Service Manual
11
I851
TL431
K
R
A
D802
ED602
1
2
3
D801
ED602
1
2
3
C801
0.01/50V
R804
3K3 1%
R803
10K
C802 0.1/50V
R801 10R
CN853
CON8PIN
4
5
6
3
1
7
8
2
Snubber
C431
Ref
Cathode
Anode
GND
GND
NA
R802 20R/open
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
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