Dell E190Sf User manual

Service Manual
- 0 -
Service Manual
LCD Monitor E190Sf

1
Service Manual Versions and Revision
No. Version Release Date Revision
1 1.0 2009/02/16 Initial Release
Copyright
Copyright 2009 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 E190Sf Service Manual

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Table of Contents
CHAPTER 1- PRECAUTIONS & SAFETY NOTICES.....................................................................................................................0 H3
1. SAFETY PRECAUTIONS .................................................................................................................................................... 1 H3
2. PRODUCT SAFETY NOTICE.............................................................................................................................................. 2 H3
3. SERVICE NOTES.................................................................................................................................................................. 3 H3
CHAPTER 2- SERVICE TOOLS & EQUIPMENT REQUIRED .....................................................................................................4 H4
CHAPTER 3- CIRCUIT THEORY ......................................................................................................................................................5 H5
1. BLOCK DIAGRAM ................................................................................................................................................................... 6 H5
2. ELECTRONIC CIRCUIT THEORY ............................................................................................................................................... 7 H5
3. FACTORY PRESET TIMING TABLE ................................................................................................................................ 8 H11
4. POWER ON/OFF SEQUENCY .................................................................................................................................................. 9 H11
5. D-SUB CONNECTOR PIN ASSIGNMENT................................................................................................................................. 12
6. AC OUTLET PIN ASSIGNMENT .............................................................................................................................................. 12
7. INNER CONNECTOR PIN ASSIGNMENT................................................................................................................................... 10 H13
8. KEY PARTS PIN ASSIGNMENTS .............................................................................................................................................. 14
CHAPTER 4- DISASSEMBLY &ASSEMBLY.................................................................................................................................11 H18
1. EXPLODED DIAGRAM ........................................................................................................................................................... 12 H18
2. E190SF DISASSEMBLY BLOCK.............................................................................................................................................. 19
3. ASSEMBLY BLOCK ................................................................................................................................................................ 20
CHAPTER 5- TESTAND ADJUSTMENT........................................................................................................................................ 21
1. FUNCTION KEY DEFINITIONS ................................................................................................................................................ 13 H21
2. OSD CONTROL ...................................................................................................................................錯誤!尚未定義書籤。
3. FACTORY MODE INTRODUCTION........................................................................................................................................... 14 H22
4. BURN-IN PATTERN................................................................................................................................................................. 15 H22
5. AUTO COLOR BALANCE (AUTOMATICALLY CALIBRATE CHIP ADC PARAMETER BY USING CHIP INTERNAL DAC.)................ 16 H22
6. EDID (REWRITE EDID DATA TO EEPROM).........................................................................................................................17 H23
7. UPLOAD FIRMWARE TO MCU VIA VGA CABLE .................................................................................................................... 18 H23
8. AFTER REPAIR,TO ENSURE THE QUALITY YOU SHOULD DO THE FOLLOWING TEST AND ADJUSTMENT. ................................... 19 H25
CHAPTER 6- TROUBLE SHOOTING..............................................................................................................................................20 H25
1. COMMON ACKNOWLEDGE .................................................................................................................................................... 21 H25
2. NO POWER &POWER LED OFF............................................................................................................................................ 22 H26
3. POWER LED AMBER............................................................................................................................................................. 23 H26
4. BACKLIGHT CAN’T BE TURNED ON ........................................................................................................................................ 27
5. NO PICTURE &BACKLIGHT ON ............................................................................................................................................. 24 H29
6. AT 32-GRAY SCALE PATTERN,COLOR LOST IN SOME SCALE ................................................................................................... 29
7. DIAGNOSTIC TEST PAT T E R N .................................................................................................................................................. 29
CHAPTER 7- RECOMMENDED PART LIST ................................................................................................................................. 32
ATTACHMENT 1- BILLOF MATERIAL......................................................................................................................................... 25 H34
ATTACHMENT 2- SCHEMATIC.......................................................................................................................................................26 H44
ATTACHMENT 3- PCB LAYOUT..................................................................................................................................................... 54

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Chapter 1- PRECAUTIONS & SAFETY NOTICES
1. 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:
zThis 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.
zUse only the specified power cord that comes with this monitor.
zDo 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.
zDo not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock
to human bodies.
zStop using the monitor if the cabinet is damaged. Have it checked by a service technician.
zPut your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable
immediately and consult your closed dealer.
zAlways 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.
zDo not place heavy objects on the monitor or power cord.
2. 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.
3. SERVICE NOTES
zWhen replacing parts on circuit boards, clamp the solder wires around terminals before soldering.
zKeep wires away from high voltage, high temperature components and sharp edges.
zKeep wires in their original position so as to reduce interference.
zAdjustment of this product please refers to the user’ manual.
zUse Pb free solder wire for circuit board preparation.

