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ViewSonic Corporation
Confidential - Do Not Copy
VP2650wb-1
25
R612
47
Q601
2SK3548-01SC
D
G
S
D605
LL4148
A
K
D603
LL4148
A
K
D604
LL4148
A
K
+
C611
47U 50V
1
2
+
C606
47U 50V
1
2
R623
4.7 J
ZD601
TZMC15
A
K
D608
RSX101VA-30
A
K
D609
RSX101VA-30
A
K
D610
RSX101VA-30
A
K
+
C711
470U 35V
1
2
D611
UF4007-LF
A
K
R607
68K
R617
10K J
R613
1K J
R619
18K
C613
0.1U K
C607
680P K
D703
YG865C15R
A1
J
A2
D702
YG865C15R
A1
J
A2
D701
YG865C15R
A1
J
A2
C709
1000P K
C710
1000P K
‧
IC601NCP1203P40G
HV
8
NC
7
DRV
5
VCC
6
GND
4
CS
3
FB
2
ADJ
1
E5
R603
10K
R706
10
R705
10
R609
1M F
R611
150 J
R615
0.22
IC702
KA431AZT A_NL
A
K
R
R608
1M F
C610
1000P K
C609
1000P K
R713
10K
L611
Z45/100MHZ
R614
18K
R610
18K
C716
0.1U K
IC602
PC123FY1J00F
1
2
4
3
R712
2K
T601
540UH
2
3
7
9
1
5
8
10
D602
EGP10D-LF
A
K
A11
N5
A12
D601
UF4007-LF
A
K
R714
1K J
R716
28K F
R715
2.61K F
A-5.) Buck Converter(MCU, USB, Audio, Panel Power section)
Fig.A
Fig.A
shows the typical Buck Converter circuit. Q2 s a switching device, and Q1, Q4 are the
totem pole which get enough ability to drive P-MOS. When the Gtae of Q2 is low level, Q2
turns on. At high level, Q2 turns off. The pulse waveform will appear at D-terminal of Q2. L1,
C5, C6, and D1 will transfer the pulse to stable DC level.
The feedback circuit is composed of two resistors R5 and R11, and feedback the DC level
1.25V with error signal. C8 is a compensation capacitor.
Summary of Contents for VP2650WB - 26" LCD Monitor
Page 42: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 39 Step4 Step 5 Step 6 ...
Page 43: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 40 Step 7 Step 8 Step 9 ...
Page 44: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 41 Step 10 Step 11 ...
Page 51: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 48 4 Packing procedure ...
Page 53: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 50 6 Troubleshooting Flow Chart ...
Page 54: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 51 ...
Page 55: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 52 ...
Page 56: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 53 5 Power no work troubleshooting ...
Page 57: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 54 Power no PFC troubleshooting ...
Page 58: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 55 6 Transmitter Board ...
Page 76: ...9 PCB Layout Diagrams ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 73 ...
Page 77: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 74 ...
Page 78: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 75 ...
Page 79: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 76 ...