Dell E2209Wf User manual

Service Manual
0
Service Manual
LCD Monitor E2209Wf

1
Service Manual Versions and Revision
No.
Version
Release Date
Revision
1
1.0
2008-6-3
Initial Release
Copyright
Copyright 2007 InnoLux Display. Corp. Ltd
All Rights Reserved
This manual may not, in whole or in part, be copied, Photocopied, reproduced, translated, or converted to any
electronic or machine readable form without prior written permission of Foxconn Tech. Corp. Ltd.
Dell E2209W Service Manual

Service Manual
2
Table of Contents
CHAPTER 1- PRECAUTIONS & SAFETY NOTICES ...................................................................................................................... 3
1. SAFETY PRECAUTIONS ...................................................................................................................................................... 3
2. PRODUCT SAFETY NOTICE ............................................................................................................................................... 3
3. SERVICE NOTES ................................................................................................................................................................... 3
CHAPTER 2- SERVICE TOOLS & EQUIPMENT REQUIRED....................................................................................................... 4
CHAPTER 3- CIRCUIT THEORY ........................................................................................................................................................ 5
1. BLOCK DIAGRAM ..................................................................................................................................................................... 5
2. ELECTRONIC CIRCUIT THEORY ................................................................................................................................................ 7
3. FACTORY PRESET TIMING TABLE ................................................................................................................................. 13
4. POWER ON/OFF SEQUENCY ................................................................................................................................................... 13
5. D-SUB CONNECTOR PIN ASSIGNMENT .................................................................................................................................. 14
6. AC OUTLET PIN ASSIGNMENT ............................................................................................................................................... 14
7. INNER CONNECTOR PIN ASSIGNMENT .................................................................................................................................... 14
8. KEY PARTS PIN ASSIGNMENTS ............................................................................................................................................... 16
CHAPTER 4- DISASSEMBLY & ASSEMBLY .................................................................................................................................. 21
1. EXPLODED DIAGRAM ............................................................................................................................................................. 21
2. E2209WFPF DISASSEMBLY BLOCK ....................................................................................................................................... 22
3. ASSEMBLY BLOCK.................................................................................................................................................................. 23
CHAPTER 5- TEST AND ADJUSTMENT ......................................................................................................................................... 24
1. FUNCTION KEY DEFINITIONS .................................................................................................................................................. 24
2. OSD CONTROL....................................................................................................................................................................... 24
3. FACTORY MODE INTRODUCTION ............................................................................................................................................ 26
4. BURN-IN PATTERN .................................................................................................................................................................. 27
5. AUTO COLOR BALANCE (AUTOMATICALLY CALIBRATE CHIP ADC PARAMETER BY USING CHIP INTERNAL DAC.) ................ 27
6. UPLOAD FIRMWARE TO MCU VIA VGA CABLE...................................................................................................................... 26
7. AFTER REPAIR,TO ENSURE THE QUALITY YOU SHOULD DO THE FOLLOWING TEST AND ADJUSTMENT. ................................... 27
CHAPTER 6- TROUBLE SHOOTING ............................................................................................................................................... 30
1. COMMON ACKNOWLEDGE...................................................................................................................................................... 30
2. NO POWER LED OFF.............................................................................................................................................................. 30
3. POWER NORMAL LED AMBER................................................................................................................................................ 31
4. BACKLIGHT CAN’T BE TURNED ON ......................................................................................................................................... 32
5. NO PICTURE BACKLIGHT ON ................................................................................................................................................ 33
6. AT 32-GRAY SCALE PATTERN,COLOR LOST IN SOME SCALE .................................................................................................... 34
CHAPTER 7- RECOMMENDED PART LIST................................................................................................................................... 35
ATTACHMENT 1- BILL OF MATERIAL .......................................................................................................................................... 37
ATTACHMENT 2- SCHEMATIC ........................................................................................................................................................ 47
ATTACHMENT 3- PCB LAYOUT....................................................................................................................................................... 60

Service Manual
3
Chapter 1- PRECAUTIONS & SAFETY NOTICES
SAFETY PRECAUTIONS
This monitor is manufactured and tested on a ground principle that a user’s safety comes first.
However, improper used or installation may cause damage to the monitor as well as to the user.
WARNINGS:
This monitor should be operated only at the correct power sources indicated on the rating label on
the rear cover of the monitor. If you’re unsure the power supply in your residence, consult your
local dealer or Power Company.
Use only the specified power cord that comes with this monitor.
Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. This monitor
should only be repaired by a qualified technician.
Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock
to human bodies.
Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
Put your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your closed dealer.
Always unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth. Apply
non-ammonia based cleaner onto the cloth, not directly onto the class screen.
Do not place heavy objects on the monitor or power cord.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety visual inspections and the
protection afforded by them cannot necessarily be obtained by using replacement components rated
for higher voltage, wattage, etc. Before replacing any of these components read the parts list in this
manual carefully. The use of substitute replacement parts, which do not have the same safety
characteristics as specified in the parts list, may create shock, fire, or other hazards.
SERVICE NOTES
When replacing parts on circuit boards, clamp the solder wires around terminals before soldering.
Keep wires away from high voltage, high temperature components and sharp edges.
Keep wires in their original position so as to reduce interference.
Adjustment of this product please refers to the user’ manual.
Use Pb free solder wire for circuit board preparation.