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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

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Chapter 3- CIRCUIT THEORY
1. Block Diagram
This Block is comprised of interface board and switching power supplier board which is included by
inverter for CCFL
2. Electronic Circuit Theory
2.1 Inverter PWM circuit
2.1.1 Inverter Control circuit operations:(fig.2)
Fig.2
DC_5V through R1 and C1 will provide power for U1 on the pin2(VDDA),When the voltage at VDDA
is less than ~3.4V,the IC will enter the lockout mode. The IC will resume operation when the voltage at pin
VDDA exceeds an approximate 3.8V threshold.
Pin3(SEL) used to select appropriate drive topologies,connecting pin SEL to GED shows the IC in the
Snubber
&Schottky
+5V DC output
Brightness Control
Photocoupler
To Panel CCFL
Feedback
Control
AC Input
90V~264V
Power PWM
Control IC
Power
ON/OFF Control
Rectifier&
Filter
Circuit
Lamp2 Lamp1
To IF Board
Inverter
PWM IC
Snubber
&Schottky
Feedback
Transformer
MOSFET
Power
MOSFET
+12V DC output
Inverter Transformer
AC Line Filter

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push-pull configuration..
SSTCMP(pin14) applys the soft-start function and the loop compensation funtion.C5 at SSTCMP
compensates the feedback loop and provides good transient response to load changes.
When the IC is enabled,it starts from the strinking mode and the TIMER(pin8) is activated.During lamp
ignition,if the voltage at pin SSTCMP exceeds an approximate 2.0V threshold,the drive frequency will swith
from stinking frequency to the operation frequency, The striking frequency is determined by (R4& R5)
connected to Pin 4(RT1)and Pin5(RT). The operating frequency is determined just by R4.
Applying a voltage level greater than 2V from IF BD to pin6(PWM) can enable the IC,Once the
voltage less than ~1.0V for longer than 20ms will disable the IC.
Once the lamps are ignited and the voltage at pins ISEN1(pin9),ISEN2(pin10),OLP1(pin12),and
OLP2(pin13) all exseed approximately 0.8V,the IC enters the normal operation mode and the PWM
dimming control is actived. During start up, ISEN1 (pin9and pin10) senses the voltage on the transformer
secondary. If no current is sensed approximately 2 seconds, U1 shuts off. re used to limit current. C3 is used
to dump noise.
DRV1 and DRV2 of U1 are used to drive Q1. DRV1 and DRV2 are controlled by build-in PWM IC.
Q1 is switched which has two build-in IGBTs. The working principle of circuit of T1, the same to circuit of
Power.
The voltage signal on negative pole of D1 sensed through R7/R8 comes to Pin11 of U1 VSEN (Lamp
Current Detection & Control). The CCFL current is detected through R12/R21 and reaches a regulated value.
The CCFL current detected at resistor R12/R21 is converted to a voltage level and input to the ISEN1/2
Once the CCFLs are ignited and current is sensed through resistor R12/R21, performs the loop compensation
function. The voltage at IC pin12 controls the drive duty cycle of the power MOSFETs to regulate the CCFL
current.
2.1.2 Output Circuit and Protection Circuit operations:(fig.3)
Fig.3
The transformer (T1) secondary winding leakage inductance and output capacitance(C22) forms a
lower pass filter,which converts the square-wave driving signal into a sinusoidal output voltage signal for
CCFL.
The over-voltage protection feature is implemented by using an extermal capacitor devider(C20/C21) to
sense the output voltage.The divide-down voltage signal is sent to the IC Pin11(VSEN) ,thus regulating the
output voltage at the transformer secondary.
If a CCFL is removed, fails or damaged during normal operation, CCFL current is no longer sensed and
the voltage on ISEN1/ISEN2 drops. Once the voltage at the ISEN1/ISEN2 pin is less than the lamp” on”
threshold, the shutdown timer is activated. The IC maintains the output voltage for approximately
2-3seconds and once the timer reaches a threshold of approximately 3V, the IC will shutdown. To restart the
IC, either toggle the SST_CMP pin or recycle the power on the VDDA pin.

