Dvi Capture; Buttons Control - Dell 2209WA Service Manual

Service Manual
(TSUMU58EHJ-LF) #33.
- Signal TTL horizontal sync. (Hsync) inputs via CN101 #13, and then clamped
by ZD104 Zener, passes through R115, and then goes into IC U105
(TSUMU58EHJ-LF) #32.
- CN102#5 is defined as cable detect pin ,the detect pin can create a pull-low
signal send to U105#36pin via R160 to identity cable connection, if plug out
the VGA cable the U105#36pin will receive a high signal and system enter self
test mode when exit factory mode（the device must set at VGA input mode ）.
- U103 is an EEPROM IC which is memory and EDID data saved in it,the IC
power is supplied by PC via CN102#9 with D106 and ZD102 for ESD protection,
or supplied by Monitor self via D106.

2.3.2 DVI CAPTURE

- Differential Signal input RX0+,RX0-,RX1+,RX1-,RX2+,RX2-,RXC+,RXC-
through CN201 #18,#17,#10,#9,#2,#1,#23,#24 via
R206,R205,R204,R203,R202,R201,R208,R207 enter into U105
(TSUMU58EHJ-LF) Digital input terminal #15,#16,#12,#13,#9,#10,#18,#19,
and then TSUMU58EHJ-LF-LF deals with signal internally. D202, D203,
D204, D205, D206, D207, D208, D209 are ESD protector to prevent U105
from ESD
- Signal DDC_SCL (series clock) inputs via CN201#6, and then passes through
ZD204 Zener for ESD protection, via R209, goes into EDID EEPROM IC
U201 #6.
- Signal DDC_SDA (series data) inputs via CN201#7, and then passes through
ZD203 Zener for ESD protection, via R210, goes into EDID EEPROM IC
U201 #5.
- CN201#15 is defined as cable detect pin, the detect pin can create a pull-low
signal send to U105#49pin via R216 to identity cable connection, if plug out
the DVI cable the U105#49pin will receive a high signal and system enter self
test mode when exit factory mode（the device must set at DVI input mode ）.
- U201 is an EEPROM IC which is memory and DVI input EDID data saved in
it ,the U201 power is supplied by PC via CN201#14 through D201, or supplied
by Monitor self via D201..

2.3.3 Buttons Control

- Button "Power" on right corner of front bezel connects to U105
(TSUMU58EHJ-LF ) #4 through CN104 #8 and R125, U105 #4 is defined as
power on/off.
- Button "+" on right corner of front bezel connects to U105
(TSUMU58EHJ-LF) #120 through CN104 #2and R154, U105#120 is defined
as "Plus".
- Button "-" on right corner of front bezel connects to U105 (TSUMU58EHJ-LF)
#121 through CN104 #3 and R155, U105 #121 is defined as "Minus".
- Button "Menu" on right corner of front bezel connects to U105
(TSUMU58EHJ-LF) #50 through CN104 #1and R153, U105 #50 is defined as
"Menu".
- Button "SELECT" on right corner of front bezel connects to U105
(TSUMU58EHJ-LF) #122 through CN104 #4, U105 #122 is defined as
"SELECT".
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