Service Manual
4
Chapter 2- SERVICE TOOLS & EQUIPMENT REQUIRED
1. SIGNAL GENERATOR
2. MULTIMETER
3. SCREW DRIVER
4. OSCILLOSCOPE
5. Soldering IRON
6. SOLDER (Lead free, RoHS compliance)
7. Color Analyzer
8. Fox_VISP_Programmer
9. Fox_VEDID_Programmer

Service Manual
5
Chapter 3- CIRCUIT THEORY
Block Diagram
There are 3pcs PCBA in this monitor, one is power& inverter&Audio board which is a single layer board,
one is interface board including USB HUB 1up/2down, one is keypad which is OSD control, and one is
USB transfer board located on the right side back cover. The system function block diagram as below
This PWA is included switching power supplier, inverter for CCFL and interface board.(fig.1)
Fig.1
INVERTER
POWER

Service Manual
6
Fig.12

Service Manual
7
Electronic Circuit Theory
2.1 Inverter PWM circuit
2.1.1)Inverter Control circuit:(fig.2)
Fig.2
27VDC provides the power for U1; the control signals Brightness and ON/OFF come from I/F
board. ON/OFF signal connect to pin16 of U1 and makes U1 enable. Brightness signal connect to
pin12 of U1 and regulates the panel brightness, make up a network of delaying time circuit and R23
make up a divided voltage network, C3 is used to control start-up timing. The operation
frequency is determined by the external Resistor R16 and capacitor C8 connected to pin3 of U1.
C7 is used for soft start and compensation.
The output drives, include DRV1, DRV2 (pins8,9 respectively) output square pulses to drive
MOSFET Q6, Q7 and each of Q6, Q7 is consist of a N+P channel MOSFET. Q6 and Q7 work as All
Bridge structure, it is high efficient, PWM switching.
During start up, VSEN (pin1) senses the voltage at the transformer secondary. When VSEN
reaches 3.0V, the output voltage is regulated. If no current is sensed approximately 2seconds U1 shut
off.
The current flowing through CCFL is sensed and regulated through sense resistor R6, R19. The
feedback voltage connected to Pin1 (ISEN), then compared with a reference voltage (1.5V) via a
current amplifier, resulting in PWM drive outputs to All Bridge switches.
2.1.2）Protection Circuit

Service Manual
8
Over Voltage Protection and over-current protection are monitored by the voltage on VSEN(Pin
1) During normal operation , if a CCFL is damaged or removed ,the voltage at VSEN (Pin1)
increases .Once the voltage at VSEN exceeds 3.0V (OVPT Setting) the driver output duty cycle is
regulated and the shutdown delay timer is activated. OVPT set the overall protection threshold voltage
that is lower than 3V (VSEN threshold). Once the voltage at TIMER pin reached about 3v ,the IC will
shut down and latch . R3, R4,R14,R15,C1,C15,C16,C17 are connected in high voltage output
connector, the divided AC voltage is inverted DC voltage through D2, D3, R9 and C11 are used to
rectify wave & dump noise. Then the voltage signal reaches Pin1 VSEN of U1, when the voltage
changes, build-in PWM of U1 will adjust output voltage.
Open Lamp Protection: In normal operation, R10,R11 are sensed a high level DC voltage,If a
CCFL is removed or damaged during normal ,the voltage at SSTCMP(Pin2) rises rapidly .when the
voltage at SSTCMP reaches a threshold of approximately 2.0V,a current source charges the
capacitor(C3 and C18)connected to TIMER(Pin12).Once the voltage level at the TIMER pin reaches a
threshold of approximately 3.3v,The drive outputs shut down and latch .
2.2 Power PWM circuit
2.2.1) Block diagram:(fig.4)
2.2.2) AC Input and EMI Filter:(fig.5)
fig.5
CN850 is a connector for connecting AC Power. F850 is a fuse to protect all the circuit AC. Input
EMI Filter
Rectifier and
filter
Isolation power
transformer
Rectifier and filter
Inverter circuit
PWM controller
Switching element
Feedback Isolation
Rectifier and filter
Interface
circuit

Service Manual
9
voltage is from 90V to 264V. R850/R851/R852 are joined between two inputting main circuit to prevent
man from shock. L850is used to filter low frequency noise. C850 and C851 are used to discharge the
noise that L850produced. High frequency waves are damped by C852;
2.2.3)High Voltage to Low Voltage Control Circuit:(fig.6)
fig.6
D850 is a rectifier in which there are 4 build-in diodes, inverting AC to DC.
C854 is used to smooth the wave from rectifier. U850 is a highly integrated PWM controller.
Typical start-up current for U850 is only 20 uA, When current flow through R841/R842/R843 gets to
Pin 3of U850, with VDD hold-up capacitor C855, U850 is enough for starting up.
When U850 begins to operate Pin8 of U850 will output square wave to drive Q850, then the main
current flow get to GND bypassing through T850, Q850. Because of the change of current flow, wires in
the other side of T850 will induct current. In the same time, the current inducted by wires which
connected T850 Pin 1 and Pin 3, with components of D852, R856and C855 ,will be supplied to U850 for
normal operating.