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2.2 Power PWM circuit operations
2.2.1) Block diagram:(fig.4)
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
voltage is from 90V to 264V. R850 and R851 are joined between two inputting main circuit to prevent
man from shock. L850 is used to filter low frequency noise. C850 and C851 are used to discharge the
noise that L850 produced. High frequency waves are damped by C852 .
EMI Filter Rectifier and
filter
Isolation power
transformer
Rectifier and filter
Inverter circuit
PWM controller Switching element
Feedback Isolation
Rectifier and filter
To IF connector

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2.2.3)High Voltage to Low Voltage Control Circuit:(fig.6)
L854
bead
C861
3300p/250V
.
.
.
T851
SPW-XXX
5
8
6
7
3
1
12
11
9
10
+
C854
100u/450V
+
C855
10u/50V
R853
0.2R
R869
0R68 2W
ZD881
OPEN
.
.
.
T850
SPW-119
5
8
6
7
3
1
12
11
9
10
Si g nal _GND
Q850
AP2764
2
13
D853
TVS-P6KE170A
C875
4700p/250V
CN852
CON8PIN
1
2
3
4
5
6
7
8
Gate
Isense
GND
FB
GND
VDD
NC
Vin
R880
82K 2W
D851
FR10-10-LF
Si g nal _GND
C860 OPEN
Signal_GND
I850
LTV817M
3
14
2
R855
10K
-+
D850
BL4-06
3
1
2
4
D852
SF10-04
Signal _GND
C872
100P/1KV
R856
10 1%
R849
220R
R848 20R
R842
20K
C847
Open
C849
1nF/50V NPO
Si g nal _GND
C848
100nF/50VX
C846
220pF/50V NPO D849
NC
Si g nal _GND
R846
100K/ 1%
CN852
CON8 PIN
1
8
3
4
5
6
7
2
Gate
HV
GND
FB
GND
VDD
NC
Isense
Signal_GND
R841
NC
Sig nal _GND
R843
20K
R847
NC
Sig nal _GND
Si g nal _GND
U850
LD7575
1
45
2
83
7
6
RT
GNDOUT
COMP
HVI sense
NC
Vcc
Fig.6

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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. R852 is a fuse resistor to protect the following circuit
when inrush current is too large.
U850 is a current-mode PWM controller with excellent power-saving opration,It features a
high-voltage current source to directly supply the startup current from bulk capacitor and further to provide
lossless startup circuit. Max start-up current for U850 is 100 uA, When current flow from the bulk
capacitor C854 through R843 and R842 gets to HV pin to start up U850, Meanwhile,the VCC supply
current is as low as 100 uA thus most of the HV current is utilized to change the VCC capacitor C855,
Whenever the Vcc voltage is higher than UVLO (16V),the GATE pin will output signal to drive the power
MOSFET(Q850), the high-voltage current source is off and the supply current is provided from the
auxiliary winding of the trasformer PIN5.
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, R856 and C855 ,will be supplied to U850 for normal
operating.
The typical current mode PWM controller feedbacks both current signal and voltage signal to close the
control loop and achieve ragulation.U850 detects the Q850 current from Isense pin which max voltage is
set as 0.85V, then the Q850 current can be calculated as:I peak=0.85V/R869,When the sense voltage
across the sense resistor R869, reaches the threshold voltage over 0.85V, the output GATE drive will be
turned off. R849 and C846 is used to avoid the Isen pin damaged by the negative turn-on spike.
The voltage feedback signal is provided from the TL431(I851) through the I850 to the COMP pin.When
the voltage on COMP pin is lower than 1.2V,the IC will turn off.
When Q850 is turned off, the main current flow will be consumed through D851, C875, R880, this will
prevent Q850 from being damaged under large current impulse and voltage spike.
RT pin is to program the switching frequency ,by connecting R846 to ground to set the switching frequency,f
=(65.0/R846)*100(KHz).
2.2.4) DC 12V and DC 5V Output Circuit and Feedback circuit:(fig.7)
+5V
DIM/ON/OFF
C871
0.1/50V
Q890
2N7000/NC
G
DS
R871
270k
C890
0.1uF/50V/NC
R891
10K/NC
R867
270
+
C863
470u/25V
F85 1
5A/125V
R899 OPEN
+
C899
OPEN
+
C869
470u/25V
L851
CHK- 0 53
CN851
SIP-8P
6
1
2
5
3
4
7
8
+5V
+5V
GND
GND
DIM
ENA
PID
P-saving _on/off
Q851
2N4401/NC
E
B
C
C866
1000p/1KV
+12V
C876
0.1/50V
R866
10R 2W
L852
CHK - 05 3
I851
TL431
3
1
2
R862
10R 2W
R860
3K3 1%
R861
3K65 1%
D856 SR5-10
+
C868
470u/25V
R859
10K 1%
R858
5K1 1%
D855
NC/SF5-20
R886
10K/NC
C862
1000p/1KV
D854
SF5-20
D857 SR5-10
+
C867
470u/25V
C859
0.01/50V
R890
9.1K/NC
R887
10K/NC
+
C864
470u/25V
PID
R888
510R 2W/NC
ZD880
GDZ14B/NC
Fig.7

