Philips 190B7 User manual

19”LCDColorMonitor 190B7
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Service
Service
Service
Horizontal Frequency
30- 83KHz
TABLEOFCONTENTS
Description Page Description Page
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
Table Of Contents...........…......................................………….1
Revision List.....................................................…………….2
Important Safety Notice……………….................................3
1. Monitor Specifications……….....................................…..4
2. LCD Monitor Description………..………..........................5
3. Operation instructions……………...........................…....6
3.1General Instructions………………………..…..…………6
3.2 Control buttons…………..……………………………………6
3.3 Adjusting the Picture…….......................................…..7
3.4 Connecting to the PC …….............…….…...........……....11
4. Input/Output Specification...........................…………….12
4.1 Input Signal Connector................................…………..12
4.2 Factory Preset Display Modes......................……..........13
4.3 Pixel Defect Policy………………………………..…………14
5. Block Diagram……………………………….……................16
5.1 Monitor Exploded View……………….…………...............16
5.2 Software Flow Chart...................................………….....17
5.3 Electrical Block Diagram..................……………….........19
6. Schematic Diagram…….................................……….........21
6.1 Main Board…….……………….……………………………21
6.2 Power Board…………………………………..…………………26
6.3 Audio Board…….…………………………..…………………28
7. PCB Layout.....……...............................……………………..29
7.1 Main Board.....……................................……..…………......29
7.2 Power Board.…….........................…..…………….............32
7.3 Audio Board………..…………………………..…………………35
7.4 Key Board………...………………………………………………35
7.5 USB Board…….………………………………………………35
8. Wiring Diagram……………………………………………….…..36.
9. Mechanical Instructions.....…….............……………..…..........37
10.Trouble shooting…..…………………………………...……..45
11. Repair Flow Chart…….…….……………………………………47
12. ISP Instructions..…..........................………………..............52
13. DDC Instructions……......…….............………….................58
14. White Balance, Luminance Adjustment……….................72
15. Spare Parts List...……..................……………........................73
16. Different Parts List...……….....……………........................86
17. General Product Specification……………………………….105
GB 3138 106 10506

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Revision List
Version Release Date Revision History
A00 April.10, 2006 Initial release, Draft Version
A01 Jun.15, 2006 Add CTV Model 190B7CB/27,
190B7CG/00, 190B7CS/27 in Item 16
A02 Sep.11, 2006
Add CTV Model 190B7CB/00,
190B7CB/69, 190B7CB/75,
190B7CB/93, 190B7CS/69,
190B7CS/75, 190B7CS/96 in Item 16
A03 Sep.18, 2006 Make some Engineering Changes
in Item 15 and Item 16
A04 Oct.24, 2006 Add Service Kit in Page 73
A05 Nov.10, 2006 Revise Service Kit in Page 73
A06 Nov.29, 2006 Add DDC Instruction for OSD SN in Item 13
A07 Dec.05, 2006 Add OSD SN Kit in Page 73
A08 Jan.17, 2007 Add To Lock/Unlock OSD function in Page 7

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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all Philips Company** Equipment. The
service procedures recommended by Philips and described in this service manual are effective methods of
performing service operations. Some of these service operations require the use of tools specially designed for the
purpose. The special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read
in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. Philips could not possibly know, evaluate and advise the service trade of all conceivable ways
in which service might be done or of the possible hazardous consequences of each way. Consequently, Philips has
not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is
not recommended by Philips must first satisfy himself thoroughly that neither his safety nor the safe operation of
the equipment will be jeopardized by the service method selected.
* * Hereafter throughout this manual, Philips Company will be referred to as Philips.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create
shock, fire,
or other hazards.
Under no circumstances should the original design be modified or altered without written permission from Philips.
Philips
assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open. AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION
OF THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the
panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth
may damage the panel.)

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1. Monitor Specifications
Screen type Active matrix - TFT LCD
Panel Type LM190E03-TLBD
Size 19"
Pixel pitch 0.294mm(H) x 0.294mm(V)
Separate Sync TTL level, input impedance 2.2k OHM terminate
Horizontal Frequency 30kHz – 83kHz
LCD Panel
Vertical refresh rate 56Hz - 76Hz
15pin D-SUB
Input Connector
24pin DVI
1280 x 1024 at 76Hz (analog input)
Maximum Resolution
1280 x 1024 at 76Hz (digital input)
Display Colors 16.2 M
Video dot rate 140 MHz
Recommended Resolution 1280 x 1024 at 60Hz (digital input)
Plug & Play VESA DDC2B
Power Consumption Power on: < 40 W
Power off: < 1 W
Input Video Signal 0.7 Vp-p, input impedance, 75 ohm @DC
Tilt -5° ～25°
Active Viewing Area Horizontal: 376.3mm;Vertical: 301.1 mm
Power Source 100-240 VAC, 50/60 Hz
Environmental
Considerations
Operating Temp: 5°C to 40°C
Storage Temp.: -20°C to 60°C
Relative Humidity: 20%-80%
Weight (Net) 6.14kg
Cabinet color
190B7CG: Light Gray
190B7CB: Black
190B7CS: Silver

