LG Flatron 27UD68P Service Manual page 39

SCALAR DC-DC BLOCK
DC-JacK (Straight Type)
JK400
+19V
KJA-DC-1-0032 JP400
4
4
2
2
C409 C410
0.1uF 68uF
50V 35V
1
1
JP401
+5V_STANDBY +19V
OPT
IC400
L400 L401
MP2315GJ
R400
47K
AAM
1
IN
2
3A
SW
3
OPT
C400
C404 C407
4.7uF
4.7uF 0.1uF
GND
25V 25V 50V
4
+19V
IC401
MP2315GJ
R435
47K AAM
1
IN
2
3A
OPT
SW
C439 C440 C441 3
4.7uF 4.7uF 0.1uF
25V 25V 50V
GND
4
+19V
PANEL_ON
IC402
MP2315GJ
R401
47K AAM
1
IN
2
3A
OPT
SW
C401 C403 C406 3
4.7uF 0.1uF
4.7uF
25V 25V 50V
GND
4
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
For Jig Test
+5V_STANDBY
R402
100K
+3.3V_NORMAL
OPT
R409
10K
OPT
C411
0.1uF
50V
FB
8
VCC
L404
7 Setting: 3.37V=0.8(1+18K/5.6K)
10uH
EN/SYNC
6
R417
18K
C416
1%
BST 0.1uF
5
16V
C422 C425
R406 R410 C419
15K
100 0.1uF 10uF 10uF
R415
16V 10V 10V
51K
C412
0.1uF
50V
R418
5.6K
1%
OPT
R437
100K +5V_STANDBY
R439
100
5V_ST_ON
C445
0.1uF
FB
50V
8
VCC
7 L405
Setting: 5.06V(=0.8(1+75K/14K)
10uH
EN/SYNC
6
C443
BST
OPT R441
5 0.1uF
R438 75K
16V
15K
1%
R436
C446 C447 C448
100
0.1uF 10uF 10uF
16V 10V 10V
R440
51K
C442
0.1uF
50V
R442
14K
1%
R405
100
OPT
C414
0.1uF
16V
Setting: 10.40V(=0.8(1+120K/10K)
+10V_PANEL
FB
8
VCC
7
L403
10uH
EN/SYNC
6
C418
BST
OPT R421
5 0.1uF
R413 120K
16V
2K 1%
R408 OPT
100 C420 C424 C427
C428
0.1uF 4.7uF 4.7uF 4.7uF
R414 50V 25V 25V 25V
51K
C415
0.1uF
50V
R422
10K
1%
+5V_STANDBY
ZD400
5V
OPT
ZD405
5.6V
Power sequence Circuit for 1.8V / 1.15V
PD_CTLZ_1.15V
Q400
2N7002KA
R416
PD_CTLZ_1.8V
100
OPT
C421
0.1uF
50V
IC404
MP2315GJ
R407
47K AAM FB
1 8
IN VCC 4.7uH
2 7
3A
SW EN/SYNC
C405 C408 3 6
10uF 0.1uF
10V 50V
OPT
GND BST
C444
4 5
R443 0.1uF
16V
10K
R412 R445
100 51K
C417
0.1uF
50V
PD_CTLZ_1.15V
C426
IC405 0.1uF
16V
MP2315GJ
R411
47K AAM FB
1 8
IN VCC
2 7
3A
SW EN/SYNC
3 6
C413
C402
10uF 0.1uF
10V 50V
GND BST
C449
4 5
OPT
0.1uF
R444
16V
2K
R420
100
C423
0.1uF
50V
+3.3V_NORMAL +3.3V_NORMAL
AR400
10K
PD_CTLZ_1.8V
D D
Q402
R404
G
2N7002KA
10K
S C S
R403
1K
Q401 B
2N3904S PD_CTL
E
MAIN POWER
+1.8V_DDR
L407
20150709
R447
10K
1%
R448
C450
C452 C454
10K 0.1uF 10uF 10uF
ZD401
10V 10V
1% 16V
2.5V
R449
15K
1%
+1.15V_VDD
L408
4.7uH
20150709
R450
1.5K
1%
R451 C451
C453 C455
3.3K 0.1uF 10uF 10uF ZD404
10V
16V 10V
R446 1% 2.5V
51K
R452
10K
1%
AR401
10K
R424
G
10K
C
R423
1K
Q403 B
PD_CTL_DDR
2N3904S
E
27MU68 2015.06.23
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