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D854 is used to rectify the inducted current. R862 and C861 are used to store energy when current is
reversed. The parts including C862, C865 and L852 are used to smooth the current waves that are from
D855, then 13V voltage is supplied.
D856 and D857 are SCHTKY diodes used to rectify the inducted current.C866 and R866 are used to
store energy when current is reversed,The components including C864,C874,C875,L851 and C876 are
used to smooth the current waves,then DC+5V voltage is supplied. F851 is used for OCP for the LPS test.
DC 5V supply voltage feed back to PWM controller U850 via R861,R860,R859,C859,I851,R857,
R863 used to control the voltage feedback loop.
2.3 I/F Board Circuit
2.3.1 RGB CAPTURE
- Signal RED,GREEN,BLUE input through CN301 #1,#2,#3, Stop DC via C303, C302 and C301, and
then enter into U401 (gm2621-LF) analog input terminal #99,#96,#93, and then gm2621-LF deals
with signal internally. D303, D302, D301 are ESD protector to prevent U401 from ESD.
- Signal DDC_SCL (series clock) inputs via CN301#15, and then passes through ZD305 for ESD
protection, goes into EDID EEPROM IC U301 #6.
- Signal DDC_SDA (series data) inputs via CN301#12, and then passes through ZD306 for ESD
protection, goes into EDID EEPROM IC U301 #5.
- Signal TTL vertical sync. (Vsync) inputs via CN301 #14, and then clamped by ZD302 Zener, passes
through R311, and then goes into IC U401 (gm2621-LF) #90.
- Signal TTL horizontal sync. (Hsync) inputs via CN301 #13, and then clamped by ZD303 Zener,
passes through R310, and then goes into IC U401 (gm2621-LF) #89.
- CN301#5 is defined as cable detect pin, this detector realize via R319 and U401#114, and ZD301 is
ESD protector.
- U301 +3.3V is supplied by PC via CN301#9 or supplied by Monitor self via D307 with D306 and
ZD304 for ESD protection,.
- U301 is an EEPROM IC which is memory and EDID data saved in it.
2.3.2 Buttons Control
- Button “Power” on front bezel connects to U401 (gm2621-LF) #125 through CN401 #8, U401 #125
is defined as power on/off.
- Button “+” on front bezel connects to U401 (gm2621-LF) #124 through CN401 #3, U401 #124 is
defined as “Plus”.
- Button “-” on front bezel connects to U401 (gm2621-LF) #123 through CN401 #2, U401 #123 is
defined as “Minus”.
- Button “Menu” on front bezel connects to U401 (gm2621-LF) #122 through CN401 #1, U401 #122 is
defined as “Menu”.
- LED Indicator on Front Bezel
a.When press button “power”, U401(Scalar) #125 be send in low potential, make U401#57 sends out
high potential, and then to J1#2 on keypad, LED Green on.
b. When in “Suspend” mode, U401 (Scalar) #56 sends out a high potential, and then to J1 #3 on
keypad, LED Amber ON.
2.3.3 ST CHIP U401 (gm2621-LF)
- U401 (gm2621-LF) #7~#10 output 8 bit even and #31~#40 output 8 bit odd LVDS digital data to
panel control circuit through CN501.
- U401 (gm2621-LF) #127 output PPWR ”H” potential to make Q502 conducted, and then make Q501
conducted, +5V flow to CN501#1~#3 as Panel Vdd .
- U401 (gm2621-LF) #49 output CCFL_ON/OFF ”H” potential to control Inverter on/off.
- U401 (gm2621-LF) #50 outputs Brightness “PWM” signals to control CCFL brightness.
- TCLK by Crystal 14.318MHz input to U401 (gm2621-LF) #109.
- U401 (gm2621-LF) #111 Bidirectional RESET signals
Please refer to gm2621-LF Pin Assignments table in page
2.3.4 Regulator Circuit

