ViewSonic N1900w-1E Service Manual page 51

8.4. POWER DC-DC
E_PWM
P301
1 2 1 2 BACK ON/OFF
1 2
3 4
3 4
5 6
5 6
7 8
7 8
9 10
11 12 9 10
11 12
11 12
CONN FLEX 12
DC IN
pin 5,6 chang to 7,8
pin 7,8 chang to 5,6
5V_STB
Inverter Connector
R303
Q301 NC
R306 NC
ADJ_PWM R307 NC
1
B
P5 ADJ_PWM
NC
SOT 3
C
23
2
E
R308 100
ON_PBACK R309 1
P9 ON_PBACK B
SOT
3
C
NC 23
2
E
Q303
NC
R311 0
Vcc3.3for
analog
5V_STB I305 AIC1117-3.3
3 2
VIN VOUT
C320
1 4 C321
ADJ TAB
C370 0.1U
+
100uF/16V 47uF/16V
+3.3AVDD for
AVDD_DVI
+3.3AVDD AVDD_DVI
L307
200/2A
C337
C339
10uF/16V 0.1U
+3.3AVDD for
C338
VDD_MPLL
0.1U
+3.3AVDD VDD_MPLL
L312
200/2A
C364 C365
0.1U
10uF/16V
ViewSonic Corporation
5V_AMP
5V_STB
C366
+ C367
0.1U
1000uF/16V/LowESR
12VIN
R320
PW_ON
P9 PW_ON
4.7K
C368 C369
+
0.1U
5V_STB
470uF/16V/LowESR
C301
+
5V_STB 100uF/16V
R304
NC
E_PWM
R310
C312 R302 PW_ON
P9 PW_ON
NC C314
NC 4.7K
0.1U
BACK ON/OFF
C315
NC
+3.3AVDD for
AVDDA
Vcc3.3for
digital
+3.3AVDD AVDDA
L303
200/2A
0.1U
+3.3AVDD C326
4
C324
10uF/16V
C322
0.1U
+3.3V for
VDDP
+3V3
VDDP
L308
200/2A
C343
10uF/16V
C341 C344 C345 C346 C352 C353 C354
0.1U 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U
48
N1900w-1E
Confidential - Do Not Copy
12VIN
12VT_IN
I308
1 8
S D
2 7
S D
3 6 C304
S D
R318
4 5
G D
20K 0.1U
AM9435
C305
R319
750 0.1U
Q305
MMBT3904
1
B
C306
SOT 3
C
23
2
E
0.1U
5VD
I302
1 8
S D
2 7
S D
3 6 C303
S D
C302 R301
4 5
G D
0.1U
0.1U 10K AM9435
C308
R305
1K 0.1U
Q304
MMBT3904
1
B
SOT 3
C
23
2
E
5V_STB
C325 C371
0.1U 100uF/16V
I306
3
IN
+3V3
2
OUT
R314
1
ADJ
NC
C331 C332
AP1084-33
+3.3V Regulator R317 C330 +
TO-263 0.1U 0.1U
0R 47uF/16V
+1.8V for
VDDC
+1.8V VDDC
L310
200/2A
C347
47uF/16V
C348 C349 C350 C351
0.1U 0.1U 0.1U 0.1U
I304
3
OUT
4 2
ADJ
C316
1
IN
0.1U
LM7805/TO252
C317
0.1U
12VT_IN
I303
L301
3
OUT
200/2A
C311 C309
4 2
ADJ
C310
+
0.1U
1
IN
0.1U
LM7808/TO252 47uF/16V
Vcc1.8
5V_STB
I307 AP1117-1.8 SOT223 +1.8V
3 2
VIN VOUT
C323
C372
+ 1 4 C328
ADJ TAB
+
0.1U
47uF/16V R316 NC 100uF/16V
R315 0R
5V_STB
5V_STB P3,4,9,10
+5VT 5VD
5VD P8,9
L302 +5VT
+5VT P8
200/2A
5V_AMP
5V_AMP P10
8VD
8VD P8,9
AVDD_DVI
AVDD_DVI P5
8VD AVDDA
AVDDA P5
VDDP
VDDP P5
VDD_MPLL
VDD_MPLL P5
VDDC
VDDC P5
C329
0.1U