Philips 19HFL3233D/10 Service Manual page 28

EN 28 7. TPM8.2E LA
7.4.6 NVM (U409)
The system EEPROM is a 128 kB IC. It contains all system
settings.
R4225 R4225
SYS_EEPROM_WP 10K 1/16W 5% 10K 1/16W 5%
2
R4245 R4245
4K7 1/16W 5% 4K7 1/16W 5%
Figure 7-9 NVM (U409)
7.4.7 Reset (U410)
When the input voltage for the MT5366 main processor drops
below 2.9 V, a system reset will be enforced by U410.
DV33SB
+5V_STB
R4231 R4231
1.2K 1/16W 1% 1.2K 1/16W 1%
R4233 R4233
6K8 1% 6K8 1%
Figure 7-10 Reset (U410)
7.4.9 AV33 and DV33 (U702)
The circuit around U702 will provide the main 3.3 V power
supply to the SSB.
+5V_SW to DV33/AV33
1
C711 C711 C724 C724
100N 16V 100N 16V C732 C732 10uF 16V 10uF 16V
NC/22UF 16V NC/22UF 16V
2011-Jun-01
Circuit Descriptions
DV33
DV33 DV33 DV33
C4251 C4251
1UF16V 1UF16V
U409 U409
AT24C128BN-SH-T AT24C128BN-SH-T
8
VCC
7
WP
OSCL0
6
SCL
OSDA0
5
SDA VSS
Q503 Q503
BC847C BC847C
19120_215_110519.eps
R4200 R4200
NC/0R05 1/16W NC/0R05 1/16W
U410 U410
MAX809STRG MAX809STRG
3 1
VCC GND
ORESET#
R4217 R4217
100K 1/16W 5% 100K 1/16W 5%
19120_216_110519.eps
FB707 FB707
+5V_SW
220R/2000mA 220R/2000mA
U702 U702
2
TPS54319RTE TPS54319RTE
16
VIN
1
VIN
2
VIN
15
EN
6
VSNS
7
COMP
8
RT/CLK
9
SS
C733 C733
10N 50V 10N 50V
C722 C722
3300pF 50V 3300pF 50V
Figure 7-12 AV33 and DV33 (U702)
7.4.8 Audio Mute circuit
This circuit will provide a "high-to-low" pulse when the +5 V
SSB power line goes low. This will trigger the related audio
mute circuit, preventing the audio circuit making uncontrolled
sounds.
STB_PWR5V
1
A0
2
A1
3
A2
4
1
110519
R643 R643
4.7K1/16W 4.7K1/16W
2
K
D604 D604
BAS316 BAS316
110526
L702 L702
1.5UH 1.5UH
10
PH
C718 C718
11
PH
12 100N 16V 100N 16V
PH
13
BOOT
14
PWRGD
3
GND
4
GND
5
AGND
D601 D601
BAS316 BAS316
2
A K
C689 C689 C670 C670
22UF 16V 22UF 16V 22UF 16V 22UF 16V
Q601 Q601
1
BC857BW BC857BW
1
A
DV33SB
HP_SC_MUTE
Figure 7-11 Audio Mute circuit
C734 C734
R722 R722 22UF 16V 22UF 16V
300R 1/16W 1% 300R 1/16W 1%
attach
R730 R730
100K 1% 100K 1%
R729 R729
33Kohm 1/16W +/-1% 33Kohm 1/16W +/-1%
D603 D603
BAS316 BAS316
1 2
A K
D602 D602
BAS316 BAS316
1 2
A K
19120_217_110519.eps
110519
DV33 AV33
R732 R732
0R05 1/4W 0R05 1/4W
C714 C714 C716 C716
22UF 16V 22UF 16V 100N 50V 100N 50V
attach
19120_209_110518.eps
110518