Service Manual
18
D960 & D961, The components including C961,C962,C963,L953 and C964
are used to smooth the current waves, then DC+5V voltage is supplied.
DC 5V supply voltage feed back to PWM controller U950 via,
R964,R968,R963,C969,R965,C968 I951,R962 Used to control the voltage
feedback loop.
R970,R971,R972,R973,C891and ZD971,ZD972,ZD973, Q971 form a
combined OVP circuit.
2.2.5) Audio Power output:(fig.8)
0402
Audio_on_of f
7
0402
R937
10K
ZD930
GDZ20B 20V
R932
20K 1%
0402
0402
0402
Audio_on_off
L930
CHK-091
4
1
3
2
R936
10K
Q931
PMBT2907A
3
1
2
F853
5A/125V
R935
10K
+
C933
470u/25V
HIGH ON
I930
TL431
Audio_DET
R931
1K
R934
1M
+24V
Q932
MMBT4401
1
3
2
CN853
BNC-2
2
3
1
C935
1nF/50V X7R
Q930
AP9972
1
4
3
+
C932
470u/25V
0402
D932
1N4148
R933
10K
R938
39.2K
R939
10K
1/4W
+12V
C936
1000p/50V
Fig.8
12V audio power is come from linear voltage drop circuit , with output
on/off control circuit.
L930 use for reduce EMI conduct noise. F853 is used for OCP for the LPS test.
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) analog input
PIN #28,#25,#23, and then TSUMU58EHJ-LF 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 R116, and then goes into IC U105
Содержание 2209WA - UltraSharp - 22" LCD Monitor
Страница 1: ...Service Manual 0 Service Manual LCD Monitor 2209WA ...
Страница 25: ...Service Manual 24 8 Key Parts Pin Assignments 8 1 U105 TSUMU58EHJ LF ...
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Страница 32: ...Service Manual 31 Chapter 4 Disassembly Assembly 1 Exploded Diagram ...
Страница 36: ...Service Manual 35 Note 1 The arrows point out the direction of assembly ...
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Страница 81: ...Service Manual 80 Attachment 3 PCB Layout power inverter bd inverter board Top Layer Bottom Layer ...
Страница 82: ...Service Manual 81 Main board Top Layer ...
Страница 83: ...Service Manual 82 Bottom Layer ...
Страница 84: ...Service Manual 83 Keypad USB convert board ...
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