ViewSonic - VA-703B - VA-703M MONITOR - SCHEMATIC - POWER SUPPLY BACK-LIGHT INVERTER
Click on the schematic to Zoom In
BACK-LIGHT INVERTER
REPAIRING AND NOT THROWING AWAY
Showing posts with label VIEWSONIC. Show all posts
Showing posts with label VIEWSONIC. Show all posts
Friday, 5 April 2019
VIEWSONIC VA2012W - LCD MONITOR - HOW TO DISASSEMBLE
VIEWSONIC VA2012w - LCD MONITOR - HOW TO DISASSEMBLE
CLICK ON THE PICTURES TO MAGNIFY
The LCD module is designed so that the CCFL in it is
supplied by a Limited Current Circuit(IEC60950 or UL1950). Do not connect the
CCFL to hazardous Voltage Circuit.
Panel Source Identify
(1) ID label - The panel code “Q” for QDI panel and “T” for
Hannstar panel should be shown on the lower right side of ID label.
(2) UPC label - The panel code “Q” for QDI panel and “T” for
Hannstar panel should be shown on the lower right side of UPC label.
(3) Main board - The panel code “Q” for F/W version sticker
or silkscreen should show QDI panel and “T” for Hannstar panel on the main
board.
The MB board is a two-layer, single-landed. 12V DC power
from the power adapter enters the board through connector CN6. Other connectors
on the board are for audio speaker and button board .The VGA cable is a signal
cable that contains video signal, sync signal and DDC signal from PC VGA
adapter. This system board consists of 4 functional areas: flat panel
controller, flash ROM, power regulator and Audio amplifier.
Flat panel controller… NT68563HF (IC2)
The heart of the system board is the scalar chip of
NT68563HF. The scaler is a highly integrated flat panel display controller that
interfaces analog, digital, and video inputs. It combines a triple ADC, a DVI
compliant TMDS receiver, a multi-color on screen display (OSD) controller and
many other functions in a single chip. It provides user a simple, flexible and
cost-effective solution for various flat panel display products. The NT68563HF
operates at frequencies up to 205MHz (analog only), suitable for LCD monitor up
to UXGA resolution. The NT68563HF also build-in noise reduction function to
provide more stable video quality, spread spectrum to provide low EMI solution,
sRGB for video color space convert, post pattern for manufacture test.
Tuesday, 2 April 2019
VIEWSONIC VLCDS23719-1W [VG700] - TROUBLESHOOTING PROCEDURE
VIEWSONIC VLCDS23719-1W [VG700] - TROUBLESHOOTING PROCEDURE
Main Procedure
VIEWSONIC N2060 - 20 INCH TV-MONITOR - SCHEMATIC DIAGRAM - POWER [SMPS]
VIEWSONIC N2060 - 20 INCH TV-MONITOR - SCHEMATIC DIAGRAM - POWER [SMPS]
FACTORY PRESET DISPLAY MODES
CLICK ON THE PICTURES TO MAGNIFY
Monday, 1 April 2019
VIEWSONIC A90F - VCDTS23307-2R - SMPS - H-OUT AND V-OUT SCHEMATIC
VIEWSONIC A90F - VCDTS23307-2R - SMPS - H-OUT AND V-OUT SCHEMATIC
ViewSonicA90f+-1 _ VCDTS23307-2R - 19” Digital Controlled
Color Monitor – SMPS, Horizontal Output & Vertical Output Circuit Diagrams
CLICK ON THE SCHEMATICS TO ZOOM IN
SMPS SCHEMATIC
HORIZONTAL SCAN & OUTPUT
VERTICAL SCAN-OUT
SYSTEM CONTROL & MEMORY
TPW-697 _ POWER TRANSFORMER – 5061369700
TFB-280T _ TRAQNS.FLYBACK COLOR – 5062628031
TFB-280L _ TRAQNS.FLYBACK COLOR – 5062628032
Power supply working frequency - constant between 30.25 kHz
and 31.25 kHz, R817A adjust the frequency
VIEWSONC - VX910 - MODEL NO.VS10162 HOW TO UPDATE FIRMWARE - - MONITOR
HOW TO UPDATE FIRMWARE - VIEWSONC VX910 - Model No.VS10162 - MONITOR
VX910 - Model No.VS10162 - ViewSonic 19” Color TFT LCD Display
When you received a received monitor, check whether the
firmware version. If not, follow
procedure to upgrade to the latest version.
Equipment needed
* VX710
* PC ( Personal computer )
* LPT cable
* Fixture (LM5ISP)
* Firmware upgrade program.
CONNECTION
To setup ISP environment:
* Hardware: PC or notebook, parallel (printer) cable, ISP
tooling.
