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E1709W Schematic ( PDF Datasheet ) - Dell

Teilenummer E1709W
Beschreibung LCD Monitor Service Manual
Hersteller Dell
Logo Dell Logo 




Gesamt 62 Seiten
E1709W Datasheet, Funktion
Service Manual
LCD Monitor E1709W
Service Manual
-0-






E1709W Datasheet, Funktion
Chapter 3- CIRCUIT THEORY
Service Manual
Block Diagram
There are 2pcs PCBA in this monitor, one is power& inverter board which is a single layer board,
and one is interface board&keypad which is OSD control. The system function block diagram as
below
This PWA is included switching power supplier, inverter for CCFL and interface board.(fig.1)
+12V DC output
Brightness Control
ON/OFF Control
+5V DC output
+5V DC
1
Snubber
Snubber
&Schottky
&Schottky
Power
T ransforme r
Feedback
and OVP
MOSFET
INL837
Rectifier&
Filter
Circuit
Power
MOSFET
Photocoupler
2 Feedback
Control
AC Line Filter
PWM Control IC
LD7575
AC Input
90V~264V
Fig.1
5

6 Page









E1709W pdf, datenblatt
CN853
CON8PIN
Service Manual
D801
1
3
ED602
2
1
3
D802
ED602
2
R801 10R
C802 0.1/50V
R802 20R/open
R803
10K
K
I851
R
A TL431
C801
0.01/50V
R804
3K3 1%
fig.7
D801 is used to rectify the inducted current. R801 and C861 are used to store energy when
current is reversed. The parts including C864 and L852 are used to smooth the current waves that
are from D801, and then 12V voltage is supplied.
D856 is used to rectify the inducted current. R863 and C863 are used to store energy when
current is reversed. The parts including C856, C858, C876 and L851 are used to smooth the
current waves that are from D856, and then 5V voltage is supplied.
12V and 5V supply voltage feed back to PWM controller U850 via R861, R871, R804 and I850.
R803, C801 and C802 used to control respond time.
2.3 I/F Board Circuit (see the Attachment 2- Schematic)
2.3.1 RGB CAPTURE
- Signal RED,GREEN,BLUE input through CN102 #1,#2,#3, Stop DC via C113, C114 and
C115, and then enter into U105 (TSUM1PER-LF-2) analog input PIN #13,#10,#8, and then
TSUM1PER-LF-2 deals with signal internally. D103, D104, D105 are ESD protector to
prevent U105 from ESD.
- Signal DDC_SCL (series clock) inputs via CN102#15, and then passes through ZD106 for
ESD protection, goes into EDID EEPROM IC U103 #6.
- Signal DDC_SDA (series data) inputs via CN102#12, and then passes through ZD103 for
ESD protection, goes into EDID EEPROM IC U103 #5.
- Signal TTL vertical sync. (Vsync) inputs via CN102 #14, and then clamped by ZD105 Zener,
passes through R134, and then goes into IC U105 (TSUM1PER-LF-2) #17.
- Signal TTL horizontal sync. (Hsync) inputs via CN102 #13, and then clamped by ZD104
Zener, passes throughFB101 & R133, and then goes into IC U105 (TSUM1PER-LF-2) #16.
- CN102#5 is defined as cable detect pin, this detector realize via R121 and U105#64, and
D102 is ESD protector.
- U103 +5V is supplied by PC via CN102#9 with D106 and ZD102 for ESD protection, or
supplied by Monitor self via D104.
- U103 is an EEPROM IC which is memory and EDID data saved in it.
2.3.2 Buttons Control
11

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