Dell UltraSharp 2208WFP, Service Manual

Page: 3 / 63

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. B
LOCK
D
IAGRAM
..................................................................................................................................................................... 5
2. E
LECTRONIC
C
IRCUIT
T
HEORY
................................................................................................................................................ 7
3. FACTORY PRESET TIMING TABLE ................................................................................................................................. 13
4. P
OWER
O
N
/O
FF
S
EQUENCY
................................................................................................................................................... 13
5. D-SUB C
ONNECTOR
P
IN
A
SSIGNMENT
.................................................................................................................................. 14
6. AC O
UTLET
P
IN
A
SSIGNMENT
............................................................................................................................................... 14
7. I
NNER
C
ONNECTOR
P
IN
A
SSIGNMENT
.................................................................................................................................... 14
8. K
EY
P
ARTS
P
IN
A
SSIGNMENTS
............................................................................................................................................... 16
CHAPTER 4- DISASSEMBLY & ASSEMBLY .................................................................................................................................. 21
1. E
XPLODED
D
IAGRAM
............................................................................................................................................................. 21
2.
2208
WFP D
ISASSEMBLY
B
LOCK
............................................................................................................................................ 22
3. A
SSEMBLY
B
LOCK
.................................................................................................................................................................. 23
CHAPTER 5- TEST AND ADJUSTMENT ......................................................................................................................................... 24
1. F
UNCTION KEY
D
EFINITIONS
.................................................................................................................................................. 24
2. OSD C
ONTROL
....................................................................................................................................................................... 24
3. F
ACTORY
M
ODE
I
NTRODUCTION
............................................................................................................................................ 26
4. B
URN
-
IN PATTERN
.................................................................................................................................................................. 27
5. A
UTO
C
OLOR
B
ALANCE
(A
UTOMATICALLY CALIBRATE CHIP
ADC
PARAMETER BY USING CHIP INTERNAL
DAC.) ................ 27
6. U
PLOAD FIRMWARE TO
MCU
VIA
VGA C
ABLE
...................................................................................................................... 32
7. A
FTER REPAIR
,
TO ENSURE THE QUALITY YOU SHOULD DO THE FOLLOWING TEST AND ADJUSTMENT
. ................................... 27
CHAPTER 6- TROUBLE SHOOTING ............................................................................................................................................... 30
1. C
OMMON
A
CKNOWLEDGE
...................................................................................................................................................... 30
2. N
O
P
OWER
LED O
FF
.............................................................................................................................................................. 30
3. P
OWER NORMAL
LED A
MBER
................................................................................................................................................ 31
4. B
ACKLIGHT CAN
’
T BE TURNED ON
......................................................................................................................................... 38
5. N
O PICTURE
B
ACKLIGHT ON
................................................................................................................................................ 39
6. A
T
32-
GRAY SCALE PATTERN
,
COLOR LOST IN SOME SCALE
.................................................................................................... 40
CHAPTER 7- RECOMMENDED PART LIST................................................................................................................................... 35
ATTACHMENT 1- BILL OF MATERIAL .......................................................................................................................................... 37
ATTACHMENT 2- SCHEMATIC ........................................................................................................................................................ 47
ATTACHMENT 3- PCB LAYOUT....................................................................................................................................................... 60