* Software: If OS was Win2000 or WinXP , install
“PORT95NT.exe”
* In order to ensure can execute ISP program, set BIOS in PC
or Notebook.
* Double-click the “ PORT95NT.exe” in Windows & install
the program.
* Keep on press “Next” (4) times to go through the
installation processes.
* Choose “Typical” then press “Next”
* Keep on press “Next” (4) times to go through the
installation processes.
Installation completed, restart the PC or notebook.
VIEWSONIC - VX910 BIOS SOFTWARE UPGRADE - 19” COLOR TFT LCD DISPLAY.
.jpg)
BIOS SOFTWARE UPGRADE - VIEWSONIC - VX910 19” Color TFT LCD Display.
UPGRADE THE BIOS SOFTWARE - ViewSonic VX910 19” Color TFT
LCD Display.
Model No.VS10162
UPGRADE PROCEDURE
After installation, shortcuts may be found in the settings
path or the program menu (default setting). [See the previous post here, for more details]
* The security file is a key to use ISP functions; press the
"OK" button.
* The warning shown is used to remind the user that a CPU rate
that differs from IIC protocol may cause the ISP functions to fail; press the
"OK" button.
* As shown in Fig, press the "Create Security File"
button to key in a security code, and use the slider bar to adjust the speed of
the IIC bus.
* Fig below shows the settings for the ISP software's security
code. It requires two command numbers, and the commands must be keyed in
sequentially: 7C, 4C, 77. The command numbers and commands must be set by the
user while coding. For more details, please refer to section 6 boot code of
ISP.
Using ISP to program MCU
* As shown in Fig, select the MTV type first, load the binary
or intel hex file to be programmed into the MCU, click "OK," then
press the "RUN" button.
* If the user changes the MTV type, the file must be loaded
again, as the previously loaded file will be cleared.
* CRC (cyclic redundancy check): the host can check the result
in the CRC register instead of reading every byte in flash.
* The Check MCU CRC OK message indicates that the host has
verified the program's CRC; see Fig.
VIEWSONIC G90FB-4 MONITOR - SMPS - SYSCON AND H-OUT - SCHEMATIC (CIRCUIT DIAGRAM)
VIEWSONIC G90FB-4 Monitor - SMPS - SYSCON and H-OUT - SCHEMATIC (Circuit Diagram)
ViewSonic G90FB-4 - Model No. VS10794 - 19” Digital
Controlled Color Monitor - Schematic Diagrams _ Power, Horizontal Out & System control
Click on the schematics to Zoom In
SMPS
Before check SW.REG
Variable output: 60V
Constant output: 6.3V, 12V, 83V，180.V, －12V
Adjustment conditions and precautions
Adjustments should be undertaken only on those necessary
elements since most of them have been carefully preset at the factory.
The B+ control block of the SAA4849 has the same behavior as
the TDA4856 with adapted threshold voltages. The circuit allows the user to
choose the trigger edge of the HDRV signal and the polarity of the output stage
via I2C-Bus. The B+ control function block of the SAA4849 consists of an
Operational Trans conductance Amplifier (OTA), a voltage comparator, a
flip-flop and a discharge circuit. This configuration allows easy application
for different B+ control concepts.
Main adjustments:
Power supply Troubleshoot
The horizontal part contains a PLL, which works over the
full frequency range from 25 kHz to 140 kHz. This range can be reduced by a over
and an upper frequency limit (Write Once Registers HPMAX and HPMIN).Via I2C bus
the number of 48MHz clock cycles is sent through the register. The slewing
speed during mode change is also programmable in a write once register (HSLEW) After
the clocks for the HPLL are switched on, the HPLL starts with a fixed free
running frequency of 60 kHz. The H-drive pulses are not active and the start up
procedure is inhibited. The default setting of register bit HCONTROL [0] will cause
the HPLL to slew, not switch. To the free running frequency defined in the I2C
register HPFREE (the default value is also 60 kHz).Independent on H-syncs which
are possibly present. The HPLL will slew to that free running frequency. To
achieve an always defined starting point for the startup procedure, this
procedure cannot be interrupted.
Horizontal scan & output schematic
Micro-controller Section
The micro controller (IC101) core is a 80C51 type. The micro
clock frequency of 12 MHz is derived from the Xtal oscillator, which is running
at 48MHz. The DDC interface is suitable to handle DDC2 by a modified hardware I2C-bus
interface .Standard high current ports,3 ADC pouts with voltage inputs and 4
static standard8 bit DAC outputs (low interference) and one PWM output for
digital control application are implemented. The central processing unit (CPU) manipulates
operands in two memory spaces. These are the 1024byte internal data memory (consisting
of 256 bytes standard RAM and 768 bytes AUX-RAM) and 48K-byte internal program memory.