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- +5V is from switching mode power supply for panel and Regulater U601
- +3.3V generates from Regulater U601 supply for U401, U301, U402 used.
- +1.8V generates from Regulater U602 through C603, C604 filtering which is output +1.8V for U401
used.
3. FACTORY PRESET TIMINGTABLE
Standard Resolution Horizontal Frequency
(KHz) Vertical Frequency (Hz)
640 x 480 31.469 59.940
640 x 480 37.500 75.000
800 x 600 37.879 60.317
800 x 600 46.875 75.000
1024 x 768 48.363 60.004
1024 x 768 60.023 75.029
1152x864 67.500 75.000
1280x1024 48.483 60.042
VESA
1280x1024 60.087 75.034
IBM DOS 720 x 400 31.469 70.087
4. Power On/Off Sequency
Hardware Power ON
When power cord plug into AC socket, Power provides 12V,&DC_5V from through U850, DC_3.3V be
generated from DC_3.3V Regulater U601.DC_5V is voltage for panel, DC_3.3v is main voltage for
U401. When DC_3.3V input to U401, U401 reset circuit active, set U401 all registers to default,. That
means finish hardware power on.
Software Power ON/OFF
When press power key, U401 #125 recieves low pulse, and then (gm2621-LF) U401 will be wake up and
send high plus(at 127,49pin) to on CCFL and switch 5.0v to panel module. And make the VGA cable input
signal source display normal on panel.
-If Power ON, U402 #57 (LED_Green) will send out High potential, and then LED green on.
-If Power OFF, U402 #56 (LED_Amber) will send out High potential, and then LED Amber on.
The Panel_Vcc, Backlight_En, CLK/DATA output to panel will follow the following sequency.

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Power supply for VDD
90% 90%
10%
0V 10%
T1 T2
T5 T6
T7
Signals Validdata
(Digital RGB, HS, VS, DE, CLOCK)
0V
T3 T4
Power supply for back light
T1(ms) T2 (ms) T3 (ms) T4 (ms) T5 (ms) T6 (ms) T7(ms)
SPEC(LGD) 0.5~10 0.001~50 >200 >200 0.001~50 >500
SPEC(HSD) 0.5~10 0~50 >200 >200 0.0~50 >500
5. D-SUB Connector Pin Assignment
6. AC Outlet Pin Assignment
Pin Symbol Pin Symbol Pin Symbol
1 Red 6 Red_GND 11 GND
2 Green 7 Green_GND 12 DDC_SDA
3 Blue 8 Blue_GND 13 Hsync
4 GND 9 PC+5V 14 Vsync
5 Cable Detect 10 GND 15 DDC_SCL
Pin Symbol Description
1 Line
2 GND
3 Neutral
CN850
1 3
2

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7. Inner Connector Pin Assignment
7.1 CN501 (Connect M/B to Panel, C11330MGHR0 or compatible connector)
Pin Symbol Description
1 Panel_Vcc Panel power supply (typ.5.0V)
2 Panel_Vcc Panel power supply (typ. 5.0V)
3 Panel_Vcc Panel power supply (typ. 5.0V)
4 NC
5 NC
6 NC
7 GND_LVDS LVDS Ground
8 RXE3+ LVDS signal of even channel 3(-)
9 RXE3- LVDS signal of even channel 3(+)
10 RXEC+ LVDS signal of even channel clock (+)
11 RXEC- LVDS signal of even channel clock (-)
12 RXE2+ LVDS signal of even channel 2(+)
13 RXE2- LVDS signal of even channel 2(-)
14 GND_LVDS LVDS Ground
15 RXE1+ LVDS signal of even channel 1(+)
16 RXE1- LVDS signal of even channel 1(-)
17 GND_LVDS LVDS Ground
18 RXE0+ LVDS signal of odd channel 0(+)
19 RXE0- LVDS signal of odd channel 0(-)
20 RXO3+ LVDS signal of odd channel 3(+)
21 RXO3- LVDS signal of odd channel 3(-)
22 RXOC+ LVDS signal of even channel clock (+)
23 RXOC- LVDS signal of even channel clock (-)
24 GND_LVDS LVDS Ground
25 RXO2+ LVDS signal of even channel 2(+)
26 RXO2- LVDS signal of even channel 2(-)
27 RXO1+ LVDS signal of even channel 1(+)
28 RXO1- LVDS signal of even channel 1(-)
29 RXO0+ LVDS signal of odd channel 0(+)
30 RXO0- LVDS signal of odd channel 0(-)
7.2 CN1, CN2 (Connect to Panel Backlight, SM02B-BHSS-1-TB or compatible connector)
Pin Symbol Description
1 HV High voltage for lamp
2 LV Low voltage for lamp
7.3 CN401 (Connect to keypad, SZ7103016B or compatible connector)
Pin Symbol Description
1 MENU OSD “MENU” control
2 DOWN OSD “-” control
3 UP OSD “+” control and auto adjustment control
4 GND Ground
5 GND Ground
6 LED_Green LED Green on/off control
7 LED_Amber LED amber on/off control
8 Power Power on/off control

