Dell E2209Wf, Service Manual

  Service Manual

11 

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 (TSUMU58EHJ-LF-2) analog input PIN #28,#25,#23, and then 
TSUMU58EHJ-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 (TSUMU58EHJ-LF-2) #33. 

- Signal TTL horizontal sync. (Hsync) inputs via CN101 #13, and then clamped by ZD102 Zener, 

passes through R133, and then goes into IC U105 (TSUMU58EHJ-LF-2) #32. 

- CN101#5 is defined as cable detect pin, this detector realize via R121 and U104#36, and D102 is 

ESD protector. 

- U103 +5V is supplied by PC via CN102#9 with ZD102 for ESD protection, or supplied by Monitor 

self via D106 

- U103 is an EEPROM IC which is memory and EDID data saved in it. 

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,R207,R208 enter into U105 
(TSUMU58EHJ-LF-2) Digital input terminal #16,#15,#13,#12,#10,#9,#18,#19, and then 
TSUMU58EHJ-LF-2 deals with signal internally. D206, D207, D204, D205, D202, D203, 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, this detector realize passes through R216 ,go into U105#49, 

and D210 is ESD protector. 

- U201 +5V is supplied by PC via CN201#14 through D201, or supplied by Monitor self via D201. 
- U201 is an EEPROM IC which is memory and DVI input EDID data saved in it. 

2.3.3 Buttons Control   

- Button “Power” on front bezel connects to U105 (TSUMU58EHJ-LF-2) #4 through CN104 #8, U105 

#4 is defined as power on/off. 

- Button “+” on front bezel connects to U105 (TSUMU58EHJ-LF-2) #120 through CN104 #2, 

U105#120 Voltage is defined as “Plus”. 

- Button “-” on front bezel connects to U105 (TSUMU58EHJ-LF-2) #121 through CN104 #3, U105 

#121 Voltage is defined as “Minus”. 

- Button “Menu” on front bezel connects to U105 (TSUMU58EHJ-LF-2) #50 through CN104 #1, 

U105 #50 Voltage is defined as “Menu”. 

- Button “SELECT” on front bezel connects to U105 (TSUMU58EHJ-LF-2) #122 through CN104 #4, 

U105 #122 Voltage is defined as “SELECT”. 

- LED Indicator on Front Bezel   

a.

When press button “power”, U105 (TSUMU58EHJ-LF-2) #123 be send in low Voltage, make 

Q107#3 sends out high Voltage , and then to CN01#5 on keypad, LED green on. 

b.

When in “Suspend” mode, U105 (TSUMU58EHJ-LF-2) #124 sends out a low Voltage, make 

Q108#3 sends out high Voltage and then to CN01 #7 on keypad, LED Amber ON. 

2.3.4 MATAR CHIP U105 (TSUMU58EHJ-LF-2)

- U105 (TSUMU58EHJ-LF-2) #91~#100 output 8 bit even and #77~#86 output 8 bit odd LVDS digital 

data to panel control circuit through CN103.