.B. DRIVE.
2. Move the OSD to the G DRIVE and make the
adjustment to the value shown at right by using
and key.
3. Move the OSD to the R,B-DRIVE and make the
Adjustment to the value shown at right by using
and key.
37VP-P
Y=58FL
x = 0.283
±0.015
y = 0.297
±0.015
F
ABL
Adjust
﹟Color Analyzer
﹫Full White
(68KHz,1024x768)
1. Set the contrast to MAX.,Brightness to MAX.
2. Make the adjustment to the value shown at right
by adjustment ABL on the OSD menu.
Y = 33FL ±3
G
Other
Function
Seting
﹫Full White
(85Hz 1024*768)
1. Set the FREQ. to 73
2. Set the OSD to PROVIEW
3. Set the BURN to Disable
4. Set the DEFO to TDA9116/9118

A70PF(RX-777NS) 9 / 33
ITEM
P
rogram Menu.
﹟Test Meter
﹡Test Point
﹫Pattern Operation
Adjusting
Value
H
Dynamic
Focus
Adjust
﹟Oscilloscope
﹡FBT Pin14
﹫Full White
(31.5KHz,640x480)
1. Set the contrast to MAX.,and adjustment
Brightness to the raster just appear.
2. Make the adjustment to the value shown at right
by adjust the VF on the OSD menu.
3. Make the check to the value shown at right by
adjust the HF on the OSD menu.
VF :
150(17”)
±10VP-P
HF :
350(17”)
±10VP-P
I
Purity
Adjust
﹫Magenta color
(31.5KHz,640x480)
1. Adjust the purity magnet is in magneta color.
2. Turning two overlapping pawels in opposite
directions.
3. Move them until they are at the same angle,
9 o’clock and 3 o’clock respectively.
J
Static
Convergence
Adjust
﹫Magenta color
(31.5KHz,640x480)
1. Open the two pawels of the 4 pole magnets to
allow the red and blue vertical lines to unite.
2. Open and rotate the two pawels at a contrast
angle so that the red and blue horizontal lines
can unite.
3. If the vertical lines deviates,open the two powals
at the deviation position and make a monitor
adjustment by changing its angle.
4. Display white crosshatch pattern.
5. Make the red and blue vertical lines at the
center unite with the green by opening the two
6 pole pawels.
6. Rotate the two pawels at contrast angle so that
the red and blue horizontal lines can unite with
the green.
7. If the vertical lines deviate,change the angle of
Pawels from the deviation position.

A70PF(RX-777NS) 10 / 33

A70PF(RX-777NS) 11 / 33

A70PF(RX-777NS) 12 / 33
F.BLOCK DIAGRAM
200-200-P6NS Video Board DY
R,G,B CRT
Signal Cable
H,V sync HV
V H Focus
G1
G2
200-100-P6NS Main Board
80V
55V
15.5V
Power Cord 7.5V
AC100-240V
-13V
SMPS
I501
KA384
2
MCU
IC901
EMC6700
Horizontal Def.
O/P Stage
Q703,D709
Voltage
Regulator
D502,D508,
D510,D513,
D509
H/V
Processor
IC601
TDA9116/8
EEPROM
IC901
24LC08
Video PerAmp
OSD
IC201
LM1237
Video AMP
IC203
LM2469
Vertical
Booster
IC301
TDA8172
Booster
Q719,D719
DC –restore
IC202
LM2480
H-Driver
T702,Q702
Control
PCB
FBT
T701
Degauss
Dynamic Focus
T703,Q713

A70PF(RX-777NS) 13 / 33
IC501 (7)
＞14 V ?
G. TROUBLE SHOOTING HINTS
No
Yes
No
Yes
No
Yes
No
Yes
T501 (7)
160 V ?
IC501(2)
2.5V ?
D510 (-)
15.5V ?
CHECK
F501,D514 ,
D515,D516,
D517
CHECK
IC501,R539,
D505,ZD551
CHECK
D510,Q501,
Q
508
CHECK
IC501,Q504
CIRCUIT
SHORT
T501(7) VOLTAGE
AC120V IN 160V
AC220V IN 294V
AC230V IN 308V
NO POWER