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8. Key Parts Pin Assignments
8.1 U401 (gm2621-LF) I/O Legend: P=Power, G=Ground, O=Output, I=Input,A=Analog
Pin Symbol I/O Description
1 AVSS_BIAS G Analog ground for LVDS PLL and Bandgap
2 VDD_OUT_33 P Digital 3.3V supply for LVDS output
3 RESERVED O Reserved; Do not connect
4 RESERVED O Reserved; Do not connect
5 RESERVED O Reserved; Do not connect
6 RESERVED O Reserved; Do not connect
7 E_CH3P_LV O LVDS signal of even channel 3(+)
8 E_CH3N_LV O LVDS signal of even channel 3(-)
9 E_CLKP_LV O LVDS signal of even channel clock (+)
10 E_CLKN_LV O LVDS signal of even channel clock (-)
11 E_CH2P_LV O LVDS signal of even channel 2(+)
12 E_CH2N_LV O LVDS signal of even channel 2(-)
13 E_CH1P_LV O LVDS signal of even channel 1(+)
14 E_CH1N_LV O LVDS signal of even channel 1(-)
15 E_CH0P_LV O LVDS signal of even channel 0(-)
16 E_CH0N_LV O LVDS signal of even channel 0(-)
17 CVDD_18 P Core VDD connect to digital 1.8V
18 CRVSS O Chip digital ground
19 RESERVED O Reserved; Do not connect
20 RESERVED O Reserved; Do not connect
21 RESERVED O Reserved; Do not connect
22 RESERVED O Reserved; Do not connect
23 RESERVED O Reserved; Do not connect
24 RESERVED O Reserved; Do not connect
25 Vdd_out_33 P Digital 3.3V supply for LVDS output
26 VSS_OUT G Digital ground for LVDS output
27 RESERVED O Reserved; Do not connect
28 RESERVED O Reserved; Do not connect
29 RESERVED O Reserved; Do not connect
30 RESERVED O Reserved; Do not connect
31 O_CH3P_LV O LVDS odd channel 3 positive. Reserved for gm5611 and gm2621
32 O_CH3N_LV O LVDS odd channel 3 negative. Reserved for gm5611 and
gm2621
33 O_CLKP_LV O LVDS odd channel clock positive. Reserved for gm5611 and
gm2621
34 O_CLKN_LV O LVDS odd channel clock negative. Reserved for gm5611 and
gm2621
35 O_CH2P_LV O LVDS odd channel 2 positive. Reserved for gm5611 and gm2621
36 O_CH2N_LV O LVDS odd channel 2 negative. Reserved for gm5611 and
gm2621
37 O_CH1P_LV O LVDS odd channel 1 positive. Reserved for gm5611 and gm2621
38 O_CH1N_LV O LVDS odd channel 1 negative. Reserved for gm5611 and
gm2621
39 O_CH0P_LV O LVDS odd channel 0 positive. Reserved for gm5611 and gm2621
40 O_CH0N_LV O LVDS odd channel 0 negative. Reserved for gm5611 and
gm2621
41 RESERVED O Reserved; Do not connect
42 RESERVED O Reserved; Do not connect
43 RESERVED O Reserved; Do not connect