The program memory of the SAA4849 consists of 48K bytes ROM. The SAA4849P
provides sync. Processing with full auto sync. Capability, a flexible SMPS
block and an extensive set of geometry control facilities. Further the IC
generates the drive waveforms for DC coupled vertical boosters to the TDA8172.
VIEWSONIC - VS10859 MONITOR - FLICKER ADJUSTMENT - SPARE PART LIST
VIEWSONIC - VS10859 MONITOR - FLICKER ADJUSTMENT - Spare part list
Model - VS10859
Product name: VA2012wb-1-W _ VA2012w/wb-2-W _ VX2025wm-W
LED flicker appeared when change the power saving mode to
normal picture in ORT test. In order to solve the abnormal phenomenon, power BD
modified.
* Before change:
Power board P/N: AS08B532009
Description: PWR MODULE (DTA) EADP-64CF B,90~264V GP. [Rev:
A]
* After change:
Power board P/N: AS08B532009
Description: PWR MODULE (DTA) EADP-64CF B, 90~264V GP. [Rev:
B]
* Before change:
Power board P/N: AS08B532009, Description: PWR
MODULE (DTA) EADP-64CF B, 90~264V GP Rev: Transformer P/N:MV-CE 5048A
,circuitry qty:4,Diode ZD1:7.5A.
* After change:
Power board P/N: AS08B532009, Description: PWR
MODULE (DTA) EADP-64CF B,90~264V GP Rev: B Transformer P/N:MV-CE 5048B
circuitry qty:5,Diode ZD1:12A.
Click on the pictures to Magnify
Spare Part List
Item
|
Description
|
Ref. P/N
|
Location
|
|
1
|
Accessories:
|
Power cable
|
DM333181801
|
Power cable
|
2
|
Audio cable
|
DDW9ZAPA009
|
Audio cable
|
|
3
|
VGA cable
|
DDL7VDPC005
|
VGA cable
|
|
4
|
Board Assembly:
|
Power board
|
AS08B532009
|
Power board
|
5
|
main board
QDI 21W0VAMB002
|
1SW0VAMB009
|
Main board for QDI
|
|
6
|
main board
AUO 21W0VAMB002
|
1SW0VAMB025
|
Main board for AUO
|
|
7
|
Button board 23W0VABB009
|
1SW0VABB003
|
Button board
|
|
8
|
Inverter board
|
AS023360D18
|
Inverter board
|
|
9
|
Cabinets:
|
Front bezel assy black
|
34W0VALB000
|
front bezel ass'y
|
10
|
back cover assy black
|
25W0VALC007
|
back cover assy
|
|
11
|
Cables:
|
Cable MB-LCD
|
DD0L9VLC023
|
Cable MB-LCD
|
12
|
Cable MB-BB
|
DDW0VABU007
|
Cable MB-BB
|
|
13
|
Cable MB-INV
|
DD0W0EIV008
|
Cable MB-INV
|
|
14
|
Documentation:
|
User manual + CD wizard
|
HGW0VA01013
|
User manual
|
15
|
Electronic
Components: |
20" QD20AL01 REV.01 GP
|
AA20AL01004
|
QDI LCD panel
|
16
|
20" QD20AL01
REV.01 A- GP
|
AA20AL01012
|
QDI LCD panel 2nd source
|
|
17
|
20"AUO M201EW01 V.0 GP
|
AAM201EW007
|
AUO LCD panel
|
|
18
|
LCD 20" M201EW01
V.0 GP
|
AAM201EW058
|
AUO LCD panel 2nd source
|
|
19
|
Speaker assy
|
DN0TE130F01
|
speaker assy
|
|
20
|
Miscellaneous:
|
Screw
|
MF30040IJB3
|
SCREW F 3.0*4.0-I(MC) GP
|
21
|
Screw
|
MF30060BBJ6
|
SCREW M3.0*6, B(NI) GP
|
|
22
|
LCD film
|
JXW0ZB01019
|
LCD FILM
|
|
23
|
Screw
|
MF40140IJ29
|
SCREW F4.0*14-I(BNI) GP
|
|
25
|
RUBBER PLUG VESA
|
GAL9V002014
|
RUBBER PLUG VESA
|
|
HINGE COVER
|
EBW0VA03020
|
HINGE COVER W0VA
|
||
27
|
Packing Material:
|
EPE bags
|
HAL0T002019
|
EPE bags
|
28
|
Carton
|
HFW0VA03015
|
carton
|
|
29
|
End cap (L)
|
HBW0VA01019
|
cushion
|
|
30
|
End cap (R)
|
HBW0VA02015
|
cushion
|
|
31
|
Plastics:
|
Stand assy
|
26W0VASA016
|
Stand ASSY
|
base assy
|
38W0VABS010
| |||
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