Dc-Dc Converter (A15) - Philips LC4.5E Service Manual

Circuit Diagrams and PWB Layouts
DC-DC Converter
1 2
DC-DC CONVERTER
A15
SUPPLY
A
3251
1251
F251
1
1R0
2
F252 4251
3
F253 RES
4
5
NC
F254
6
F255
7
5254
8
NC
9
+9V_STBY_PDP
F257
10
11 NC
B
1252
1
2
3
for ITV only
C
+12VUNREG
D
E
3139 123 6072.1
1 2
LC4.5E AA 7.
3
I264
+8V6
5251 +12VUNREG
+12V
5252 5253
+5V
2251 2252
2254 2253
10p 10p 10u 16V
10u
16V
TO/FROM 1M20 OF HERCULES
+5V2
4255 A3
+5V2_RELAIS_IO2
(PDP) A3
2255 5257
10p
5258
(LCD)
(PDP)
(LCD)
I251
5259
(PDP)
I252
I253
6259 2262
3259 3260 2261
47u
SS14
10K 6K8 RES
5262
6262
10u
SS24 I254
2263 2264
10u
10u
SupplyGnd SupplyGnd
SupplyGnd
3
37
4 5
+12VUNREG
6270
BZX384-C8V2
F258
+12VSW
I261
3270
2K2
3271
820R
7260
LF33CPT
1 5
IN OUT
2 4
CTRL NC NC
COM
16V
I255
NC
7262 Φ
VCC VREF
L5973D
I256
1
OUT
3
INH
I257
5
FB
6267
2
NC SYNC
I258
SS36
4
COMP
GND GND_HS
SupplyGnd
2265 2266
220p 22n
I259
SupplyGnd
SupplyGnd
SupplyGnd
3266
4K7
SupplyGnd
4 5
6 7
+3V3STBY
3273 3274
220K 22K
F259
POWER_DOWN
A2
A5
7272 A7
I263
BC847BW
I262
7271
BC847BW
2271
10n
F260 +3V3STBY
5267 5268
I260
10u
33u
3267
2268 2269
16V 16V
5K6 470u 470u
1%
SupplyGnd
3268
3K3
1%
SupplyGnd
6 7
8
1251 A1
1252 B1
A15
2251 B2
2252 B3
2253 B3
2254 B3
2255 B2
2261 C4
2262 C4
2263 D3
2264 D4
A
2265 E5
2266 E6
2268 D7
2269 D7
2271 B6
3251 A2
3259 C2
3260 C3
3266 E6
3267 D6
3268 E6
3270 B6
B
3271 B6
3273 B7
3274 B7
4251 A2
4255 B2
5251 A3
5252 B3
5253 B3
5254 B2
5257 B3
5258 C3
5259 C3
C
5262 D3
5267 D6
5268 D7
6259 C3
6262 D3
6267 D6
6270 A6
7260 C5
7262 D4
7271 B7
7272 B7
D
F251 A1
F252 A1
F253 A1
F254 A1
F255 B1
F257 B1
F258 A4
F259 B7
F260 C7
I251 C3
I252 C4
I253 C4
E
I254 D3
I255 D4
I256 D5
I257 D5
I258 D5
I259 E5
I260 D7
I261 A6
I262 B6
F_15390_015.eps I263 B6
240205
I264 A2
8