A70PF(RX-777NS) 14 / 33
No
Yes
No
Yes
No
Yes
No
Yes
IC301 (2)
12 V ?
IC301 (4)
-10.5 V ?
IC301 (1)
0.7 VP-P ?
IC301 (5)
48 VP-P ?
CHECK
15V
LINE
CHECK
-12V LINE
CHECK
IC601
CHECK
IC301
BRIGHT HOR. LINE
APPEAR ON THE
SCREEN
CHECK
CRT DY

A70PF(RX-777NS) 15 / 33
No No No
Yes Yes
No No
Yes Yes No
No
Yes
No
Yes
No
Yes
CRT G1
-20V~
-80V ?
HEATER
VOLT
6.3 V ?
CRT
EHT
26KV ?
CRT G2
600V ?
CRT
KR,KG,KB
VOLTAGE
?
CHECK
B+ VOLT
7.2 V ?
Q710 (E)
-0.6V ?
CHECK
Q711(B)
<0.7 V ?
CHECK
IC601
CHECK
IC901
CHECK
Deflection
Horizontal
CKT
CHECK
T701 FBT
VIDEO CKT
FAILURE
CHECK
IC901
Surrounding
CKT
NO
RA
S
TER
CHECK
CRT TUBE
IC901(4)
-1.5V~-1.8V
CHECK
IC901(24)
>2.0 V ?
CHECK
VIDEO
CKT

A70PF(RX-777NS) 16 / 33
Yes
No
No Yes No Yes
No Yes No
No
No Yes Yes
Yes
No Yes No
No
Q703 (C)
1.0 ~ 1.2
KVP-P?
Q703 (B)
DRIVE
PULSE
Q702 (G)
DRIVE
PULSE
CHECK
B+ 51V
CHECK
B+ = 15V?
CHECK
NO RASTER
CHECK
FBT
NO POWER
REPLACE
Q608
CHECK
15V LINE
CHECK
IC601
DEFLECTIVE
HOR. CKT
Q703
FAILURE
CHECK
T702
Q601,
Q602 (B)
BOUT
Q719,(G)
DRIVE
PULSE?
CHECK
Q719
CHECK
IC601
SURRONDING
CKT
FBT (3)
51V?

A70PF(RX-777NS) 17 / 33
Yes
No
No
Yes
No
Yes
No
Yes
IC901(40)
(41) H/V
SIGNAL
?
IC901(20)
PS 0
0 V ?
Q505 (C)
7.0 V ?
CHECK
Q511 (B)
0 V ?
CHECK
PC
CHECK
IC901
CHECK
IC901
CHECK
Q505
CHECK
Q511
VESA STANDARD DPMS
ITEM
MODE H/V Sync. VIDEO LED
NORMAL ON/ON NORMAL GREEN
STAND BY OFF/ON OFF ORANGE
OFF OFF/OFF OFF ORANGE
IC901 PIN40,PIN41 SIGNAL.
PIN40 PIN41
NORMAL H H
STAND BY H L
OFF L L
OFF MODE
FAILURE

A70PF(RX-777NS) 18 / 33
No
Yes
No
Yes
No
Yes
No
Yes
P903
OK ?
Q902 (c)
15 V ?
Q903 (E)
7 V ?
Q904 (B)
2.5V ?
CHECK
15V LINE
CHECK
IC901
CHECK
7V LINE
CHECK
Q904
CHECK
Rotation Coil
NO
ROTATION

A70PF(RX-777NS) 19 / 33
Example:Missing Green
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
NO CHARACTERS
MISSING ONE
CRT KG
80V0-P?
IC203 (3)
39 VP-P ?
IC203
(8)
12 V ?
IC201
(10.18)
5V ?
IC201 (6)
0.7VP-P ?
CHECK
IC201
NO
RASTER
CHECK
IC203
CHECK
12V
CHECK
IC201
CHECK I/P
SIGNAL