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44 RESERVED O Reserved; Do not connect
45 RESERVED O Reserved; Do not connect
46 RESERVED O Reserved; Do not connect
47 VDD_OUT_33 P Digital 3.3V supply for LVDS output
48 VSS_OUT G Digital ground for LVDS output
49 PBIAS O Panel backlight enable
50 PWM0/GPO_4 I/O PWM0 output or optional general-purpose output GPO_4.
Also used for bootstrap control
51 GPIO_0 I/O General-purpose output GPO_0. Also used for bootstrap control
52 CRVSS G Chip digital ground
53 RVDD_33V P Digital Output VDD. Connect to digital 3.3V
54 CRVSS G Chip digital ground
55 CVDD_18 P Core VDD connect to digital 1.8V
56 GPIO_1 I/O General-purpose output GPO_1. Also used for bootstrap control
57 GPIO_2 I/O General-purpose output GPO_2. Also used for bootstrap control
58 GPIO_3 I/O General-purpose output GPO_3. Also used for bootstrap control
59 SPI_CSn I/O SPI ROM chip select. Also used for bootstrap control.
60 SPI_CLK I/O SPI ROM Clock output.
61 SPI_DI I/O SPI ROM Data input. Connect this pin to the data output of
Serial FLASH
62 SPI_DO I/O SPI ROM Data input. Connect this pin to the data input of Serial
FLASH
63 RVDD_33V P Chip digital ground
64 DDC_SCL_VGA I DDC2Bi clock for Analog Port
65 DDC_SDA_VGA I/O DDC2Bi clock for Analog Port, internal pull up of 10K ohms
66 DDC_SCL_DVI/
HOST_SCA
I DDC2Bi clock for DVI Port or host I2C clock signal for
debugging
67 DDC_SDL_DVI/
HOST_SDA
I/O DDC2Bi clock for DVI Port or host I2C data signal for
debugging, internal pull up of 10k ohms
68 AVSS_DVI G Analog GND for DVI input. Reserved for gm2621 and gm2621;
Do not connect
69 REXT I External reference resistor.
A 1%, 250Ωresistor should be connected from this pin to pin 74.
Reserved for gm2621 and gm2621; Do not connect.
70 AVDD_DVI_18 P Analog VDD (1.8V) for DVI input.
Must be bypassed with external capacitor(s) to AVSS_DVI.
Reserved for gm2621 and gm2621; Do not connect.
71 AVSS_DVI G Analog GND for DVI input. Reserved for gm2621 and gm2621;
Do not connect.
72 RX2+ I Do not connect.
73 RX2- I Do not connect.
74 AVDD_DVI_33 P Analog VDD (3.3V) for DVI input. Reserved for gm2621 and
gm2621; Do not connect.
75 RX1+ I Do not connect.
76 RX1- I Do not connect.
77 AVSS_DVI G Analog GND for DVI input. Reserved for gm2621 and gm2621;
Do not connect.
78 AVDD_DVI_18 P Analog VDD (1.8V) for DVI input.
Must be bypassed with external capacitor(s) to AVSS_DVI.
Reserved for gm2621 and gm2621; Do not connect.
79 AVSS_DVI G Analog GND for DVI input. Reserved for gm2621 and gm2621;
Do not connect.
80 RX0+ I Do not connect.

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81 RX0- I Do not connect.
82 AVDD_DVI_33 P Analog VDD (3.3V) for DVI input. Reserved for gm2621 and
gm2621; Do not connect.
83 RXC+ I Do not connect.
84 RXC- I Do not connect.
85 AVSS_DVI G Analog GND for DVI input. Reserved for gm2621 and gm2621;
Do not connect.
86 AVDD_DVI_18 P Analog VDD (1.8V) for DVI input.
Must be bypassed with external capacitor(s) to AVSS_DVI.
Reserved for gm2621 and gm2621; Do not connect.
87 CVDD_18 P Core VDD connect to digital 1.8V
88 CRVSS G Chip digital ground
89 HSYNC I ADC input horizontal sync or composite sync input.
90 VSYNC I ADC input vertical sync
91 RVDD_33V P Digital Output VDD. Connect to digital 3.3V
92 AVDD_ADC_33 I 1.8V for gmZAN3SL core
93 BLUE+ I Positive analog input for Blue channel
94 BLUE- I Negative analog input for Blue channel
95 AVSS_ADC G Analog ground for ADC
96 GREEN+ I Positive analog input for Green channel
97 GREEN- I Negative analog input for Green channel
98 AVSS_ADC G Analog ground for ADC
99 RED+ I Positive analog input for Red channel
100 RED- I Negative analog input for Red channel
101 AVDD_ADC_33 P Analog power (3.3V) for ADC. Must be bypassed with capacitor
to AVSS_ADC pin.
102 AVSS_ADC G Analog ground for ADC
103 AVSS_ADC G Analog ground for ADC
104 AVDD_ADC_18 P Analog power (1.8V) for ADC. Must be bypassed with capacitor
to AVSS_ADC pin.
105 VBUFC_RPLL O Reserved; Do not connect
106 VDD_RPLL_18 P Digital 1.8V Power for PLL
107 VSS_RPLL G Ground for PLL
108 XTAL O Connect to 14.3MHz crystal. Should be bypassed with capacitor
to AVDD_RPLL_33.
109 TCLK I Connect to 14.3MHz crystal. Should be bypassed with capacitor
to AVDD_RPLL_33.
110 AVDD_RPLL_33 P Analog power (3.3V) for PLL
111 RESETn I/O Bypass with 0.01uF capacitor GND
112 LBADC_VSS G Ground for general-purpose LBADC
113 LBADC_IN3 I Ground-purpose LBADC input 3.
114 LBADC_IN2 I Ground-purpose LBADC input 2.
115 LBADC_IN1 I Ground-purpose LBADC input 1.
116 LBADC_VDD_33 P 3.3V supply for general-purpose LBADC.
117 CRVSS G Chip digital ground
118 CVDD_18 P Core VDD connect to digital 1.8V
119 PWM0/GPO_5 I/O PWM0 output or optional general-purpose output GPO_5.
Also used for bootstrap control
120 GPIO_8 I/O General-purpose input/output 8
121 GPIO_9 I/O General-purpose input/output 9
122 GPIO_10 I/O General-purpose input/output 10
123 GPIO_11 I/O General-purpose input/output 11
124 GPIO_12 I/O General-purpose input/output 12