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2. LCD Monitor Description
The LCD MONITOR will contain a main board, PWPC board, keypad board, which house the flat panel control
logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Video signal, DDC
Flat Panel and
CCFL backlight
Keyboard
RS232 Connector
For white balance
adjustment in factory
mode
CCFL Drive.
AC-IN
100-240V
Monitor Block Diagram
HOST Computer
A
udio Board
Main Board
PWPC board
(Included: adapter and inverter)

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3. Operation instructions
3.1 General Instructions
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the
monitor. By changing these settings, the picture can be adjusted to your personal preferences.
- The power cord should be connected.
- Connect the video cable from the monitor to the video card.
- Press the power button to turn on the monitor, the power indicator will light up.
3.2 Control Buttons
Front View

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Rear View
3.3 Adjusting the Picture
This is a feather in all Philips LCD monitors. It allows an end user to adjust screen performance of the monitors
directly through an on-screen instruction window. The user interface provides user-friendliness and ease-of-use
when operating the monitor.
When you press the button on the front control of your monitor, the On-Screen Display (OSD) main controls
window will pop up and you can then start making adjustments to your monitor’s various features. Use the
or the keys to make your adjustments.
To Lock/Unlock OSD function (User Mode)
The OSD function can be locked by pressing “MENU” button for more than 10 seconds.
Locked OSD function can be released by pressing “MENU” button for more than 10 seconds again.

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The OSD tree
Below is an overall view of the structure of the On-Screen Display. You can use this as a reference when you want to
work your way around the different adjustments later on.

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19” LCD Color Monitor 190B7
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3.4 Connecting to the PC
1) Connect the power cord to the back of the monitor firmly. (Philips has pre-connected) VGA cable for the first
installation.)
2) Connect to PC
(a) Turn off your computer and unplug its power cable.
(b) Connect the monitor signal cable to the video connector on the back of your computer.
(c) Plug the power cord of your computer and your monitor into a nearby outlet.
(d) Connect the PC audio cable to the audio connector on the back of your computer.
(e) USB plug
(1) Connect USB upstream port on monitor and the USB port on PC with a USB cable.
(2) The USB downstream port is now ready for any USB device to plug in.
(f) Turn on your computer and monitor. If the monitor displays an image, installation is complete.

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4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 D-SUB connector
Pin NO. Description Pin NO. Description
1. Red Video input 9. DDC +5V
2. Green Video input (SOG) 10. Logic GND
3. Blue Video input 11. Ground
4. Sense (GND) 12. Serial data line (SDA)
5. Cable Detect (GND) 13. H.sync/H + V.sync
6. Red Video Ground 14. V.Sync
7. Green Video Ground 15. Data Clock Line (SCL)
8. Blue Video Ground
VGA Connector layout
4.1.2 DVI connector
Pin No. Description Pin No. Description
1. TMDS data 2－13. No connect
2. TMDS data 2＋14. ＋5V Power
3. TMDS data 2/4 Shield 15. GND (for +5V)
4. No connect 16. Hot Plug Detect
5. No connect 17.
TMDS data 0－
6. DDC Clock 18.
TMDS data 0＋
7. DDC Data 19. TMDS data 0/5 Shield
8. No Connect 20. No connect
9. TMDS data 1－21. No connect
10. TMDS data 1＋22. TMDS Clock Shield
11. TMDS data 1/3 Shield 23. TMDS Clock +
12. No connect 24. TMDS Clock －
Digital Connector

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4.2 Factory Preset Display Modes

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4.3 Pixel Defect Policy

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5. Block Diagram
5.1 Monitor Exploded View
(1) BEZEL-DECO
(2) KEY BOARD
(3) CONTROL BUTTON
(4) BEZEL
(5) PANEL
(6) MAIN FRAME
(7) MAIN BOARD
(8) AUDIO BOARD
(9) USB BOARD
(10) SCALER SHIELDING
(11) BKT-VESA
(12) REAR COVER
(13) MID_COVER
(14) SHIELD-PWR
(15) POWER BRACKET
(16) MYLAR
(17) POWER BOARD
(18) HEING COVER BACK
(19) HINGE ASS'Y
(20) HINGE COVER FRONT
(21) BASE
(22) BASE BRACKET

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5.2 Software Flow Chart
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N
16
17
19
Y
N
18

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1) MCU Initializes.
2) Is the EEprom blank?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) SavethepowerkeystatusintoEEprom.
Turn on the LED and set it to green color. Scalar
initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the message
disappears.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

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5.3 Electrical Block Diagram
5.3.1 Main Board
EEPROM
AT24C16AN-10SU-2.7
(
U403
)
Panel Interface
(CN406)
NT68663MEFG
(Include MCU, ADC, OSD)
(
U401
)
D-Sub Connector
(CN405)
EEPROM M24C02-WMN6TP
(
U405
)
SDA
SCL RXD
TXD RGB H-SYNC
V-SYNC
DB15_SDA
DB15_SCL
Crystal 12MHz
(
X
4
01
)
Keypad Interface
(CN403)

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5.3.2 Inverter/Power Board