A70PF(RX-777NS) 20 / 33
H. Bill of Material
No. Parts Number Parts Description Unit Q'ty Location
1 002-L16-AOPEN USER MANUAL EA 1
2 005-009-AOPEN-C CARTON EA 1
3 200-100-P6NS MAIN/B REV:B+++ Brite Plu EA 1 PCB
,
4 200-200-P6NS CRT/B REV:B+ Brite Plus EA 1
5 200-700-RXP6 CONTROL PCB REV:B+ EA 1
6 210-100-0256 R-CF. 10 ohm 1/2W +-5%. EA 1 R631,
7 210-100-0256 R-CF. 10 ohm 1/2W +-5%. EA 1 R734,
8 210-100-0456 R-CF. 10 ohm 1/4W +-5%. EA 1 R762
,
9 210-101-0456 R-CF. 100 ohm 1/4W +-5%. EA 10 R612,R611,R918,R926,R927,R976,R977,R912,
R663
,
R7B1
,
10 210-101-0856 R-CF. 100 ohm 1/8W +-5%. EA 6 R205
,
R235
,
R265
,
R281
,
R284
,
R285
,
11 210-101-0856 R-CF. 100 ohm 1/8W +-5%. EA 11 R664,R942,R943,R953,R982,R984,R985,
R918A
,
R782
,
R711A
,
R952
,
12 210-101-0856 R-CF. 100 ohm 1/8W +-5%. EA 1 R516
,
13 210-102-0256 R-CF. 1K ohm 1/2W +-5%. EA 2 R735,R736,
14 210-102-0456 R-CF. 1K ohm 1/4W +-5%. EA 4 R754,R7A8,R525
,
R740
,
15 210-102-0856 R-CF. 1K ohm 1/8W +-5%. EA 3 R240
,
R270
,
R210
,
16 210-102-0856 R-CF. 1K ohm 1/8W +-5%. EA 6 R533
,
R626
,
R974
,
R993
,
R546
,
R793
,
17 210-102-0856 R-CF. 1K ohm 1/8W +-5%. EA 1 R755
,
18 210-103-0456 R-CF. 10K ohm 1/4W +-5%. EA 4 R529
,
R536
,
R983
,
R610
,
19 210-103-0856 R-CF. 10K ohm 1/8W +-5%. EA 2 R291
,
R288
,
20 210-103-0856 R-CF. 10K ohm 1/8W +-5%. EA 8 R651,R931,R615,R590,R730,R510,R630,R930
,
21 210-103-0856 R-CF. 10K ohm 1/8W +-5%. EA 3 R606
,
R724
,
R741
,
22 210-104-0256 R-CF. 100K ohm 1/2W +-5%. EA 1 R2A3
,
23 210-104-0256 R-CF. 100K ohm 1/2W +-5%. EA 1 R770
,
24 210-104-0456 R-CF. 100K ohm 1/4W +-5%. EA 2 R731
,
R508
,
25 210-104-0456 R-CF. 100K ohm 1/4W +-5%. EA 1 R725
,
26 210-104-0856 R-CF. 100K ohm 1/8W +-5%. EA 1 R767,
27 210-105-0456 R-CF. 1M ohm 1/4W +-5%. EA 1 R757,
28 210-112-0856 R-CF. 1.1K ohm 1/8W +-5%. EA 1 R745
,
29 210-114-0256 R-CF. 110K ohm 1/2W +-5%. EA 1 R737
,
30 210-123-0456 R-CF. 12K ohm 1/4W +-5%. EA 1 R303
,
31 210-123-0856 R-CF. 12K ohm 1/8W +-5%. EA 1 R666
,
32 210-124-0856 R-CF. 120K ohm 1/8W +-5%. EA 1 R515
,
33 210-133-0856 R-CF. 13K ohm 1/8W +-5%. EA 1 R710,
34 210-153-0456 R-CF. 15K ohm 1/4W +-5%. EA 1 R602,
35 210-153-0856 R-CF. 15K ohm 1/8W +-5%. EA 1 R608
,
36 210-154-0856 R-CF. 150K ohm 1/8W +-5%. EA 1 R589
,
37 210-182-0856 R-CF. 1.8K ohm 1/8W +-5%. EA 1 R991
,
38 210-182-0856 R-CF. 1.8K ohm 1/8W +-5%. EA 1 R614
,
39 210-200-0456 R-CF. 20 ohm 1/4W +-5%. EA 1 R973
,
40 210-202-0856 R-CF. 2K ohm 1/8W +-5%. EA 1 R305,
41 210-203-0456 R-CF. 20K ohm 1/4W +-5%. EA 1 R914,
42 210-203-0856 R-CF. 20K ohm 1/8W +-5%. EA 2 R545
,
R621
,