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125 GPIO_13 I/O General-purpose input/output 13
126 GPIO_14 I/O General-purpose input/output 14
127 PPWR O Panel power enable
128 AVDD_BIAS_33 P Analog 3.3V supply for LVDS PLL and Bandgap
8.2 U402 (Serial Flash)
Pin Symbol I/O Description
1 CE# I The device is enabled by a high to low transition on CE#. CE#
must remain low for the duration of any command sequence.
2 SO I/O To transfer commands, addresses, or data serially into the device.
3 WP# I/O The write protect (WP#) pin is used to enable/disable BPL bit in
the status register.
4 VSS G Connect ground
5 SI I/O To transfer commands, addresses, or data serially into the device
input are latched on the rising edge of the serial clock.
6 SCK I/O To provide the timing of serial interface.
Commands, addresses, or input data are latched on the rising
edge of the clock input, while output data is shifted out on the
Falling edge of the clock input.
7 HOLD I/O To temporarily stop serial communication with SPI flash
memory without resetting the device.
8 VDD P To provide power supply.
8.3 U850 (LD7575, Power Controller)
Pin Symbol I/O Description
1 RT This pin is to program the switching frequency
2 COMP I Voltage feedback pin,By connecting a photo-coupler
to close the control loop and achieve the regulation
3 CS I Current sence pin
4 GND
5 OUT O PWM output ,Gate drive output to drive the external
MOSFET
6 VCC I Power supply
7 NC Unconnected pin
8 HV I PWM output
8.4 U1 ( INL816GN, CCFL Inverter controller IC)
Pin Symbol I/O Description
1 DRV1 O Driver output 1
2 VDDA --- Supply voltage input
3 SEL I Select Signal for Push-Pull or Half-Bridge Topology
4 RT1 I/O Timing Resistor for Striking Frequency
5 RT I/O Timing Resistor for Operation Frequency
6 ENAPWM I Enable and PWM Dimming input
7 PID I Analog Dimming input
8 TIMER I/O Timing Capacitor for Delay Timer
9 ISEN1 I Currentfeedback1
10 ISEN2 I Currentfeedback2
11 VSEN I Voltage Feedback
12 OLP1 I Open-Lamp Protection Sense1
13 OLP2 I Open-Lamp Protection Sense2
14 SSTCMP I/O Soft-Start and Compensation
15 GNDA --- Ground
16 DRV2 O Driver output 2

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Chapter 4- Disassembly &Assembly
1. Exploded Diagram

Service Manual
19
2. E198FPf Disassembly Block
bezel assy 1PC
LOGO 1PC
front-bezel
1PC
key button 1PC
release-metal-button
1pc
vesa-release-button
1pc
stand assy 1pc
release button assy
1pc
chassis 1pc
chassis assy 1pc
slide 1pc
fix-plate1 1pc
fix-plate2 1pc
spring 2pc
screw,F(90度),cross,
M3*4,Zn-Cc 2pcs
SHIELD EMI
LP2207,6pcs
top-mylar 1pc
panel 1pc
screw,I,M3*4,Zn-Cc 4pcs(HSD PANEL)
screw,I,M3*5,Zn-Cc 4pcs(LGD PANEL)
DELL E190Sf DISASSEMBLY BLOCK
Rubber
10x20x3.8mm
2pcs
bottom-mylar 1pc
LVDS cable 1pc
TAPE ACE 85X45mm
keypad PCB 1PC
SCREW,I,CROSS,T.T-2*2.5,
Zn,ROHS, 2PCS
PCBA,P/I board,LE1966-7B0 1pc
screw,p,cross,
W/WAS,M3*8,Zn-Cc 2PCS
screw,B,cross,
W/W(T),M4*6,Zn-Cc 1PC
PCBA,I/F board,LE1966-8B0 1pc
screw,p,cross,
W/WAS,M3*8,Zn-Cc 2PCS
BOLT,#4-40*12.5,Ni 2pcs
screw,I,M3*6,Zn-Cc 2PCS
back-cover assy 1pc
back-cover 1pc
kensing-ton 1pc
SCREW,BPT3.0x4,C3UC
ROHS, 2PCS
screw,P,cross,
M4*10,blk-NYLOK,
4pcs